Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 10°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Saturday
28th Mar
10

1

12

6
Sunday
29th Mar
16

6

2

3
Monday
30th Mar
25

13

7

6
Tuesday
31st Mar
26

11

5

5
Wednesday
1st Apr
10

3

5

5

5-day weather forecast updated at 04:01 on Saturday 28th 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 Saturday 28th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south.

10
°C maximum temperature
1
°C minimum temperature
scattered clouds
12
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
19
kph wind from S

Decatur weather for Sunday 29th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south.

16
°C maximum temperature
6
°C minimum temperature
broken clouds
2
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
16
°C wind chill
24
kph wind from S

Decatur weather for Monday 30th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 32 kph from the south.

25
°C maximum temperature
13
°C minimum temperature
broken clouds
7
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
32
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 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 77% chance of some rain and a fresh breeze of 36 kph from the south-west.

26
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
5
UV index (Moderate)
77
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
36
kph wind from SW

Decatur weather for Wednesday 1st April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 73% chance of some rain and a moderate breeze of 27 kph from the north-east.