Boise
Idaho, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho, with the tall city buildings
The golden fall season in Boise, Idaho, with the tall city buildings
January, the same as December, is a wintry winter month in Boise, Idaho, with temperature in the range of an average low of 24.6°F (-4.1°C) and an average high of 37.8°F (3.2°C). In January, the average high-temperature is essentially the same as in December - a still cold 37.8°F (3.2°C). Weather in January »
The last month of the winter, February, is a chilly month in Boise, Idaho, with average temperature varying between 44.8°F (7.1°C) and 28.2°F (-2.1°C). In February, the average high-temperature marginally rises, from a cold 37.8°F (3.2°C) in January, to a frosty 44.8°F (7.1°C). Weather in February »

March, the first month of the spring, in Boise, is a cool month, with average temperature varying between 54.7°F (12.6°C) and 34.3°F (1.3°C). In March, the average high-temperature increases, from a chilly 44.8°F (7.1°C) in February, to a cool 54.7°F (12.6°C). Weather in March »

April in Boise, Idaho, is an enjoyable spring month, with average temperature fluctuating between 62.2°F (16.8°C) and 39.4°F (4.1°C). In April, the average high-temperature slightly increases, from a fresh 54.7°F (12.6°C) in March, to a comfortable 62.2°F (16.8°C). Weather in April »

The last month of the spring, May, is a pleasant month in Boise, Idaho, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 71.6°F (22°C). In Boise, the average high-temperature in May increases, from a comfortable 62.2°F (16.8°C) in April, to an agreeable 71.6°F (22°C). Weather in May »

The first month of the summer, June, is a warm month in Boise, Idaho, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 53.8°F (12.1°C). In June, the average high-temperature increases, from a pleasant 71.6°F (22°C) in May, to a moderately hot 81.3°F (27.4°C). Weather in June »

July is a hot summer month in Boise, Idaho, with average temperature varying between 91.2°F (32.9°C) and 60.4°F (15.8°C). The warmest month is July, with an average high-temperature of 91.2°F (32.9°C) and an average low-temperature of 60.4°F (15.8°C). Weather in July »

The last month of the summer, August, is another tropical month in Boise, Idaho, with average temperature varying between 89.8°F (32.1°C) and 59.5°F (15.3°C). In Boise, the average high-temperature is relatively the same as in July - a still tropical 89.8°F (32.1°C). Weather in August »

September, the first month of the autumn, in Boise, is still a warm month, with average temperature ranging between max 78.8°F (26°C) and min 51.1°F (10.6°C). In September, the average high-temperature drops, from a hot 89.8°F (32.1°C) in August, to a moderately hot 78.8°F (26°C). Weather in September »

October, the same as September, is another comfortable autumn month in Boise, Idaho, with average temperature fluctuating between 64.8°F (18.2°C) and 40.8°F (4.9°C). In Boise, the average high-temperature drops, from a moderately hot 78.8°F (26°C) in September, to a comfortable 64.8°F (18.2°C). Weather in October »

November, the last month of the autumn, in Boise, is another chilly month, with temperature in the range of an average high of 48.2°F (9°C) and an average low of 31.8°F (-0.1°C). In Boise, Idaho, the average high-temperature significantly decreases, from an enjoyable 64.8°F (18.2°C) in October, to a chilly 48.2°F (9°C). Weather in November »

The first month of the winter, December, is still a cold month in Boise, Idaho, with average temperature fluctuating between 37.6°F (3.1°C) and 24.1°F (-4.4°C). With an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 24.1°F (-4.4°C), December is the coldest month. Weather in December »

What is the most humid month in Boise?

January is the most humid month in Boise, with an average relative humidity of 75%.

How many days does it rain in Boise?

In Boise, Idaho, during the entire year, the rain falls for 87.6 days and collects up to 11.7" (297.9mm) of precipitation.

When does it snow in Boise?

Months with snowfall are January through April, October through December.

How much does it snow in Boise?

Throughout the year, in Boise, Idaho, there are 19.4 snowfall days, and 19.2" (487.5mm) of snow is accumulated.

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

Months with the lowest UV index in Boise are January and December, with an average maximum UV index of 1.

When are the longest days in Boise?

June has the longest days of the year in Boise, with an average of 15.4h of daylight.

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

Months with the highest UV index in Boise, Idaho, are June and July, with an average maximum UV index of 9.

What is the warmest month in Boise?

July is the warmest month, with an average high-temperature of 91.2°F (32.9°C) and an average low-temperature of 60.4°F (15.8°C).

What is the least humid month in Boise?

With an average relative humidity of 36.1%, July is the least humid month.

What month has the most sunshine in Boise?

July has the most sunshine of the year, with an average of 12.9h of sunshine.

What is the driest month in Boise?

August is the month with the least rainfall in Boise. Rain falls for 2.4 days and accumulates 0.2" (6.1mm) of precipitation.

What is the coldest month in Boise?

December is the coldest month in Boise, Idaho, with an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 24.1°F (-4.4°C).

What is the rainiest month in Boise?

December is the month with the most rainfall. Rain falls for 11.8 days and accumulates 1.6" (39.4mm) of precipitation.

What is the snowiest month in Boise?

The month with the most snowfall in Boise is December when snow falls for 6 days and typically aggregates up to 7" (177.8mm) 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 in Boise, with an average of 3.4h of sunshine.
Average temperature - Boise, ID
Average humidity - Boise, ID
Average rainfall - Boise, ID
Average rainfall days - Boise, ID

The month with the highest number of rainy days is December (11.8 days).
The month with the lowest number of rainy days is August (2.4 days).

Average snowfall - Boise, ID
Average snowfall days - Boise, ID

The month with the highest number of snowfall days is December (6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine - Boise, ID