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

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

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

April is a mild spring month in Boise, Idaho, with 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 chilly 48.9°F (9.4°C) in March, to a mild 56.7°F (13.7°C). Weather in April »

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

The first month of the summer, June, is a warm month in Boise, Idaho, with average temperature ranging between min 52.7°F (11.5°C) and max 75.7°F (24.3°C). In Boise, Idaho, the average high-temperature marginally rises, from an enjoyable 67.1°F (19.5°C) in May, to a warm 75.7°F (24.3°C). Weather in June »

July in Boise, Idaho, is a tropical summer month, with average temperature fluctuating between 60.6°F (15.9°C) and 87.8°F (31°C). The warmest month is July, 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 tropical 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 is relatively the same as in July - a still tropical 86.5°F (30.3°C). Weather in August »

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

October, like September, is a moderate autumn month in Boise, Idaho, with average temperature ranging between min 42.1°F (5.6°C) and max 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 »

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, 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 »

The first month of the winter, December, is still a cold month in Boise, Idaho, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 34.7°F (1.5°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 »

What is the most humid month in Boise?

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

How much does it rain in Boise?

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

When does it snow in Boise?

Months with snowfall are January through April, November and December.

How many days does it snow in Boise?

In Boise, Idaho, during the entire year, snow falls for 31.4 days, and aggregates up to 21.3" (541mm) of snow.

What are the months with 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.

What is the wettest 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?

May through October are months without snowfall.

When are the longest days in Boise?

With an average of 15.4h of daylight, June has the longest days of the year.

What is the warmest month in Boise?

July is the warmest month in Boise, Idaho, 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?

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

What is the driest month in Boise?

The month with the least rainfall in Boise, Idaho, is July when the rain falls for 4.5 days and typically collects 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.

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 in Boise, Idaho.

What is the coldest month in Boise?

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 in Boise.

When does it snow the most in Boise?

The month with the most snowfall 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 is December, with an average of 9h 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.
Average temperature - Boise, ID
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 lowest number of rainy days is July (4.5 days).

Average snowfall - Boise, ID

The month with the highest snowfall is December (6.65").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days - Boise, ID

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

Average daylight / Average sunshine - Boise, ID