Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 6°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
20th Feb
6

-2

7

3
Saturday
21st Feb
4

-4

11

3
Sunday
22nd Feb
-2

-7

7

3
Monday
23rd Feb
0

-8

6

3
Tuesday
24th Feb
6

-7

7

3

5-day weather forecast updated at 04:02 on Friday 20th February 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 Friday 20th February 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 39 kph from the west.

6
°C maximum temperature
-2
°C minimum temperature
broken clouds
7
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
0
°C wind chill
39
kph wind from W

Decatur weather for Saturday 21st February 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 4°C, maximum UV of 3 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the north-west.

4
°C maximum temperature
-4
°C minimum temperature
scattered clouds
11
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
-1
°C wind chill
23
kph wind from NW

Decatur weather for Sunday 22nd February 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 32 kph from the north-west.

-2
°C maximum temperature
-7
°C minimum temperature
scattered clouds
7
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
-9
°C wind chill
32
kph wind from NW

Decatur weather for Monday 23rd February 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 0°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 24 kph from the north-west.

0
°C maximum temperature
-8
°C minimum temperature
scattered clouds
6
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
-6
°C wind chill
24
kph wind from NW

Decatur weather for Tuesday 24th February 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 6°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 30 kph from the south.