Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 18°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
10th Apr
18

10

3

4
Saturday
11th Apr
19

7

5

4
Sunday
12th Apr
26

15

4

7
Monday
13th Apr
26

17

4

6
Tuesday
14th Apr
29

20

6

3

5-day weather forecast updated at 04:01 on Friday 10th 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 10th April 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 60% chance of some rain and a moderate breeze of 28 kph from the south-west.

18
°C maximum temperature
10
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
4
UV index (Moderate)
60
% chance of some rain
<5
mm of rainfall expected
18
°C wind chill
28
kph wind from SW

Decatur weather for Saturday 11th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south-east.

19
°C maximum temperature
7
°C minimum temperature
broken clouds
5
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
21
kph wind from SE

Decatur weather for Sunday 12th April 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 47% chance of some rain and a fresh breeze of 35 kph from the south.

26
°C maximum temperature
15
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
7
UV index (High)
47
% chance of some rain
<2
mm of rainfall expected
26
°C wind chill
35
kph wind from S

Decatur weather for Monday 13th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the south-west.

26
°C maximum temperature
17
°C minimum temperature
broken clouds
4
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
26
°C wind chill
28
kph wind from SW

Decatur weather for Tuesday 14th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 67% chance of some rain and a fresh breeze of 30 kph from the south-west.