Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 8°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
22nd Dec
8

-3

5

1
Tuesday
23rd Dec
11

5

3

2
Wednesday
24th Dec
15

5

2

0
Thursday
25th Dec
17

14

1

1
Friday
26th Dec
19

12

4

1

5-day weather forecast updated at 04:01 on Monday 22nd 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 Monday 22nd December 2025

Expect sunshine and showers in Decatur, Illinois with a maximum temperature of 8°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 13% chance of some rain and a moderate breeze of 21 kph from the south.

8
°C maximum temperature
-3
°C minimum temperature
sunshine and showers
5
hours of sunshine
1
UV index (Low)
13
% chance of some rain
<2
mm of rainfall expected
4
°C wind chill
21
kph wind from S

Decatur weather for Tuesday 23rd December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the south-west.

11
°C maximum temperature
5
°C minimum temperature
broken clouds
3
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
18
kph wind from SW

Decatur weather for Wednesday 24th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 15°C and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the south-east.

15
°C maximum temperature
5
°C minimum temperature
broken clouds
2
hours of sunshine
0
UV index (None)
0
mm of rainfall expected
0
no heat & humidity
18
kph wind from SE

Decatur weather for Thursday 25th December 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 17°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a moderate breeze of 26 kph from the south-west.

17
°C maximum temperature
14
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
1
UV index (Low)
34
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
26
kph wind from SW

Decatur weather for Friday 26th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the west.