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Contents
- The climate of Hermiston
- The best time to visit Hermiston
- The worst time to visit Hermiston
- Spring weather in Hermiston
- Summer weather in Hermiston
- Autumn weather in Hermiston
- Winter weather in Hermiston
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Hermiston
Hermiston, Oregon belongs to the Mid-latitude steppe, a designation of the Köppen climate classification system indicating a semi-arid climate. This geographical location offers mild and moderately dry atmospheric conditions throughout the year.
When examining the climate data presented for Hermiston, it is evident that temperature fluctuations occur distinctively across different seasons. High temperatures take a journey from a chilly 39.9°F (4.4°C) in January, slowly elevating to a peak at 88°F (31.1°C) in July, before descending back to 38.8°F (3.8°C) by December. Parallel to this, low temperatures also show a similar pattern starting at 29.7°F (-1.3°C) in January, climbing to 64°F (17.8°C) in August and dropping back to 28.6°F (-1.9°C) by year's end.
Relative humidity undergoes significant decrease from February to July and starts increasing again from August to January, with lowest of 36% in July and August, and highest of 79% in January. Rainfall does not show a drastic pattern change throughout the year, but lowest precipitation records from 0.16" (4mm) in July and higlight occurse from 0.98" (25mm) in January and February to 1.06" (27mm) in March and December. Days of snowfall are predominantly confined to the winter months with up to 1.3" (33mm) in December.
When examining the climate data presented for Hermiston, it is evident that temperature fluctuations occur distinctively across different seasons. High temperatures take a journey from a chilly 39.9°F (4.4°C) in January, slowly elevating to a peak at 88°F (31.1°C) in July, before descending back to 38.8°F (3.8°C) by December. Parallel to this, low temperatures also show a similar pattern starting at 29.7°F (-1.3°C) in January, climbing to 64°F (17.8°C) in August and dropping back to 28.6°F (-1.9°C) by year's end.
Relative humidity undergoes significant decrease from February to July and starts increasing again from August to January, with lowest of 36% in July and August, and highest of 79% in January. Rainfall does not show a drastic pattern change throughout the year, but lowest precipitation records from 0.16" (4mm) in July and higlight occurse from 0.98" (25mm) in January and February to 1.06" (27mm) in March and December. Days of snowfall are predominantly confined to the winter months with up to 1.3" (33mm) in December.
The best time to visit Hermiston
The apt time to visit Hermiston primarily depends on the preferred weather conditions of the visitors. However, with climatic statistics in hand, it stands to reason that the best time to visit Hermiston would be during the late spring to early summer, specifically from May to June. During this time, the average high temperatures range from a comfortable 71.2°F (21.8°C) to 78.1°F (25.6°C) while the low temperatures range between 49.6°F (9.8°C) and 55.8°F (13.2°C) respectively. This period also sees a decrease in humidity levels and relatively low rainfall, with precipitation levels of 0.67" (17mm) and 0.51" (13mm).
The worst time to visit Hermiston
Visitors are likely to find the cold and damp conditions from December to February potentially challenging. Temperatures during this period remain low with average highs from 39.9°F (4.4°C) to 45°F (7.2°C) and dipping lows from 28.6°F (-1.9°C) to 32.5°F (0.3°C). Additionally, humidity increases up to 77% to 79% and the rainfall peaks to 0.98" (25mm) to 1.06" (27mm), making the weather fairly inhospitable for outdoor activities.
Spring weather in Hermiston
Spring blossoms around March in Hermiston, bringing milder temperatures and declining humidity levels. The high temperatures shift from 53.2°F (11.8°C) in March to 71.2°F (21.8°C) in May, with corresponding low temperatures of 37.9°F (3.3°C) to 49.6°F (9.8°C). Rainfall happens moderately, fluctuating between 1.06" (27mm) in March to 0.67" (17mm) in May.
Summer weather in Hermiston
Hermiston experiences the peak of summer from June to August with high temperatures shooting up to between 78.1°F (25.6°C) in June and 88°F (31.1°C) in July. The low temperatures remain pleasant at an average from 55.8°F (13.2°C) to 64°F (17.8°C). The rainfall stays minimal during this period, making Hermiston’s summer a prime time for outdoor activities.
Autumn weather in Hermiston
The fresh and mild autumn starts in September, presenting gradually decreasing temperatures from 76.1°F (24.5°C) to 48.7°F (9.3°C) by November. Relatedly, the low temperatures also drop from 57°F (13.9°C) to 36.9°F (2.7°C). Autumn sees moderate rainfall levels with 0.31" (8mm) in September increasing to 0.67" (17mm) in November.
Winter weather in Hermiston
The chilly winters grip Hermiston from December, bringing along an upsurge in rainfall and humidity. The winter high temperatures range from 48.7°F (9.3°C) in November to 38.8°F (3.8°C) in December while the low temperatures drop from 36.9°F (2.7°C) to 28.6°F (-1.9°C). Snowfall, though not heavy, becomes a frequent winter characteristic with up to 1.3" (33mm) in December.
Weather in January
The start of the year in Hermiston, Oregon, witnesses a generally cold and wet weather pattern. Despite the chill, January presents an interesting mix of winter conditions with the high relative humidity of 79%. One unique aspect of January is the presence of snowfall, amounting to 1.06" (27mm) over an average of 2.5 days. Weather in January »
Weather in February
In February, the weather in Hermiston, Oregon, remains on the colder side, continuing its winter run from January. Though the temperature escalates a few degrees from the previous month, it still captures snowfall. The month records the highest snowfall amount of the year, hitting a peak of 2.72" (69mm) across an average of 3.4 days. Weather in February »
Weather in March
March brings the onset of the spring season in Hermiston, Oregon. Shaking off the biting cold of winter, the weather warms considerably with a decrease in snowfall quantities. Daylight hours extend, and sunshine permeates the skies more frequently, signaling the retreat of the winter chill. Weather in March »
Weather in April
April sees a pronounced shift in the Hermiston, Oregon, weather as the spring season fully unfolds. As the weather turns warmer, the last vestiges of winter snowfall disappear entirely. The month revels in an increasing amount of sunshine and extended daylight hours, making it an inviting time for outdoor activities. Weather in April »
Weather in May
The beaming rays of May in Hermiston, Oregon, lay embeddings of the impending summer. As temperatures climb steadily, both the humidity and cloud percentage have a marked decrease. These transitions compose a setting well-suited for daytime outdoor activities, with ample sunshine and bright, clear skies. Weather in May »
Weather in June
June in Hermiston, Oregon, marks the onset of summer with temperatures continuing their upward trend from the previous month. The city witnesses the beauty of clear blue skies as cloud percentage dwindles, reaching its lowest in the year. Weather in June »
Weather in July
July’s scorching sun firmly establishes summer in Hermiston, Oregon. Temperatures during this month peak for the year, touching a blazing 88°F (31.1°C) - a significant escalation from June. July marks the zenith of outdoor festivity, imbued with a characteristic summer vibe. Weather in July »
Weather in August
The summer season persists in Hermiston, Oregon, in August with slightly vibrant, less harsh weather conditions compared to July. There's a slight decrease in temperature from its annual peak in the previous month, but summer heat still dominates. Weather in August »
Weather in September
September marks the transition from a hot, blazing summer to the milder weather of autumn in Hermiston, Oregon. Gradual variations in the weather patterns commence with a notable reduction in daytime temperatures. There's a distinctive coolness that starts to lace the air, especially in the evenings. Weather in September »
Weather in October
October witnesses Hermiston, Oregon, in the full swing of autumn. The weather becomes considerably colder compared to September, as the city prepares for the winter season that lies ahead. This is a time of year when nature puts on a dramatic performance, with vivid fall colors reaching their apex. Weather in October »
Weather in November
November ushers in the chill of late-autumn in Hermiston, Oregon. With the temperatures spiraling down from October, signs of an approaching winter begin to manifest. Intermittent rainfall persists, augmenting the chilly late-autumn atmosphere. Weather in November »
Weather in December
In December, winter reigns supreme in Hermiston, Oregon. The city immerses in a cold spell, with average temperatures plummeting down to the lower end of the scale. Embodying the epitome of a northern winter's charm, light snowfall visiting the city adds to the magical holiday vibes. Weather in December »
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the most humid month?
The most humid month is January, with an average relative humidity of 79%.
How many days does it rain?
In Hermiston, during the entire year, the rain falls for 109.3 days and collects up to 8.11" (206mm) of precipitation.
When does it snow?
January through March, September, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 12 snowfall days, and 6.06" (154mm) of snow is accumulated.
What is the month with the least sunshine?
The months with the least sunshine are January and December, with an average of 5.5h of sunshine.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 3.4 days and accumulates 2.72" (69mm) of snow.
What is the rainiest month?
The months with the most rainfall are March and December, with an average 1.06" (27mm) of precipitation.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
When it does not snow?
April through August and October are months without snowfall in Hermiston.
When are the longest days?
The month with the longest days is June, with an average of 15h and 42min of daylight.
What is the warmest month?
July is the warmest month, exhibiting average temperatures of 88°F (31.1°C) at the peak and 62.8°F (17.1°C) at the base.
What are the least humid months?
The months with the lowest humidity are July and August, with an average relative humidity of 36%.
What is the driest month?
The month with the least rainfall is July, when the rain falls for 3.8 days and typically collects 0.16" (4mm) of precipitation.
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 7.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 12.1h of sunshine.
What are the coldest months?
During the coldest month in Hermiston, December, temperatures average a high of 38.8°F (3.8°C) and a low of 28.6°F (-1.9°C).
What is the month with the shortest days?
With an average of 8h and 42min of daylight, December has the shortest days of the year.
Average temperature
Hermiston, OR
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is December (38.8°F).
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure
Hermiston, OR
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Hermiston, OR
- Average wind speed in January:
6.3mph - Average wind speed in February:
7.3mph - Average wind speed in March:
8.4mph - Average wind speed in April:
9.2mph - Average wind speed in May:
8.2mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
7.8mph - Average wind speed in August:
7.3mph - Average wind speed in September:
7.1mph - Average wind speed in October:
6.9mph - Average wind speed in November:
7.1mph - Average wind speed in December:
6.1mph
The windiest month (with the highest average wind speed) is April (9.2mph).
The calmest month (with the lowest average wind speed) is December (6.1mph).
Average humidity
Hermiston, OR
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall
Hermiston, OR
- Average rainfall in January:
0.98" - Average rainfall in February:
0.98" - Average rainfall in March:
1.06" - Average rainfall in April:
0.67" - Average rainfall in May:
0.67" - Average rainfall in June:
0.51"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.28" - Average rainfall in September:
0.31" - Average rainfall in October:
0.75" - Average rainfall in November:
0.67" - Average rainfall in December:
1.06"
The wettest months (with the highest rainfall) are March and December (1.06").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Hermiston, OR
- Average rainfall days in January:
11.1 days - Average rainfall days in February:
10.4 days - Average rainfall days in March:
14.5 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
9.1 days - Average rainfall days in June:
6.8 days
- Average rainfall days in July:
3.8 days - Average rainfall days in August:
3.3 days - Average rainfall days in September:
5.1 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
11.9 days - Average rainfall days in December:
12.1 days
The month with the highest number of rainy days is March (14.5 days).
The month with the least rainy days is August (3.3 days).
Average snowfall
Hermiston, OR
The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days
Hermiston, OR
- Average snowfall days in January:
2.5 days - Average snowfall days in February:
3.4 days - Average snowfall days in March:
1.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is December (3.7 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight / Average sunshine
Hermiston, OR
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
5h and 3min - Average sunshine in February:
5h and 4min - Average sunshine in March:
7h and 4min - Average sunshine in April:
10h and 1min - Average sunshine in May:
11h and 1min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 1min - Average sunshine in September:
10h and 4min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 2min - Average sunshine in December:
5h and 3min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days
Hermiston, OR
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
13.3 days - Average sunshine days in March:
13.9 days - Average sunshine days in April:
16.8 days - Average sunshine days in May:
19.7 days - Average sunshine days in June:
21.7 days
- Average sunshine days in July:
25.5 days - Average sunshine days in August:
25.2 days - Average sunshine days in September:
23.2 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
16.5 days - Average sunshine days in December:
16 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (13.3 days).
Average UV index
Hermiston, OR
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Hermiston, OR
The months with the most cloud cover are January and December (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Hermiston, OR
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Hermiston, Oregon, USA
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