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Contents
- The climate of Boise
- The best time to visit Boise
- The worst time to visit Boise
- Spring weather in Boise
- Summer weather in Boise
- Autumn weather in Boise
- Winter weather in Boise
- 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 golden fall season in Boise, Idaho
The climate of Boise
Boise, Idaho, USA, experiences a prominent Mediterranean warm-summer climate, labelled as Csb under the Köppen climate classification. Sitting along the river and foothills, the geographical position of Boise contributes to a moderate climate with four distinct seasons throughout the year.
A fluctuation in weather parameters is observed, where temperatures rise from January's 23.4°F (-4.8°C) to July's 87.8°F (31°C), indicating a diverse range of warmth. On the contrary, the temperatures dip towards December, cracking the mid-thirties. Accumulated snowfall, peaking to 6.65" (169mm) in December, and the substantial drop in daylight hours to 9 hours in December, confirm the arrival of winter.
Relatively high humidity is observed in January, at 80%, reducing to 30% by the heat of July. Rainfall reaches a zenith in March with 2.2" (56mm), progressively descending to 0.2" (5mm) in July. The lowest humidity and rainfall notably correlate to the most extensive sunlight experienced, amounting to a generous 12.1 hours per day in July. Moreover, the significant increase in UV index during summer is notable, peaking at 7 in July from a humble 2 at the beginning of the year.
A fluctuation in weather parameters is observed, where temperatures rise from January's 23.4°F (-4.8°C) to July's 87.8°F (31°C), indicating a diverse range of warmth. On the contrary, the temperatures dip towards December, cracking the mid-thirties. Accumulated snowfall, peaking to 6.65" (169mm) in December, and the substantial drop in daylight hours to 9 hours in December, confirm the arrival of winter.
Relatively high humidity is observed in January, at 80%, reducing to 30% by the heat of July. Rainfall reaches a zenith in March with 2.2" (56mm), progressively descending to 0.2" (5mm) in July. The lowest humidity and rainfall notably correlate to the most extensive sunlight experienced, amounting to a generous 12.1 hours per day in July. Moreover, the significant increase in UV index during summer is notable, peaking at 7 in July from a humble 2 at the beginning of the year.
The best time to visit Boise
Tourists looking to relish the warm, bright, and dry summer may consider visiting Boise from June to August. During these months, temperatures climb up to the mid-seventies°F, ushering in a pleasant climate suitable for outdoor activities. This period acquaints one with Boise's longest hours of daylight, spanning nearly 15 to 15.4 hours in June and July, with almost no snowfall. Further, the UV index hovers around 6-7, suggesting a need for sunscreen, hats, and comfortable clothing.
The worst time to visit Boise
The period between December and February could be deemed unfavorable for travel. As cold winters grip Boise, temperatures plunge to the twenties°F, experiencing a spike in snowfall, particularly 6.65" (169mm) in December. Daylight hours are at their lowermost during these months, roughly 9-10 hours per day, translating to shorter excursion times. Travel preparations would have to consider heavy clothing and gear suitable for snowy weather conditions.
Spring weather in Boise
In Boise, the onset of spring from March to May carries with it an increase in temperatures, from 48.9°F (9.4°C) in March to 67.1°F (19.5°C) in May. Rainfall and humidity levels fall between medium to high, peaking in March at 2.2" (56mm) and 68% respectively. Frequencies of rainfall lower in May, with an average of 1.46" (37mm) spread over 11 days. Longer daylight amongst blooming flora makes the city picturesque during this period.
Summer weather in Boise
Summers in Boise, from June to August, are characterized by high temperatures often above 75.7°F (24.3°C). A significant drop in rainfall and humidity levels is observed, reaching a yearly minimum of 0.2" (5mm) and 30%, respectively, in July. This period is known for extended daylight hours, rising to a high of 15.4 hours in June. Visitors can enjoy the warm months under clear, cloud-free skies, as cloud cover falls considerably, reaching the lowest value of 8% in July.
Autumn weather in Boise
Autumn months from September to November mark a gradual decrease in temperature, with September seeing an appreciable dip to 76.1°F (24.5°C) from summers high. Rainfall begins to increase and reaches 1.18" (30mm) in November. Humidity rises as July’s dry air recedes, and by November, it tallies up to 65%. Daylight hours decrease over these months, dipping to 9.7 hours by November, signaling the onset of Winter.
Winter weather in Boise
Boise's winter, stretching from December to February, witnesses the year's coldest temperatures, dropping to 23.2°F (-4.9°C) in both January and February. A drastic increase in snowfall occurs, peaking at 6.65" (169mm) in December, with snowfall days reaching a high of 9.2 days. While daylight hours remain low, typically around 9 to 10 hours, the sun's appearance is less frequent and shorter compared to other months. Despite the cold weather, persons appreciative of snow-filled landscapes might find this time enticing.
Weather in January
Boise, Idaho, starts the year quite chilly. Winter is at its prime, the sky is mostly cloudy which makes days shorter with just about nine hours of daylight. The inclement weather can make visibility slightly challenging which being at 5 miles due to icy or foggy conditions while UV index remains quite low at this time. Weather in January »
Weather in February
As Boise, Idaho moves towards welcoming spring, slight changes in the weather begin. The city begins to see a decent increase in daylight hours and gradually the temperatures begin to rise. With a decline in snowfall, rainfall slightly dominates the overall precipitation. Weather in February »
Weather in March
With March, Boise, Idaho, witnesses the spring effect. Rainfall still rules, overshadowing snowfall considerably. Noticeably, the days start to feel longer with increased sunshine and longer daylight hours. A noticeable warming can be felt as temperatures continue to increase, but these changes are gradual and do not trigger an abrupt change in the weather. Weather in March »
Weather in April
April in Boise, Idaho, brings a more pronounced spring climate. Precipitation shifts entirely from snow to rain as the season moves forward. Sunshine duration surpasses rainfall days, providing more clear and sunny days. The UV index begins to escalate but remains within fairly tolerable limits. Weather in April »
Weather in May
May marks the end of spring and the beginning of the summer in Boise, Idaho. The rise in temperatures becomes more evident with a marked increase in sunshine hours. While the season remains predominantly dry, occasional showers add a refreshing touch to the weather. Weather in May »
Weather in June
Entering summer, June experiences warm and dry weather in Boise, Idaho. The rise in temperatures is often balanced out by a marked decrease in relative humidity. Having the highest daylight duration, the city enjoys around 15.4 hours of sun. Weather in June »
Weather in July
July brings the heatwave to Boise, Idaho, with peak summer temperatures. Although it's the dry season, occasional thunderstorms can bring a rapid change in the weather. Despite being the hottest month, the comfortable wind speed makes the searing heat bearable during the day. Weather in July »
Weather in August
August sees the last phase of summer in Boise, Idaho. Despite lingering heat, slow but gradual temperature declines commence. The daylight duration decreases slightly while relative humidity doesn’t see a significant change. With increased cloud cover, the sunshine duration reduces, yet the heat continues to sustain due to lower precipitation. Weather in August »
Weather in September
September in Boise, Idaho, brings a transitional phase: summer’s end and autumn's start. The falling temperatures are evident while the humidity begins to creep up. The sky becomes less clear with increased cloud cover leading to a reduction in sunshine hours. Weather in September »
Weather in October
October brings distinct autumn vibes to Boise, Idaho. Temperatures continue to drop steadily, creating an invigorating atmosphere in the city as tree leaves take on beautiful fall colors. Cloud cover and humidity continue to increase while daylight hours become noticeably shorter. Weather in October »
Weather in November
November in Boise, Idaho, is the peak of fall, with temperatures continuing to plummet. The city begins to prepare for winter as the dry, sunny days give way to colder, rain-dominated weather. Snowfall makes its initial appearance of the season, although rainfall shares equal prominence. Weather in November »
Weather in December
The month of December introduces Boise, Idaho, to winter. Snowfall sees a significant boost, dominating overall precipitation. Falling temperatures, shorter daylight hours, and increased cloud cover underscore the typical winter environment. 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?
January is the most humid month, with an average relative humidity of 80%.
How much does it rain in Boise?
In Boise, during the entire year, the rain falls for 116.8 days and collects up to 15.08" (383mm) of precipitation.
When does it snow?
January through April, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 31.4 snowfall days, and 21.3" (541mm) of snow is accumulated.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the rainiest month?
March is the month with the most rainfall. Rain falls for 16.2 days and accumulates 2.2" (56mm) of precipitation.
When is Daylight Saving Time (DST) in Boise?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
When it does not snow in Boise?
May through October are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 24min of daylight.
What is the warmest month?
July is the warmest month, exhibiting average temperatures of 87.8°F (31°C) at the peak and 60.6°F (15.9°C) at the base.
What is the least humid month?
With an average relative humidity of 30%, July is the least humid month.
What is the driest month?
The month with the least rainfall is July, when the rain falls for 4.5 days and typically collects 0.2" (5mm) of precipitation.
What month has the most sunshine?
The month with the most sunshine is July, with an average of 12.1h of sunshine.
When is the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 7.
What is the coldest time of year?
Boise's December weather, marked by an average high temperature of 34.7°F (1.5°C) and an average low temperature of 23.2°F (-4.9°C), is the coldest in the year.
What is the snowiest month?
December is the month with the most snowfall. Snow falls for 9.2 days and accumulates 6.65" (169mm) of snow.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 0min of daylight.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 5.5h of sunshine.
Average temperature
Boise, ID
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).
Average pressure
Boise, ID
- Average pressure in January:
30.25"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.22"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Boise, ID
- Average wind speed in January:
5.2mph - Average wind speed in February:
6.1mph - Average wind speed in March:
6.9mph - Average wind speed in April:
7.1mph - Average wind speed in May:
6.3mph - Average wind speed in June:
6mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.4mph - Average wind speed in September:
5.4mph - Average wind speed in October:
5.5mph - Average wind speed in November:
5.9mph - Average wind speed in December:
5.8mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).
Average humidity
Boise, ID
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).
Average rainfall
Boise, ID
- Average rainfall in January:
2.05" - Average rainfall in February:
1.93" - Average rainfall in March:
2.2" - Average rainfall in April:
1.3" - Average rainfall in May:
1.46" - Average rainfall in June:
1.02"
- Average rainfall in July:
0.2" - Average rainfall in August:
0.24" - Average rainfall in September:
0.39" - Average rainfall in October:
1.02" - Average rainfall in November:
1.18" - Average rainfall in December:
2.09"
The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days
Boise, ID
- Average rainfall days in January:
10.5 days - Average rainfall days in February:
11.7 days - Average rainfall days in March:
16.2 days - Average rainfall days in April:
13.9 days - Average rainfall days in May:
11.1 days - Average rainfall days in June:
8.6 days
- Average rainfall days in July:
4.5 days - Average rainfall days in August:
4.9 days - Average rainfall days in September:
6.7 days - Average rainfall days in October:
8.7 days - Average rainfall days in November:
9.6 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).
Average snowfall
Boise, ID
The month with the highest snowfall is December (6.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Boise, ID
- Average snowfall days in January:
8.2 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.1 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0.1 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 days - Average snowfall days in October:
0.2 days - Average snowfall days in November:
3.4 days - Average snowfall days in December:
9.2 days
The month with the highest number of snowfall days is December (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Boise, ID
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
5h and 4min - Average sunshine in February:
7h and 3min - Average sunshine in March:
7h and 5min - Average sunshine in April:
9h and 3min - Average sunshine in May:
10h and 5min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
11h and 2min - Average sunshine in September:
9h and 3min - Average sunshine in October:
7h and 5min - Average sunshine in November:
6h and 2min - Average sunshine in December:
5h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days
Boise, ID
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
12.7 days - Average sunshine days in March:
12.1 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
19.4 days
- Average sunshine days in July:
23.6 days - Average sunshine days in August:
21.7 days - Average sunshine days in September:
21.5 days - Average sunshine days in October:
20.1 days - Average sunshine days in November:
16.7 days - Average sunshine days in December:
15.2 days
The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).
Average UV index
Boise, ID
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
Boise, ID
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility
Boise, ID
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).
Boise, Idaho, USA
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