Annual mean 11°C · wettest around December · prevailing wind SW
Warmest
31.3 °C
Coldest
4.0 °C
Wettest
53%
Windiest
4.8 m/s
Prevailing
SW
3.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Sun Valley over the whole year is 11°C. July is the hottest month, with highs of about 31°C; February is the coldest, with lows of about -3°C. The rainy (wet) season in Sun Valley runs from August to June, peaking in December with a 57% chance of rain on a given day. The dry season is July; July is the driest month, at 28%. Winds in Sun Valley are highest in April, averaging 3.4 m/s (12 km/h), and lightest in December, at 2.1 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Sun Valley come in July, when the sky is typically 14% covered; March is the cloudiest month, at 47%.
Month by month Sun Valley climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
5°C
-2°C
0°C
57%
45%
2.2 m/s
0
0
15
February
6°C
-3°C
1°C
57%
41%
2.8 m/s
1
0
25
March
9°C
-0°C
4°C
57%
47%
3.2 m/s
5
0
33
April
15°C
3°C
9°C
53%
36%
3.4 m/s
22
0
61
May
19°C
8°C
14°C
53%
33%
3.3 m/s
47
5
71
June
26°C
13°C
21°C
43%
19%
3.3 m/s
68
31
54
July
31°C
16°C
27°C
28%
14%
3.0 m/s
56
63
23
August
29°C
14°C
25°C
49%
19%
2.8 m/s
65
59
28
September
24°C
9°C
20°C
53%
22%
2.6 m/s
69
24
60
October
17°C
3°C
13°C
52%
22%
2.2 m/s
44
2
72
November
10°C
-0°C
5°C
54%
33%
2.3 m/s
9
0
42
December
5°C
-2°C
1°C
57%
44%
2.1 m/s
0
0
14
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Sun Valley weather by season
Year round, Sun Valley has days of about 5°C at their warmest in January, its coolest month, and 31°C in July, its warmest; the coolest hours of the day run from -3°C to 16°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around December and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Sun Valley weather in winterDecember to February
High 5°CLow -2°CRain 57%
Winter in Sun Valley has typical daily highs of about 5°C and lows of about -2°C, with a 57% chance of rain on a given day.
Sun Valley weather in springMarch to May
High 14°CLow 4°CRain 54%
Spring in Sun Valley has typical daily highs of about 14°C and lows of about 4°C, with a 54% chance of rain on a given day.
Sun Valley weather in summerJune to August
High 29°CLow 14°CRain 40%
Summer in Sun Valley has typical daily highs of about 29°C and lows of about 14°C, with a 40% chance of rain on a given day.
Sun Valley weather in autumnSeptember to November
High 17°CLow 4°CRain 53%
Autumn in Sun Valley has typical daily highs of about 17°C and lows of about 4°C, with a 53% chance of rain on a given day.
When is the rainy season in Sun Valley?
The rainy (wet) season in Sun Valley runs from August to June, peaking in December with a 57% chance of rain on a given day. The dry season is July; July is the driest month, at 28%.
What time of year is Sun Valley windiest?
Winds in Sun Valley are highest in April, averaging 3.4 m/s (12 km/h), and lightest in December, at 2.1 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Sun Valley year round?
The average temperature in Sun Valley over the whole year is 11°C. July is the hottest month, with highs of about 31°C; February is the coldest, with lows of about -3°C.