Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 23°F. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Saturday
13th Dec
23

0

0

1
Sunday
14th Dec
1

-6

9

2
Monday
15th Dec
23

-6

1

3
Tuesday
16th Dec
36

21

9

2
Wednesday
17th Dec
41

32

3

2

5-day weather forecast updated at 04:01 on Friday 12th 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 13th December 2025

Expect mostly cloudy with snow in Decatur, Illinois with a maximum temperature of 23°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 cm of snow expected with 100% chance of some snow and a moderate breeze of 12 mph from the north-west.

23
°F maximum temperature
0
°F minimum temperature
mostly cloudy with snow
0
hours of sunshine
1
UV index (Low)
100
% chance of some snow
<10
cm of snow expected
12
°F wind chill
12
mph wind from NW

Decatur weather for Sunday 14th December 2025

Expect clear skies in Decatur, Illinois with a maximum temperature of 1°F, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 12 mph from the north-west.

1
°F maximum temperature
-6
°F minimum temperature
clear skies
9
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-15
°F wind chill
12
mph wind from NW

Decatur weather for Monday 15th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 23°F, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 15 mph from the south.

23
°F maximum temperature
-6
°F minimum temperature
broken clouds
1
hour of sunshine
3
UV index (Moderate)
0
cm of snow expected
10
°F wind chill
15
mph wind from S

Decatur weather for Tuesday 16th December 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 36°F, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 15 mph from the south.

36
°F maximum temperature
21
°F minimum temperature
scattered clouds
9
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
27
°F wind chill
15
mph wind from S

Decatur weather for Wednesday 17th December 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 41°F, maximum UV of 2 (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 14 mph from the south.