Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 24°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
3rd Apr
24

14

5

3
Saturday
4th Apr
19

5

2

3
Sunday
5th Apr
11

2

9

6
Monday
6th Apr
14

3

12

6
Tuesday
7th Apr
9

-1

1

6

5-day weather forecast updated at 04:01 on Friday 3rd 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 Friday 3rd April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 63% chance of some rain and a moderate breeze of 26 kph from the south.

24
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
3
UV index (Moderate)
63
% chance of some rain
<10
mm of rainfall expected
24
°C wind chill
26
kph wind from S

Decatur weather for Saturday 4th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 68% chance of some rain and a fresh breeze of 29 kph from the west.

19
°C maximum temperature
5
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
3
UV index (Moderate)
68
% chance of some rain
<20
mm of rainfall expected
19
°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 6 (High) and 9 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
2
°C minimum temperature
scattered clouds
9
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
11
°C wind chill
26
kph wind from NW

Decatur weather for Monday 6th April 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 14°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the north-west.

14
°C maximum temperature
3
°C minimum temperature
scattered clouds
12
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
14
°C wind chill
26
kph wind from NW

Decatur weather for Tuesday 7th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 9°C, maximum UV of 6 (High) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the north.