Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 21°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
9th Mar
21

8

9

5
Tuesday
10th Mar
23

17

3

5
Wednesday
11th Mar
19

2

1

1
Thursday
12th Mar
8

0

6

4
Friday
13th Mar
12

4

9

5

5-day weather forecast updated at 04:01 on Monday 9th 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 9th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the south.

21
°C maximum temperature
8
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
21
°C wind chill
28
kph wind from S

Decatur weather for Tuesday 10th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 65% chance of some rain and a fresh breeze of 29 kph from the south.

23
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
5
UV index (Moderate)
65
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
29
kph wind from S

Decatur weather for Wednesday 11th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 20-30 mm of rainfall expected with 95% chance of some rain and a fresh breeze of 34 kph from the north-west.

19
°C maximum temperature
2
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
1
UV index (Low)
95
% chance of some rain
<30
mm of rainfall expected
19
°C wind chill
34
kph wind from NW

Decatur weather for Thursday 12th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 8°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 31 kph from the south.

8
°C maximum temperature
0
°C minimum temperature
broken clouds
6
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
4
°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 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 32 kph from the south-west.