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.

Tuesday
10th Mar
24

16

6

3
Wednesday
11th Mar
18

3

2

2
Thursday
12th Mar
10

-1

9

4
Friday
13th Mar
12

5

7

4
Saturday
14th Mar
14

2

2

4

5-day weather forecast updated at 04:01 on Tuesday 10th 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 Tuesday 10th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a fresh breeze of 29 kph from the south-west.

24
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
3
UV index (Moderate)
34
% chance of some rain
<2
mm of rainfall expected
24
°C wind chill
29
kph wind from SW

Decatur weather for Wednesday 11th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 18°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 20-30 mm of rainfall expected with 88% chance of some rain and a fresh breeze of 33 kph from the north-west.

18
°C maximum temperature
3
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
2
UV index (Low)
88
% chance of some rain
<30
mm of rainfall expected
0
no heat & humidity
33
kph wind from NW

Decatur weather for Thursday 12th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 31 kph from the south.

10
°C maximum temperature
-1
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
6
°C wind chill
31
kph wind from S

Decatur weather for Friday 13th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 4 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 34 kph from the west.

12
°C maximum temperature
5
°C minimum temperature
broken clouds
7
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
34
kph wind from W

Decatur weather for Saturday 14th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 14°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south-east.