Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 16°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
9th Jan
16

5

2

2
Saturday
10th Jan
6

-1

2

2
Sunday
11th Jan
1

-5

2

2
Monday
12th Jan
6

-4

6

2
Tuesday
13th Jan
10

1

8

1

5-day weather forecast updated at 04:01 on Friday 9th 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 Friday 9th January 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 5% chance of some rain and a fresh breeze of 32 kph from the west.

16
°C maximum temperature
5
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
2
UV index (Low)
5
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
32
kph wind from W

Decatur weather for Saturday 10th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 6°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the west.

6
°C maximum temperature
-1
°C minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
1
°C wind chill
28
kph wind from W

Decatur weather for Sunday 11th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 1°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 29 kph from the north-west.

1
°C maximum temperature
-5
°C minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-5
°C wind chill
29
kph wind from NW

Decatur weather for Monday 12th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 6°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-west.

6
°C maximum temperature
-4
°C minimum temperature
scattered clouds
6
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
2
°C wind chill
24
kph wind from SW

Decatur weather for Tuesday 13th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-west.