Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 30°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Thursday
26th Mar
30

8

7

7
Friday
27th Mar
10

2

7

7
Saturday
28th Mar
10

-2

11

7
Sunday
29th Mar
14

4

1

2
Monday
30th Mar
26

12

7

7

5-day weather forecast updated at 04:01 on Thursday 26th 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 Thursday 26th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 10-20 mm of rainfall expected with 97% chance of some rain and a fresh breeze of 34 kph from the south-west.

30
°C maximum temperature
8
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
7
UV index (High)
97
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
34
kph wind from SW

Decatur weather for Friday 27th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 15% chance of some rain and a fresh breeze of 34 kph from the north.

10
°C maximum temperature
2
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
7
UV index (High)
15
% chance of some rain
<10
mm of rainfall expected
6
°C wind chill
34
kph wind from N

Decatur weather for Saturday 28th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south.

10
°C maximum temperature
-2
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
17
kph wind from S

Decatur weather for Sunday 29th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 14°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south.

14
°C maximum temperature
4
°C minimum temperature
broken clouds
1
hour of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
21
kph wind from S

Decatur weather for Monday 30th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the south.