Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 25°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Sunday
4th Oct
25

9

10

5
Monday
5th Oct
21

9

11

5
Tuesday
6th Oct
23

8

12

5
Wednesday
7th Oct
26

12

11

5
Thursday
8th Oct
24

10

8

4

5-day weather forecast updated at 04:01 on Sunday 4th October 2026 GMT

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

Decatur weather forecast by day

Below are the detailed weather forecasts for Decatur for the next 5 days.

Decatur weather for Sunday 4th October 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.

25
°C maximum temperature
9
°C minimum temperature
clear skies
10
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
25
°C wind chill
16
kph wind from NW

Decatur weather for Monday 5th October 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-east.

21
°C maximum temperature
9
°C minimum temperature
clear skies
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
21
°C wind chill
12
kph wind from NE

Decatur weather for Tuesday 6th October 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

23
°C maximum temperature
8
°C minimum temperature
clear skies
12
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
14
kph wind from S

Decatur weather for Wednesday 7th October 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.

26
°C maximum temperature
12
°C minimum temperature
scattered clouds
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
16
kph wind from NW

Decatur weather for Thursday 8th October 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the north-west.