Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 11°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Thursday
18th Dec
11

-5

1

0
Friday
19th Dec
-1

-7

9

2
Saturday
20th Dec
7

-1

0

2
Sunday
21st Dec
1

-3

9

2
Monday
22nd Dec
5

-2

3

0

5-day weather forecast updated at 04:01 on Thursday 18th 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 Thursday 18th December 2025

Expect cloudy with sleet or snow in Decatur, Illinois with a maximum temperature of 11°C and 1 hour of bright sunshine. There are 5-10 mm of sleet/snow expected with 89% chance of some sleet or snow and a fresh breeze of 35 kph from the west.

11
°C maximum temperature
-5
°C minimum temperature
cloudy with sleet or snow
1
hour of sunshine
0
UV index (None)
89
% chance of some sleet or snow
<10
mm of sleet/snow expected
11
°C wind chill
35
kph wind from W

Decatur weather for Friday 19th 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 cm of snow expected and a fresh breeze of 35 kph from the west.

-1
°C maximum temperature
-7
°C minimum temperature
clear skies
9
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-9
°C wind chill
35
kph wind from W

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 no hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the south.

7
°C maximum temperature
-1
°C minimum temperature
broken clouds
0
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
3
°C wind chill
28
kph wind from S

Decatur weather for Sunday 21st December 2025

Expect scattered clouds 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 19 kph from the north-west.

1
°C maximum temperature
-3
°C minimum temperature
scattered clouds
9
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-4
°C wind chill
19
kph wind from NW

Decatur weather for Monday 22nd December 2025

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of 5°C and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 10% chance of some snow and a moderate breeze of 21 kph from the south-east.