Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 2°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Sunday
21st Dec
2

-4

8

2
Monday
22nd Dec
7

-1

3

1
Tuesday
23rd Dec
12

3

1

2
Wednesday
24th Dec
15

3

1

0
Thursday
25th Dec
18

15

2

1

5-day weather forecast updated at 04:01 on Sunday 21st December 2025 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 Sunday 21st December 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 2°C, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south-east.

2
°C maximum temperature
-4
°C minimum temperature
scattered clouds
8
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-3
°C wind chill
16
kph wind from SE

Decatur weather for Monday 22nd December 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 7°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a moderate breeze of 21 kph from the south.

7
°C maximum temperature
-1
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
1
UV index (Low)
12
% chance of some rain
<2
mm of rainfall expected
3
°C wind chill
21
kph wind from S

Decatur weather for Tuesday 23rd December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south-west.

12
°C maximum temperature
3
°C minimum temperature
broken clouds
1
hour of sunshine
2
UV index (Low)
0
mm of rainfall expected
12
°C wind chill
19
kph wind from SW

Decatur weather for Wednesday 24th December 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 15°C and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 22% chance of some rain and a gentle breeze of 19 kph from the south.

15
°C maximum temperature
3
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
0
UV index (None)
22
% chance of some rain
<2
mm of rainfall expected
15
°C wind chill
19
kph wind from S

Decatur weather for Thursday 25th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 18°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south-west.