Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 27°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Tuesday
31st Mar
27

17

4

4
Wednesday
1st Apr
16

8

0

2
Thursday
2nd Apr
23

14

2

3
Friday
3rd Apr
25

15

3

2
Saturday
4th Apr
19

6

2

2

5-day weather forecast updated at 04:01 on Wednesday 1st 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 Tuesday 31st March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 20-30 mm of rainfall expected with 94% chance of some rain and a fresh breeze of 31 kph from the south-west.

27
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
4
UV index (Moderate)
94
% chance of some rain
<30
mm of rainfall expected
L
low heat & humidity
31
kph wind from SW

Decatur weather for Wednesday 1st April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 30-40 mm of rainfall expected with 86% chance of some rain and a moderate breeze of 24 kph from the north-east.

16
°C maximum temperature
8
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
2
UV index (Low)
86
% chance of some rain
<40
mm of rainfall expected
16
°C wind chill
24
kph wind from NE

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 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 90% chance of some rain and a strong breeze of 40 kph from the south.

23
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
3
UV index (Moderate)
90
% chance of some rain
<5
mm of rainfall expected
23
°C wind chill
40
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 2 (Low) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 68% chance of some rain and a moderate breeze of 26 kph from the south.

25
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
2
UV index (Low)
68
% chance of some rain
<5
mm of rainfall expected
25
°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 2 (Low) and 2 hours of bright sunshine. There are 20-30 mm of rainfall expected with 90% chance of some rain and a moderate breeze of 27 kph from the west.