Climate and monthly weather forecast
Boise, ID

The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho

Weather in January

January, the same as December, is another cold winter month in Boise, Idaho, with an average temperature varying between 35.2°F (1.8°C) and 23.4°F (-4.8°C). In Boise, the average high-temperature in January is almost the same as in December - a still wintry 35.2°F (1.8°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Boise, Idaho, with temperature in the range of an average high of 39.9°F (4.4°C) and an average low of 27.7°F (-2.4°C). In Boise, the average high-temperature in February is essentially the same as in January - a still wintry 39.9°F (4.4°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Boise, Idaho, with an average temperature fluctuating between 48.9°F (9.4°C) and 34.3°F (1.3°C). In Boise, Idaho, the average high-temperature in March rises from a cold 39.9°F (4.4°C) in February to a chilly 48.9°F (9.4°C). Weather in March »

Weather in April

April in Boise, Idaho, is a moderate spring month, with an average temperature fluctuating between 56.7°F (13.7°C) and 38.1°F (3.4°C). In Boise, the average high-temperature in April marginally rises from a frosty 48.9°F (9.4°C) in March to a mild 56.7°F (13.7°C). Weather in April »

Weather in May

May, the last month of the spring in Boise, is an enjoyable month, with an average temperature fluctuating between 67.1°F (19.5°C) and 45.1°F (7.3°C). In May, the average high-temperature rises from a mild 56.7°F (13.7°C) in April to an enjoyable 67.1°F (19.5°C). Weather in May »

Weather in June

June, the first month of the summer in Boise, is a moderately hot month, with an average temperature varying between 52.7°F (11.5°C) and 75.7°F (24.3°C). In June, the average high-temperature slightly increases from an enjoyable 67.1°F (19.5°C) in May to a warm 75.7°F (24.3°C). Weather in June »

Weather in July

July is a hot summer month in Boise, Idaho, with an average temperature fluctuating between 87.8°F (31°C) and 60.6°F (15.9°C). July is the warmest month, with an average high-temperature of 87.8°F (31°C) and an average low-temperature of 60.6°F (15.9°C). Weather in July »

Weather in August

The last month of the summer, August, is also a hot month in Boise, Idaho, with an average temperature fluctuating between 86.5°F (30.3°C) and 61.3°F (16.3°C). In August, the average high-temperature is practically the same as in July - a still tropical 86.5°F (30.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Boise, Idaho, with an average temperature varying between 76.1°F (24.5°C) and 53.6°F (12°C). In Boise, the average high-temperature in September drops from a hot 86.5°F (30.3°C) in August to a moderately hot 76.1°F (24.5°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Boise, Idaho, with temperature in the range of an average high of 59°F (15°C) and an average low of 42.1°F (5.6°C). In Boise, the average high-temperature in October significantly decreases from a warm 76.1°F (24.5°C) in September to a moderate 59°F (15°C). Weather in October »

Weather in November

November, the last month of the autumn in Boise, is also a frosty month, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 32°F (0°C). In Boise, Idaho, the average high-temperature in November drops from a moderate 59°F (15°C) in October to a chilly 45.5°F (7.5°C). Weather in November »

Weather in December

December, the first month of the winter in Boise, is also a wintry month, with an average temperature fluctuating between 34.7°F (1.5°C) and 23.2°F (-4.9°C). December is the coldest month, with an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 23.2°F (-4.9°C). Weather in December »
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FAQ

What is the most humid month in Boise?

The most humid month is January, with an average relative humidity of 80%.

How many days 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 in Boise?

January through April, November and December are months with snowfall in Boise, Idaho.

How much does it snow in Boise?

Throughout the year, in Boise, Idaho, there are 31.4 snowfall days, and 21.3" (541mm) of snow is accumulated.

When is the lowest UV index in Boise?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Boise, Idaho.

What is the rainiest month in Boise?

The month with the most rainfall in Boise is March, when the rain falls for 16.2 days and typically aggregates up to 2.2" (56mm) of precipitation.

When is Daylight Saving Time (DST) in Boise?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Boise, Idaho, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow in Boise?

In Boise, Idaho, snow does not fall in May through October.

When are the longest days in Boise?

The month with the longest days is June, with an average of 15h and 23min of daylight.

What is the warmest month in Boise?

July is the warmest month, with an average high-temperature of 87.8°F (31°C) and an average low-temperature of 60.6°F (15.9°C).

What is the least humid month in Boise?

With an average relative humidity of 30%, July is the least humid month in Boise.

What is the driest month in Boise?

July is the month with the least rainfall. Rain falls for 4.5 days and accumulates 0.2" (5mm) of precipitation.

What month has the most sunshine in Boise?

With an average of 12.1h of sunshine, July has the most sunshine of the year in Boise, Idaho.

What is the month with the highest UV index in Boise?

The month with the highest UV index is July, with an average maximum UV index of 7.

What is the coldest month in Boise?

December is the coldest month in Boise, Idaho, with an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 23.2°F (-4.9°C).

What is the snowiest month in Boise?

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 in Boise?

The month with the shortest days in Boise, Idaho, is December, with an average of 9h and 0min of daylight.

What is the month with the least sunshine in Boise?

With an average of 5.5h of sunshine, December has the least sunshine of the year in Boise.

Average temperature
Boise, ID

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).

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Average pressure
Boise, ID

Average pressure - Boise, ID

The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
Boise, ID

Average wind speed - Boise, ID

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).

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Average rainfall
Boise, ID

Average rainfall - Boise, ID

The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days
Boise, ID

Average rainfall days - Boise, ID

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).

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Average snowfall
Boise, ID

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").

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Average snowfall days
Boise, ID

Average snowfall days - Boise, ID

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).

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Average daylight / Average sunshine
Boise, ID

Average daylight / Average sunshine - Boise, ID

The month with the longest days is June (Average daylight: 15h and 23min).
The month with the shortest days is December (Average daylight: 9h and 0min).

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).

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Average sunshine days
Boise, ID

Average sunshine days - Boise, ID

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

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Average visibility
Boise, ID

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).

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