Chicago weather in September 2025

The temperatures in Chicago in September are comfortable with low of 16°C and and high up to 24°C.

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

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

Temperatures

24° / 16°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

10.6

Hrs

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

Explore the weather in Chicago in other months

Chicago annual weather

Month	Temperatures	Rainy Days	Dry Days	Snowy Days	Rainfall	Weather	More details
January	-2° / -7°	5	11	15	39 mm	Awful	Chicago in January
February	0° / -6°	4	11	14	41 mm	Awful	Chicago in February
March	7° / 1°	6	19	6	55 mm	Bad	Chicago in March
April	12° / 5°	7	21	3	79 mm	Awful	Chicago in April
May	19° / 12°	7	24	0	98 mm	Ok	Chicago in May
June	24° / 17°	7	23	0	128 mm	Good	Chicago in June
July	27° / 20°	7	24	0	114 mm	Good	Chicago in July
August	27° / 19°	5	26	0	100 mm	Perfect	Chicago in August
September	24° / 16°	4	26	0	64 mm	Perfect	Chicago in September
October	16° / 10°	5	25	0	65 mm	Good	Chicago in October
November	9° / 3°	4	22	4	40 mm	Bad	Chicago in November
December	3° / -2°	5	16	10	38 mm	Awful	Chicago in December