Monthly weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho
January, the same as December, is a wintry winter month in Boise, Idaho, with temperature in the range of an average low of 23.4°F (-4.8°C) and an average high of 35.2°F (1.8°C). In January, the average high-temperature is relatively the same as in December - a still cold 35.2°F (1.8°C). Weather in January »

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

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

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

The last month of the spring, May, is a comfortable month in Boise, Idaho, with average temperature ranging between min 45.1°F (7.3°C) and max 67.1°F (19.5°C). In May, the average high-temperature rises, from a moderate 56.7°F (13.7°C) in April, to a comfortable 67.1°F (19.5°C). Weather in May »

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

July is a tropical summer month in Boise, Idaho, with average temperature varying between 60.6°F (15.9°C) and 87.8°F (31°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 »

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

The first month of the autumn, September, is still a warm month in Boise, Idaho, with average temperature ranging between max 76.1°F (24.5°C) and min 53.6°F (12°C). In September, the average high-temperature 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 »

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

The last month of the autumn, November, is another chilly month in Boise, Idaho, 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 November, the average high-temperature decreases, from a moderate 59°F (15°C) in October, to a frosty 45.5°F (7.5°C). Weather in November »

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

What is the most humid month in Boise?

With an average relative humidity of 80%, January is the most humid month in Boise, Idaho.

How many days does it rain in Boise?

Throughout the year, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.

When does it snow in Boise?

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

How many days does it snow in Boise?

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

When is the lowest UV index in Boise?

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

What is the rainiest month in Boise?

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

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 in Boise is June, with an average of 15.4h of daylight.

What is the warmest month in Boise?

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

What is the least humid month in Boise?

The least humid month is July, with an average relative humidity of 30%.

What is the driest month in Boise?

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

What month has the most sunshine in Boise?

The month with the most sunshine in Boise is July, with an average of 12.1h of sunshine.

When is the highest UV index in Boise?

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

What is the coldest month in Boise?

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).

When does it snow the most in Boise?

The month with the most snowfall in Boise, Idaho, is December when snow falls for 9.2 days and typically aggregates up to 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 of daylight.

What is the month with the least sunshine in Boise?

December has the least sunshine of the year, with an average of 5.5h of sunshine.
Average pressure - Boise, ID

The month with the highest atmospheric pressure is January (1024.4mbar).
The month with the lowest atmospheric pressure is June (1012.6mbar).

Average wind speed - Boise, ID

The windiest month (with the highest average wind speed) is April (11.4km/h).
The calmest month (with the lowest average wind speed) is January (8.4km/h).

Average rainfall - 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).

Average snowfall - Boise, ID

The month with the highest snowfall is December (169mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days - Boise, ID

The month with the highest number of snowfall days is December (9.2 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine - Boise, ID

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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).

Average visibility - Boise, ID

Months with the highest visibility are March, April, May, June, July, August, September, October and November (10km).
The month with the lowest visibility is January (8km).