Denver weather in September 2025

The temperatures in Denver in September are comfortable with low of 13°C and and high up to 25°C.

The wather in Denver 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 Denver in September 2025.

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

Temperatures

25° / 13°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

11.8

Hrs

Explore the weather in Denver in other months

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	4° / -6°	4	18	9	24 mm	Awful	Denver in January
February	4° / -6°	4	12	12	46 mm	Awful	Denver in February
March	10° / -1°	4	19	8	70 mm	Bad	Denver in March
April	14° / 2°	4	20	6	65 mm	Ok	Denver in April
May	19° / 7°	8	21	2	99 mm	Bad	Denver in May
June	28° / 14°	4	26	0	50 mm	Perfect	Denver in June
July	30° / 17°	4	27	0	65 mm	Good	Denver in July
August	28° / 16°	2	29	0	41 mm	Perfect	Denver in August
September	25° / 13°	2	27	0	36 mm	Perfect	Denver in September
October	16° / 5°	2	26	3	33 mm	Ok	Denver in October
November	11° / 0°	2	23	5	24 mm	Bad	Denver in November
December	4° / -6°	4	17	9	23 mm	Awful	Denver in December