Weather in September 2025

Idaho weather in September 2025

The temperatures in Idaho in September are quite cold with temperatures between 9°C and 19°C, warm clothes are a must.

You can expect about 3 to 8 days of rain in Idaho during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Idaho in September 2025.

If you’re planning to visit Idaho in the near future, we highly recommend that you review the 14 day weather forecast for Idaho before you arrive.

Temperatures
Temperatures
19° / 9°
Rainy Days
Rainy Days
4
Snowy Days
Snowy Days
0
Dry Days
Dry Days
26
Rainfall
Rainfall
37
mm
11.5
Sun Hours
11.5
Hrs

Idaho annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January -15° / -22° 1 23 7 3 mm
Awful
February -11° / -19° 2 19 7 6 mm
Awful
March 0° / -9° 3 20 8 10 mm
Awful
April 11° / 1° 1 25 3 22 mm
Bad
May 19° / 8° 4 27 1 44 mm
Good
June 24° / 15° 5 25 0 60 mm
Perfect
July 27° / 18° 5 26 0 84 mm
Perfect
August 25° / 16° 3 28 0 57 mm
Perfect
September 19° / 9° 4 26 0 37 mm
Good
October 9° / 1° 2 26 3 24 mm
Bad
November -3° / -9° 2 21 8 12 mm
Awful
December -13° / -19° 1 22 7 4 mm
Awful
Temperatures in Idaho in September
Rain in Idaho in September

Recommended Hotels in Idaho

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That’s why we run our special tools and found the best hotels in Idaho. Click on hotel for more details.

Weather in Idaho in September - FAQ

What is the average temperature in Idaho in September?
The average temperature in Idaho in September is 9/19° C.
What is the chance of rain in Idaho in September?
On average, there are 4 rainy days in Idaho during September.
Weather wise, is September a good time to visit Idaho?
The weather in Idaho in September is good.
Can it snow in Idaho in September?
On average, there are 0 snowy days in Idaho in September.
Cities in Idaho

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More about the weather in Idaho