Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be -5°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Tuesday
2nd Dec
-5

-7

2

2
Wednesday
3rd Dec
0

-6

0

2
Thursday
4th Dec
-7

-15

10

2
Friday
5th Dec
-3

-14

4

2
Saturday
6th Dec
-2

-4

3

2

5-day weather forecast updated at 04:01 on Tuesday 2nd 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 Tuesday 2nd December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 2 kph from the north-west.

-5
°C maximum temperature
-7
°C minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
cm of snow expected
0
no heat & humidity
2
kph wind from NW

Decatur weather for Wednesday 3rd December 2025

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of 0°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 33% chance of some snow and little or no wind of 5 kph from the south.

0
°C maximum temperature
-6
°C minimum temperature
mostly cloudy with light snow
0
hours of sunshine
2
UV index (Low)
33
% chance of some snow
<2
cm of snow expected
-1
°C wind chill
5
kph wind from S

Decatur weather for Thursday 4th December 2025

Expect clear skies in Decatur, Illinois with a maximum temperature of -7°C, maximum UV of 2 (Low) and 10 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 5 kph from the north.

-7
°C maximum temperature
-15
°C minimum temperature
clear skies
10
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-9
°C wind chill
5
kph wind from N

Decatur weather for Friday 5th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 3 kph from the south.

-3
°C maximum temperature
-14
°C minimum temperature
broken clouds
4
hours of sunshine
2
UV index (Low)
0
cm of snow expected
0
no heat & humidity
3
kph wind from S

Decatur weather for Saturday 6th December 2025

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 cm of snow expected and little or no wind of 2 kph from the north-west.

-2
°C maximum temperature
-4
°C minimum temperature
broken clouds
3
hours of sunshine
2
UV index (Low)
0
cm of snow expected
0
no heat & humidity
2
kph wind from NW

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Metric (°C / mm) | Imperial (°F / inches)

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Illinois - quick facts
Flight time^✝	8.5 hours
Time difference	UK -6 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Culture
Tourist info	Illinois Department of Commerce & Economic Opportunity