Illinois weather live forecast

Today's maximum temperature in Illinois is expected to be 18°C. Select a day from the live weather forecast for Illinois (Chicago), USA for more weather parameters.

Wednesday
23rd Sep
18

16

2

4
Thursday
24th Sep
19

16

6

5
Friday
25th Sep
18

15

1

2
Saturday
26th Sep
19

14

10

5
Sunday
27th Sep
19

14

9

4

5-day weather forecast updated at 04:00 on Wednesday 23rd September 2026 GMT

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Destination

The 5-day weather forecast for Illinois (Chicago) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Top Illinois destinations

Below are temperatures expected today at popular countries, regions and places in Illinois. Select a destination to see the detailed weather forecast for today, tomorrow and the outlook for the next five days.

20
Springfield
18
Chicago

All Illinois destinations

Illinois weather forecast by day

Below are the detailed weather forecasts for Illinois for the next 5 days. The forecasts shown are for Chicago and may not represent the whole of Illinois. Browse more destinations in Illinois to view more weather forecasts.

Illinois weather for Wednesday 23rd September 2026

Expect broken clouds in Illinois with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-east.

18
°C maximum temperature
16
°C minimum temperature
broken clouds
2
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
18
°C wind chill
12
kph wind from NE

Illinois weather for Thursday 24th September 2026

Expect broken clouds in Illinois with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the east.

19
°C maximum temperature
16
°C minimum temperature
broken clouds
6
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
19
°C wind chill
9
kph wind from E

Illinois weather for Friday 25th September 2026

Expect broken clouds in Illinois with a maximum temperature of 18°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the east.

18
°C maximum temperature
15
°C minimum temperature
broken clouds
1
hour of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
6
kph wind from E

Illinois weather for Saturday 26th September 2026

Expect scattered clouds in Illinois with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 kph from the east.

19
°C maximum temperature
14
°C minimum temperature
scattered clouds
10
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
19
°C wind chill
4
kph wind from E

Illinois weather for Sunday 27th September 2026

Expect scattered clouds in Illinois with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 kph from the east.