Climate and monthly weather forecast
Pomona, WA

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Weather in January

January, like December, in Pomona, Washington, is another cold winter month, with an average temperature fluctuating between 25.5°F (-3.6°C) and 36.1°F (2.3°C). Pomona records an average high-temperature of a still cold 36.1°F (2.3°C) in January, closely mirroring the climate of the previous month. Weather in January »

Weather in February

The last month of the winter, February, is also an icy month in Pomona, Washington, with an average temperature ranging between min 28°F (-2.2°C) and max 40.6°F (4.8°C). The shift to February signals an average high-temperature of a still icy 40.6°F (4.8°C), subtly varied from January's 36.1°F (2.3°C). Weather in February »

Weather in March

March, the first month of the spring in Pomona, is a frosty month, with an average temperature ranging between min 33.4°F (0.8°C) and max 48.6°F (9.2°C). March showcases a minor temperature ascent, adjusting from February's icy 40.6°F (4.8°C) to a frosty 48.6°F (9.2°C). Weather in March »

Weather in April

April is a mild spring month in Pomona, Washington, with an average temperature ranging between min 38.7°F (3.7°C) and max 57.4°F (14.1°C). A subtle rise in the average high-temperature is observed during April, adjusting from a frosty 48.6°F (9.2°C) in March to a mild 57.4°F (14.1°C). Weather in April »

Weather in May

May, the last month of the spring in Pomona, is an enjoyable month, with an average temperature ranging between min 46.2°F (7.9°C) and max 67.8°F (19.9°C). May's arrival sees a rise in the average high-temperature, jumping from April's mild 57.4°F (14.1°C) to a comfortable 67.8°F (19.9°C). Weather in May »

Weather in June

June, the first month of the summer in Pomona, is a warm month, with temperature in the range of an average low of 51.3°F (10.7°C) and an average high of 74.8°F (23.8°C). As June arrives, Pomona's weather shows a minor increase in high-temperatures, edging from May's enjoyable 67.8°F (19.9°C) to a warm 74.8°F (23.8°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Pomona, Washington, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 57.7°F (14.3°C). July's arrival brings a temperature shift, moving from a moderately hot 74.8°F (23.8°C) in June to a still warm 84.7°F (29.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Pomona, Washington, with temperature in the range of an average low of 58.8°F (14.9°C) and an average high of 85.1°F (29.5°C). August is the month when Pomona, Washington, sees the highest average temperatures, with a high of 85.1°F (29.5°C) and a low of 58.8°F (14.9°C). August's mean heat index is evaluated at 84.2°F (29°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Pomona, Washington, with an average temperature ranging between min 51.8°F (11°C) and max 74.1°F (23.4°C). September implies a gentle temperature shift, with average high-temperatures reducing from August's moderately hot 85.1°F (29.5°C) to a still warm 74.1°F (23.4°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Pomona, Washington, with an average temperature varying between 41.7°F (5.4°C) and 59.2°F (15.1°C). October is marked by a distinct decrease in the average high-temperature, falling from a moderately hot 74.1°F (23.4°C) in September to a mild 59.2°F (15.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Pomona, Washington, with an average temperature fluctuating between 32°F (0°C) and 45.5°F (7.5°C). In November, the average high-temperature decreases from a moderate 59.2°F (15.1°C) in October to a frosty 45.5°F (7.5°C). Weather in November »

Weather in December

December, the first month of the winter in Pomona, is also an icy month, with temperature in the range of an average high of 36°F (2.2°C) and an average low of 23.9°F (-4.5°C). Pomona experiences its lowest average temperatures in December, reaching a peak of 36°F (2.2°C) and a minimum of 23.9°F (-4.5°C). Weather in December »

Frequently asked questions

What is the most humid month?

With an average relative humidity of 83%, January is the most humid month.

How many days does it rain?

Throughout the year, there are 87.6 rainfall days, and 5.94" (151mm) of precipitation is accumulated.

When does it snow?

January through April, September, November and December are months with snowfall.

How many days does it snow?

Throughout the year, there are 19.9 snowfall days, and 8.62" (219mm) of snow is accumulated.

What is the month with the least sunshine?

With an average of 5.5h of sunshine, January has the least sunshine of the year.

What is the month 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.

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?

May through August and October are months without snowfall.

When are the longest days?

The month with the longest days is June, with an average of 15h and 48min of daylight.

What are the least humid months?

July and August, with an average relative humidity of 41%, are the least humid months in Pomona, Washington.

What is the driest month?

July is the month with the least rainfall. Rain falls for 2.3 days and accumulates 0.08" (2mm) of precipitation.

What is the month with the most sunshine?

The months with the most sunshine are July and August, with an average of 12.1h of sunshine.

When is the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 6.

What is the hottest time of year?

August, marked by an average high-temperature of 85.1°F (29.5°C) and a low-temperature of 58.8°F (14.9°C), is the warmest month.

What time of the year is the coldest?

Pomona witnesses the coldest weather in December, with temperatures averaging a high of 36°F (2.2°C) and a low of 23.9°F (-4.5°C).

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 9.2 days and typically aggregates up to 0.87" (22mm) of precipitation.

What is the snowiest month?

December is the month with the most snowfall. Snow falls for 5.7 days and accumulates 3.07" (78mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year in Pomona, with an average of 8h and 36min of daylight.

Average temperature
Pomona, WA

Average temperature - Pomona, WA

The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (36°F).

The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).

Average pressure
Pomona, WA

Average pressure - Pomona, WA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed
Pomona, WA

Average wind speed - Pomona, WA

The windiest month (with the highest average wind speed) is June (7.4mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).

Average humidity
Pomona, WA

Average humidity - Pomona, WA

The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (41%).

Average rainfall
Pomona, WA

Average rainfall - Pomona, WA

The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is July (0.08").

Average rainfall days
Pomona, WA

Average rainfall days - Pomona, WA

The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is July (2.3 days).

Average snowfall
Pomona, WA

Average snowfall - Pomona, WA

The month with the highest snowfall is December (3.07").
The months with the least snowfall are May, June, July, August and October (0").

Average snowfall days
Pomona, WA

Average snowfall days - Pomona, WA

The month with the highest number of snowfall days is December (5.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

Average daylight / Average sunshine
Pomona, WA

Average daylight / Average sunshine - Pomona, WA

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).

Average sunshine days
Pomona, WA

Average sunshine days - Pomona, WA

The month with the most sunshine days is July (27.6 days).
The month with the least sunshine days is February (15.5 days).

Average UV index
Pomona, WA

Average UV index - Pomona, WA

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average visibility
Pomona, WA

Average visibility - Pomona, WA

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Pomona, Washington, USA

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