Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 26°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
30th Mar
26

14

6

6
Tuesday
31st Mar
26

16

1

5
Wednesday
1st Apr
15

7

0

1
Thursday
2nd Apr
23

12

2

5
Friday
3rd Apr
22

13

4

2

5-day weather forecast updated at 04:01 on Monday 30th March 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 Monday 30th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 31 kph from the south.

26
°C maximum temperature
14
°C minimum temperature
broken clouds
6
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
31
kph wind from S

Decatur weather for Tuesday 31st March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 75% chance of some rain and a fresh breeze of 35 kph from the south-west.

26
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
5
UV index (Moderate)
75
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
35
kph wind from SW

Decatur weather for Wednesday 1st April 2026

Expect cloudy with some rain in Decatur, Illinois with a maximum temperature of 15°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 95% chance of some rain and a moderate breeze of 24 kph from the east.

15
°C maximum temperature
7
°C minimum temperature
cloudy with some rain
0
hours of sunshine
1
UV index (Low)
95
% chance of some rain
<20
mm of rainfall expected
15
°C wind chill
24
kph wind from E

Decatur weather for Thursday 2nd April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 95% chance of some rain and a fresh breeze of 36 kph from the south.

23
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
5
UV index (Moderate)
95
% chance of some rain
<20
mm of rainfall expected
23
°C wind chill
36
kph wind from S

Decatur weather for Friday 3rd April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 22°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 53% chance of some rain and a moderate breeze of 22 kph from the south-east.