Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 23°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Thursday
2nd Apr
23

10

3

3
Friday
3rd Apr
25

17

3

3
Saturday
4th Apr
20

6

4

4
Sunday
5th Apr
11

4

8

5
Monday
6th Apr
16

3

5

6

5-day weather forecast updated at 04:01 on Thursday 2nd April 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 Thursday 2nd April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 23°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 88% chance of some rain and a strong breeze of 42 kph from the south.

23
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
3
UV index (Moderate)
88
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
42
kph wind from S

Decatur weather for Friday 3rd April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 73% chance of some rain and a moderate breeze of 28 kph from the south.

25
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
3
UV index (Moderate)
73
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
28
kph wind from S

Decatur weather for Saturday 4th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 78% chance of some rain and a fresh breeze of 29 kph from the west.

20
°C maximum temperature
6
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
4
UV index (Moderate)
78
% chance of some rain
<20
mm of rainfall expected
20
°C wind chill
29
kph wind from W

Decatur weather for Sunday 5th April 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the north-west.

11
°C maximum temperature
4
°C minimum temperature
scattered clouds
8
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
11
°C wind chill
26
kph wind from NW

Decatur weather for Monday 6th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the north-west.