Yellowstone weather in September 2025

The temperatures in Yellowstone in September are comfortable with low of 16°C and and high up to 26°C.

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

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

Temperatures

26° / 16°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

7.6

Hrs

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

Explore the weather in Yellowstone in other months

Yellowstone annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	3° / -4°	8	20	3	86 mm	Awful	Yellowstone in January
February	6° / -3°	8	17	4	104 mm	Awful	Yellowstone in February
March	12° / 3°	8	22	1	125 mm	Bad	Yellowstone in March
April	18° / 7°	9	21	0	151 mm	Ok	Yellowstone in April
May	23° / 13°	10	21	0	132 mm	Good	Yellowstone in May
June	28° / 18°	10	20	0	118 mm	Good	Yellowstone in June
July	30° / 20°	10	21	0	108 mm	Ok	Yellowstone in July
August	29° / 19°	8	23	0	80 mm	Ok	Yellowstone in August
September	26° / 16°	6	24	0	73 mm	Perfect	Yellowstone in September
October	19° / 9°	6	25	0	94 mm	Good	Yellowstone in October
November	11° / 3°	6	23	1	90 mm	Ok	Yellowstone in November
December	6° / -1°	8	21	2	103 mm	Awful	Yellowstone in December

Temperatures in Yellowstone in September

Rain in Yellowstone in September

Weather in Yellowstone in September - FAQ

What is the average temperature in Yellowstone in September?

The average temperature in Yellowstone in September is 16/26° C.

What is the chance of rain in Yellowstone in September?

On average, there are 6 rainy days in Yellowstone during September.

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

The weather in Yellowstone in September is perfect.

Can it snow in Yellowstone in September?

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

More about the weather in Yellowstone