Idaho Falls weather in September 2025

The temperatures in Idaho Falls in September are quite cold with temperatures between 9°C and 25°C, warm clothes are a must.

You can expect about 3 to 8 days of rain in Idaho Falls 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 Falls in September 2025.

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

Temperatures

25° / 9°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

10.4

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 34° /15°	2 32° /13°	3 31° /12°	4 26° /13°	5 30° /10°	6 32° /11°
7 34° /13°	8 31° /12°	9 29° /9°	10 29° /9°	11 28° /7°	12 24° /6°	13 25° /6°
14 25° /8°	15 25° /9°	16 24° /8°	17 23° /6°	18 23° /7°	19 25° /8°	20 25° /4°
21 20° /5°	22 19° /6°	23 23° /8°	24 23° /2°	25 27° /5°	26 26° /9°	27 25° /4°
28 25° /5°	29 22° /8°	30 18° /6°

Explore the weather in Idaho Falls in other months

Idaho Falls annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	-2° / -11°	4	9	18	34 mm	Awful	Idaho Falls in January
February	-1° / -9°	6	6	18	31 mm	Awful	Idaho Falls in February
March	6° / -3°	6	14	12	40 mm	Awful	Idaho Falls in March
April	12° / 1°	6	19	6	43 mm	Bad	Idaho Falls in April
May	18° / 5°	6	23	1	59 mm	Good	Idaho Falls in May
June	25° / 8°	3	27	0	32 mm	Perfect	Idaho Falls in June
July	31° / 12°	1	30	0	22 mm	Good	Idaho Falls in July
August	30° / 12°	2	29	0	38 mm	Good	Idaho Falls in August
September	25° / 9°	3	27	0	47 mm	Perfect	Idaho Falls in September
October	14° / 3°	4	25	2	44 mm	Ok	Idaho Falls in October
November	6° / -3°	4	17	9	26 mm	Awful	Idaho Falls in November
December	-2° / -9°	5	8	18	35 mm	Awful	Idaho Falls in December

Temperatures in Idaho Falls in September

Rain in Idaho Falls in September

Weather in Idaho Falls in September - FAQ

What is the average temperature in Idaho Falls in September?

The average temperature in Idaho Falls in September is 9/25° C.

What is the chance of rain in Idaho Falls in September?

On average, there are 3 rainy days in Idaho Falls during September.

Weather wise, is September a good time to visit Idaho Falls?

The weather in Idaho Falls in September is perfect.

Can it snow in Idaho Falls in September?

On average, there are 0 snowy days in Idaho Falls in September.

More about the weather in Idaho Falls