Missoula weather in September 2025

The weather in Missoula in September is very cold with temperatures between 4°C and 23°C, warm clothes are a must.

The wather in Missoula in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.

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

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

Temperatures

23° / 4°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

9.0

Hrs

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

Explore the weather in Missoula in other months

Missoula annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	1° / -10°	8	6	18	36 mm	Awful	Missoula in January
February	1° / -11°	8	3	19	42 mm	Awful	Missoula in February
March	6° / -6°	8	9	14	40 mm	Awful	Missoula in March
April	10° / -4°	8	13	9	41 mm	Bad	Missoula in April
May	17° / 0°	6	23	2	42 mm	Ok	Missoula in May
June	22° / 3°	6	25	0	40 mm	Good	Missoula in June
July	29° / 7°	2	29	0	12 mm	Good	Missoula in July
August	29° / 7°	2	29	0	15 mm	Good	Missoula in August
September	23° / 4°	2	28	0	19 mm	Perfect	Missoula in September
October	13° / -2°	5	23	4	35 mm	Bad	Missoula in October
November	5° / -7°	7	12	12	32 mm	Awful	Missoula in November
December	0° / -11°	9	5	18	34 mm	Awful	Missoula in December

Temperatures in Missoula in September

Rain in Missoula in September

Weather in Missoula in September - FAQ

What is the average temperature in Missoula in September?

The average temperature in Missoula in September is 4/23° C.

What is the chance of rain in Missoula in September?

On average, there are 2 rainy days in Missoula during September.

Weather wise, is September a good time to visit Missoula?

The weather in Missoula in September is perfect.

Can it snow in Missoula in September?

On average, there are 0 snowy days in Missoula in September.

More about the weather in Missoula