Idaho weather in September 2019

Below are average maximum temperatures at popular destinations in Idaho in September. Select a destination to see more weather parameters.

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The September weather guide for Idaho shows long term 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.

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Metric (°C / mm)  |  Imperial (°F / inches)

Guide to Idaho weather in September

The average maximum daytime temperature in Idaho in September is a warm 25°C (77°F). The average night-time temperature is usually a cool 8°C (46°F). There are usually 10 hours of bright sunshine each day, which represents 80% of the 12 hours of daylight.

Expect 19mm (0.7 inches) of rainfall across the whole of September with 4 days with some rain falling. Maximum UV levels will be high (6 UV index) at midday when the skies are clear.

The weather in Idaho in September is represented by Boise.

Idaho sunrise & sunset times for September 2019

Browse the sunrise & sunset times for Idaho in September 2019. Select a month to view Idaho sunrise & sunset times for the next twelve months. The Idaho sunrise & sunset times shown below are for Boise.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 07:08 20:20
Sunday, 15th September 2019 07:24 19:55
Monday, 30th September 2019 07:41 19:28
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