Boise weather in September 2020

  • 25°C maximum daytime temperature in September in Boise25
    25°C max day temperature
  • 10 hours of sunshine per day
  • 4 days with some rainfall in September in Boise4
    4 days with some rainfall
  • 8°C minimum night-time temperature in September in Boise8
    8°C min night temperature
  • 12 hours of daylight per day in September in Boise12
    12 hours of daylight per day
  • No heat & humidity in September in Boise0
    No heat & humidity
  • 19 mm monthly rainfall in September in Boise19
    19 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Boise6
    6 (High) UV index
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The September weather guide for Boise, 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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How hot is it in Boise in September?

Daytime temperatures usually reach 25°C in Boise in September with no heat and humidity, falling to 8°C at night.

How sunny is it in Boise in September?

There are normally 10 hours of bright sunshine each day in Boise in September - that's 80% of daylight hours.

Does it rain in Boise in September?

There are usually 4 days with some rain in Boise in September and the average monthly rainfall is 19mm.

Boise sunrise & sunset times for September 2020

Browse the sunrise & sunset times for Boise in September 2020. Select a month to view Boise sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Tuesday, 1st September 2020 07:09 20:19
Tuesday, 15th September 2020 07:25 19:54
Wednesday, 30th September 2020 07:42 19:26
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Expires at 23:59 on Saturday 29th Feb 2020 · View all G Adventures offers

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

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Where's hot in Idaho in September?

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

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