Illinois weather live forecast

Today's maximum temperature in Illinois is expected to be 34°C. Select a day from the live weather forecast for Illinois (Chicago), USA for more weather parameters.

Friday
4th Sep
34

26

10

7
Saturday
5th Sep
28

24

6

7
Sunday
6th Sep
26

23

11

7
Monday
7th Sep
26

22

9

7
Tuesday
8th Sep
29

21

10

4

5-day weather forecast updated at 04:00 on Friday 4th 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.

37
Springfield
34
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 Friday 4th September 2026

Expect isolated thunderstorms in Illinois with a maximum temperature of 34°C, high levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 30% chance of some rain and a light breeze of 7 kph from the south-west.

34
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
10
hours of sunshine
7
UV index (High)
30
% chance of some rain
<2
mm of rainfall expected
H
high heat & humidity
7
kph wind from SW

Illinois weather for Saturday 5th September 2026

Expect isolated thunderstorms in Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 19% chance of some rain and a light breeze of 10 kph from the north.

28
°C maximum temperature
24
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
19
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
10
kph wind from N

Illinois weather for Sunday 6th September 2026

Expect scattered clouds in Illinois with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the east.

26
°C maximum temperature
23
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
9
kph wind from E

Illinois weather for Monday 7th September 2026

Expect scattered clouds in Illinois with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the south-east.

26
°C maximum temperature
22
°C minimum temperature
scattered clouds
9
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
7
kph wind from SE

Illinois weather for Tuesday 8th September 2026

Expect scattered clouds in Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south.