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Hourly Forecast
Daylight Hours
06:46
Sunrise
19:00
Sunset
Moon
Waxing Crescent
11:39
Moonrise
20:40
Moonset
Daily Forecast
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Air Quality Data Available
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UV Index
Humidity
Weather in Sun Valley today, September 15, 2026
Conditions in Sun Valley on September 15, 2026 favour clear skies, so the day opens with a fine, sunny outlook. Any interruptions to the blue should be brief rather than lasting. Expect a grey start, with morning cloud around 100% by 04:00. Outdoor plans early on should not rely on bright skies.
The day peaks near 27°C and cools toward 10°C. The air stays humid, with relative humidity between 8% and 36% and the peak around 07:00. Airflow remains manageable, reaching about 8.4 km/h around 19:00.
Expect a more open afternoon, with limited cloud around 8% by 20:00. Residual damp risk should be lower than earlier. Expect visibility around 16.1 km. Sunrise is at 06:46 and sunset at 19:00, giving 12 hours 14 minutes of sunlight today.
The practical takeaway for Sun Valley is a bright September 15, 2026, ideal for outdoor errands before temperatures ease from about 27°C.
Frequently asked questions about weather in Sun Valley
How warm does it get in Sun Valley?
The warmest month in Sun Valley is July, with average high temperatures of 32°C. The average temperature during this period is around 24°C.
How cold does it get in Sun Valley?
The coldest month in Sun Valley is February, with average low temperatures of -4°C. The average temperature during this period is around 1°C.
What is the wettest time of year in Sun Valley?
The wettest month in Sun Valley is January, with an average of 84mm of precipitation.
What is the driest time of year in Sun Valley?
The driest month in Sun Valley is July, with an average of 9mm of precipitation.
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