Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 1°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
2nd Jan
1

-4

2

2
Saturday
3rd Jan
2

-4

3

2
Sunday
4th Jan
2

-5

4

2
Monday
5th Jan
8

-1

9

2
Tuesday
6th Jan
12

3

6

2

5-day weather forecast updated at 04:01 on Friday 2nd January 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 Friday 2nd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 1°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-east.

1
°C maximum temperature
-4
°C minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-3
°C wind chill
14
kph wind from NE

Decatur weather for Saturday 3rd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 2°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-east.

2
°C maximum temperature
-4
°C minimum temperature
broken clouds
3
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-2
°C wind chill
14
kph wind from NE

Decatur weather for Sunday 4th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 2°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south.

2
°C maximum temperature
-5
°C minimum temperature
broken clouds
4
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-2
°C wind chill
20
kph wind from S

Decatur weather for Monday 5th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 8°C, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south.

8
°C maximum temperature
-1
°C minimum temperature
scattered clouds
9
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
4
°C wind chill
21
kph wind from S

Decatur weather for Tuesday 6th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south.