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.

Sunday
26th Apr
24

11

8

7
Monday
27th Apr
25

16

6

6
Tuesday
28th Apr
19

13

3

8
Wednesday
29th Apr
17

9

11

6
Thursday
30th Apr
18

7

5

7

5-day weather forecast updated at 04:01 on Sunday 26th 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 Sunday 26th April 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the south-east.

24
°C maximum temperature
11
°C minimum temperature
scattered clouds
8
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
24
°C wind chill
22
kph wind from SE

Decatur weather for Monday 27th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 30-40 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 37 kph from the south-east.

25
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
99
% chance of some rain
<40
mm of rainfall expected
25
°C wind chill
37
kph wind from SE

Decatur weather for Tuesday 28th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 8 (Very High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 31% chance of some rain and a moderate breeze of 23 kph from the west.

19
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
8
UV index (Very High)
31
% chance of some rain
<5
mm of rainfall expected
19
°C wind chill
23
kph wind from W

Decatur weather for Wednesday 29th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 17°C, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 17% chance of some rain and a moderate breeze of 24 kph from the north.

17
°C maximum temperature
9
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
6
UV index (High)
17
% chance of some rain
<2
mm of rainfall expected
17
°C wind chill
24
kph wind from N

Decatur weather for Thursday 30th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 18°C, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north-west.