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Hourly Forecast
Daylight Hours
07:29
Sunrise
19:49
Sunset
Moon
Waxing Crescent
11:29
Moonrise
20:50
Moonset
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Weather in Boise tomorrow, September 15, 2026
Boise looks cloudy on September 15, 2026, with grey skies for much of the day. Sunshine stays limited, so the overall tone is muted from the morning onward. Expect a grey start, with morning cloud around 96% by 00:00. Outdoor plans early on should not rely on bright skies.
The temperature range runs from about 9°C up to 21°C. Expect humidity between 36% and 72%, most humid near 11:00. Airflow remains manageable, reaching about 6.2 km/h around 11:00.
Through the afternoon cloud remains the main feature, with cover near 87% around 13:00. Bright spells should stay limited even as the day wears on. Expect visibility around 16.1 km. Daylight runs from 07:30 to 19:47, lasting 12 hours 16 minutes of sunlight today.
The practical takeaway for Boise on September 15, 2026 is a cloudy day that stays usable, just not particularly bright, around 21°C.
Frequently asked questions about weather in Boise
How warm does it get in Boise?
The warmest month in Boise is July, with average high temperatures of 36°C. The average temperature during this period is around 27°C.
How cold does it get in Boise?
The coldest month in Boise is January, with average low temperatures of -2°C. The average temperature during this period is around 1°C.
What is the wettest time of year in Boise?
The wettest month in Boise is December, with an average of 53mm of precipitation.
What is the driest time of year in Boise?
The driest month in Boise is July, with an average of 2mm of precipitation.
