Climate and monthly weather forecast
Sun Valley, ID

The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness
The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness

Weather in January

January, like December, is another subzero cold winter month in Sun Valley, Idaho, with an average temperature ranging between max 26.8°F (-2.9°C) and min 8.4°F (-13.1°C). In January, the average high-temperature is practically the same as in December - a still freezing cold 26.8°F (-2.9°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Sun Valley, Idaho, with an average temperature ranging between min 10°F (-12.2°C) and max 27°F (-2.8°C). In February, the average high-temperature is practically the same as in January - a still freezing cold 27°F (-2.8°C). Weather in February »

Weather in March

March, the first month of the spring in Sun Valley, is a wintry month, with an average temperature fluctuating between 32.2°F (0.1°C) and 16.9°F (-8.4°C). In March, the average high-temperature is almost the same as in February - a wintry 32.2°F (0.1°C). Weather in March »

Weather in April

April, like March, in Sun Valley, Idaho, is a wintry spring month, with an average temperature fluctuating between 23.4°F (-4.8°C) and 39.9°F (4.4°C). In Sun Valley, the average high-temperature in April marginally rises from a wintry 32.2°F (0.1°C) in March to a still cold 39.9°F (4.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a fresh month in Sun Valley, Idaho, with an average temperature ranging between min 32.9°F (0.5°C) and max 51.4°F (10.8°C). In May, the average high-temperature rises from a cold 39.9°F (4.4°C) in April to a cool 51.4°F (10.8°C). Weather in May »

Weather in June

June, the first month of the summer in Sun Valley, is an enjoyable month, with an average temperature varying between 62.4°F (16.9°C) and 41.5°F (5.3°C). In Sun Valley, the average high-temperature in June rises from a cool 51.4°F (10.8°C) in May to an enjoyable 62.4°F (16.9°C). Weather in June »

Weather in July

July in Sun Valley, Idaho, is a warm summer month, with an average temperature ranging between min 50.5°F (10.3°C) and max 74.1°F (23.4°C). July is the warmest month, with an average high-temperature of 74.1°F (23.4°C) and an average low-temperature of 50.5°F (10.3°C). Weather in July »

Weather in August

The last month of the summer, August, is another pleasant month in Sun Valley, Idaho, with temperature in the range of an average high of 73.2°F (22.9°C) and an average low of 50.5°F (10.3°C). In August, the average high-temperature is almost the same as in July - an agreeable 73.2°F (22.9°C). Weather in August »

Weather in September

September, the first month of the autumn in Sun Valley, is also an enjoyable month, with an average temperature fluctuating between 63.7°F (17.6°C) and 43.2°F (6.2°C). In September, the average high-temperature drops from a pleasant 73.2°F (22.9°C) in August to an enjoyable 63.7°F (17.6°C). Weather in September »

Weather in October

October, the same as September, in Sun Valley, Idaho, is another chilly autumn month, with an average temperature ranging between min 31.1°F (-0.5°C) and max 48°F (8.9°C). In Sun Valley, the average high-temperature in October plummets from a comfortable 63.7°F (17.6°C) in September to a chilly 48°F (8.9°C). Weather in October »

Weather in November

November, the last month of the autumn in Sun Valley, is also a wintry month, with an average temperature varying between 18.9°F (-7.3°C) and 34.7°F (1.5°C). In November, the average high-temperature decreases from a chilly 48°F (8.9°C) in October to a cold 34.7°F (1.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Sun Valley, Idaho, with an average temperature fluctuating between 8.6°F (-13°C) and 25°F (-3.9°C). December is the coldest month, with an average high-temperature of 25°F (-3.9°C) and an average low-temperature of 8.6°F (-13°C). Weather in December »
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FAQ

How many days does it rain in Sun Valley?

Throughout the year, in Sun Valley, there are 107.7 rainfall days, and 15.63" (397mm) of precipitation is accumulated.

When does it snow in Sun Valley?

January through June, September through December are months with snowfall in Sun Valley, Idaho.

How much does it snow in Sun Valley?

Throughout the year, in Sun Valley, Idaho, there are 88.2 snowfall days, and 69.45" (1764mm) of snow is accumulated.

What is the month with the least sunshine in Sun Valley?

With an average of 5.7h of sunshine, January has the least sunshine of the year.

What is the most humid month in Sun Valley?

February is the most humid month in Sun Valley, with an average relative humidity of 87%.

What is the snowiest month in Sun Valley?

February is the month with the most snowfall in Sun Valley, Idaho. Snow falls for 15.5 days and accumulates 15" (381mm) of snow.

What is the month with the lowest UV index in Sun Valley?

The month with the lowest UV index is February, with an average maximum UV index of 1.

What is the wettest month in Sun Valley?

The month with the most rainfall in Sun Valley, Idaho, is March, when the rain falls for 11.4 days and typically aggregates up to 2.01" (51mm) of precipitation.

When is Daylight Saving Time (DST) in Sun Valley?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, 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 are the longest days in Sun Valley?

With an average of 15h and 23min of daylight, June has the longest days of the year.

What is the month with the highest UV index in Sun Valley?

The months with the highest UV index are June and July, with an average maximum UV index of 5.

What is the warmest month in Sun Valley?

With an average high-temperature of 74.1°F (23.4°C) and an average low-temperature of 50.5°F (10.3°C), July is the warmest month.

What is the driest month in Sun Valley?

July is the month with the least rainfall. Rain falls for 5.9 days and accumulates 0.43" (11mm) of precipitation.

When it does not snow in Sun Valley?

In Sun Valley, snow does not fall in July and August.

What month has the most sunshine in Sun Valley?

The month with the most sunshine is July, with an average of 12h of sunshine.

What is the least humid month in Sun Valley?

August is the least humid month, with an average relative humidity of 37%.

What is the coldest month in Sun Valley?

With an average high-temperature of 25°F (-3.9°C) and an average low-temperature of 8.6°F (-13°C), December is the coldest month in Sun Valley, Idaho.

What is the month with the shortest days in Sun Valley?

The month with the shortest days in Sun Valley, Idaho, is December, with an average of 8h and 59min of daylight.

Average temperature
Sun Valley, ID

Average temperature - Sun Valley, ID

The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (25°F).

The months with the highest average low temperature are July and August (50.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).

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Average pressure
Sun Valley, ID

Average pressure - Sun Valley, ID

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed
Sun Valley, ID

Average wind speed - Sun Valley, ID

The windiest month (with the highest average wind speed) is July (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.5mph).

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Average rainfall
Sun Valley, ID

Average rainfall - Sun Valley, ID

The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days
Sun Valley, ID

Average rainfall days - Sun Valley, ID

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is July (5.9 days).

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Average snowfall
Sun Valley, ID

Average snowfall - Sun Valley, ID

The month with the highest snowfall is February (15").
The months with the least snowfall are July and August (0").

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Average snowfall days
Sun Valley, ID

Average snowfall days - Sun Valley, ID

The month with the highest number of snowfall days is March (16 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight / Average sunshine
Sun Valley, ID

Average daylight / Average sunshine - Sun Valley, ID

The month with the longest days is June (Average daylight: 15h and 23min).
The month with the shortest days is December (Average daylight: 8h and 59min).

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).

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Average sunshine days
Sun Valley, ID

Average sunshine days - Sun Valley, ID

The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is April (11.1 days).

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Average visibility
Sun Valley, ID

Average visibility - Sun Valley, ID

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

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