Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 7°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Saturday
20th Dec
7

-2

4

2
Sunday
21st Dec
1

-2

9

2
Monday
22nd Dec
7

-2

5

1
Tuesday
23rd Dec
11

5

0

2
Wednesday
24th Dec
15

5

0

1

5-day weather forecast updated at 04:01 on Saturday 20th 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 Saturday 20th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 7°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south.

7
°C maximum temperature
-2
°C minimum temperature
broken clouds
4
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
4
°C wind chill
27
kph wind from S

Decatur weather for Sunday 21st December 2025

Expect clear skies in Decatur, Illinois with a maximum temperature of 1°C, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the north-west.

1
°C maximum temperature
-2
°C minimum temperature
clear skies
9
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-4
°C wind chill
17
kph wind from NW

Decatur weather for Monday 22nd December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 7°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south.

7
°C maximum temperature
-2
°C minimum temperature
broken clouds
5
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
3
°C wind chill
21
kph wind from S

Decatur weather for Tuesday 23rd December 2025

Expect overcast skies in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south-west.

11
°C maximum temperature
5
°C minimum temperature
overcast skies
0
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
11
°C wind chill
20
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, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 31% chance of some rain and a moderate breeze of 20 kph from the south.