Sun Valley weather by month

Check out Sun Valley weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & UV index

Temperature in Sun Valley (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	-2	1	4	10	16	20	26	25	20	13	4	-1
Min temperature (night-time)	-14	-12	-9	-5	-1	3	6	5	1	-4	-9	-13
Heat & Humidity	0	0	0	0	0	0	0	0	0	0	0	0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in Sun Valley

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	4	6	7	9	9	10	12	10	9	7	4	4
Daily hours of daylight	9	11	12	13	15	15	15	14	12	11	10	9
UV Index (Maximum)	2	2	4	6	8	9	10	9	6	4	2	1

Rainfall in Sun Valley

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	13	11	13	11	11	9	7	8	8	7	11	13
Average monthly rainfall (mm)	67	50	44	33	43	42	21	27	26	29	48	67

More about Sun Valley

Sun Valley by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Idaho (Sun Valley) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Sun Valley?

Sun Valley has a cold climate with warm dry summers.

Sun Valley weather in January

Expect daytime maximum temperatures of -2°C in Sun Valley, Idaho in January based on long-term weather averages. There are 4 hours of sunshine per day on average with 13 days with some rainfall and typically 67 mm of rainfall in the month, which might fall as snow.

-2
-2°C max day temperature
4
4 hours of sunshine per day
13
13 days with some rainfall
-14
-14°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
67
67 mm of monthly rainfall
2
2 (Low) UV index

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Sun Valley weather in February

Expect daytime maximum temperatures of 1°C in Sun Valley, Idaho in February based on long-term weather averages. There are 6 hours of sunshine per day on average with 11 days with some rainfall and typically 50 mm of rainfall in the month, which might fall as snow.

1
1°C max day temperature
6
6 hours of sunshine per day
11
11 days with some rainfall
-12
-12°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
50
50 mm of monthly rainfall
2
2 (Low) UV index

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Sun Valley weather in March

Expect daytime maximum temperatures of 4°C in Sun Valley, Idaho in March based on long-term weather averages. There are 7 hours of sunshine per day on average with 13 days with some rainfall and typically 44 mm of rainfall in the month, which might fall as snow.

4
4°C max day temperature
7
7 hours of sunshine per day
13
13 days with some rainfall
-9
-9°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
44
44 mm of monthly rainfall
4
4 (Moderate) UV index

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Sun Valley weather in April

Expect daytime maximum temperatures of 10°C in Sun Valley, Idaho in April based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall.

10
10°C max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
-5
-5°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
33
33 mm of monthly rainfall
6
6 (High) UV index

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Sun Valley weather in May

Expect daytime maximum temperatures of 16°C in Sun Valley, Idaho in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 43 mm of rainfall in the month.

16
16°C max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
-1
-1°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
43
43 mm of monthly rainfall
8
8 (Very High) UV index

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Sun Valley weather in June

Expect daytime maximum temperatures of 20°C in Sun Valley, Idaho in June based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 42 mm of rainfall in the month.

20
20°C max day temperature
10
10 hours of sunshine per day
9
9 days with some rainfall
3
3°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
42
42 mm of monthly rainfall
9
9 (Very High) UV index

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Sun Valley weather in July

Expect daytime maximum temperatures of 26°C in Sun Valley, Idaho in July based on long-term weather averages. There are 12 hours of sunshine per day on average.

26
26°C max day temperature
12
12 hours of sunshine per day
7
7 days with some rainfall
6
6°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
21
21 mm of monthly rainfall
10
10 (Very High) UV index

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Sun Valley weather in August

Expect daytime maximum temperatures of 25°C in Sun Valley, Idaho in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

25
25°C max day temperature
10
10 hours of sunshine per day
8
8 days with some rainfall
5
5°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
27
27 mm of monthly rainfall
9
9 (Very High) UV index

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Sun Valley weather in September

Expect daytime maximum temperatures of 20°C in Sun Valley, Idaho in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

20
20°C max day temperature
9
9 hours of sunshine per day
8
8 days with some rainfall
1
1°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
26
26 mm of monthly rainfall
6
6 (High) UV index

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Sun Valley weather in October

Expect daytime maximum temperatures of 13°C in Sun Valley, Idaho in October based on long-term weather averages. There are 7 hours of sunshine per day on average.

13
13°C max day temperature
7
7 hours of sunshine per day
7
7 days with some rainfall
-4
-4°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
29
29 mm of monthly rainfall
4
4 (Moderate) UV index

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Sun Valley weather in November

Expect daytime maximum temperatures of 4°C in Sun Valley, Idaho in November based on long-term weather averages. There are 4 hours of sunshine per day on average with 11 days with some rainfall and typically 48 mm of rainfall in the month, which might fall as snow.

4
4°C max day temperature
4
4 hours of sunshine per day
11
11 days with some rainfall
-9
-9°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
48
48 mm of monthly rainfall
2
2 (Low) UV index

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Sun Valley weather in December

Expect daytime maximum temperatures of -1°C in Sun Valley, Idaho in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 13 days with some rainfall and typically 67 mm of rainfall in the month, which might fall as snow.