Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 3°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
17th Dec
3

0

6

2
Thursday
18th Dec
9

-5

0

0
Friday
19th Dec
-2

-8

6

2
Saturday
20th Dec
5

-2

7

2
Sunday
21st Dec
2

-2

4

2

5-day weather forecast updated at 04:01 on Wednesday 17th 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 Wednesday 17th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 3°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-east.

3
°C maximum temperature
0
°C minimum temperature
broken clouds
6
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-1
°C wind chill
24
kph wind from SE

Decatur weather for Thursday 18th December 2025

Expect overcast with light rain in Decatur, Illinois with a maximum temperature of 9°C and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 35 kph from the west.

9
°C maximum temperature
-5
°C minimum temperature
overcast with light rain
0
hours of sunshine
0
UV index (None)
99
% chance of some rain
<10
mm of rainfall expected
5
°C wind chill
35
kph wind from W

Decatur weather for Friday 19th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 35 kph from the west.

-2
°C maximum temperature
-8
°C minimum temperature
broken clouds
6
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-10
°C wind chill
35
kph wind from W

Decatur weather for Saturday 20th December 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 5°C, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the south.

5
°C maximum temperature
-2
°C minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
°C wind chill
28
kph wind from S

Decatur weather for Sunday 21st December 2025

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 gentle breeze of 16 kph from the north.