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.

Sunday
25th Jan
-11

-18

0

3
Monday
26th Jan
-14

-22

8

3
Tuesday
27th Jan
-6

-19

5

3
Wednesday
28th Jan
-7

-20

3

2
Thursday
29th Jan
-11

-18

4

3

5-day weather forecast updated at 04:01 on Sunday 25th 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 Sunday 25th January 2026

Expect mostly cloudy with snow in Decatur, Illinois with a maximum temperature of -11°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 5-10 cm of snow expected with 90% chance of some snow and a moderate breeze of 25 kph from the north.

-11
°C maximum temperature
-18
°C minimum temperature
mostly cloudy with snow
0
hours of sunshine
3
UV index (Moderate)
90
% chance of some snow
<10
cm of snow expected
-20
°C wind chill
25
kph wind from N

Decatur weather for Monday 26th January 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of -14°C, maximum UV of 3 (Moderate) and 8 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 27 kph from the north-west.

-14
°C maximum temperature
-22
°C minimum temperature
clear skies
8
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
-24
°C wind chill
27
kph wind from NW

Decatur weather for Tuesday 27th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of -6°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 28 kph from the north-west.

-6
°C maximum temperature
-19
°C minimum temperature
scattered clouds
5
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
-14
°C wind chill
28
kph wind from NW

Decatur weather for Wednesday 28th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -7°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 41% chance of some snow and a moderate breeze of 20 kph from the west.

-7
°C maximum temperature
-20
°C minimum temperature
mostly cloudy with light snow
3
hours of sunshine
2
UV index (Low)
41
% chance of some snow
<2
cm of snow expected
-14
°C wind chill
20
kph wind from W

Decatur weather for Thursday 29th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -11°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 15 kph from the north-west.