Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 24°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Saturday
9th May
24

11

11

7
Sunday
10th May
19

10

11

7
Monday
11th May
21

9

12

7
Tuesday
12th May
25

10

7

5
Wednesday
13th May
20

10

12

6

5-day weather forecast updated at 04:01 on Sunday 10th May 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 Saturday 9th May 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the south-west.

24
°C maximum temperature
11
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
26
kph wind from SW

Decatur weather for Sunday 10th May 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north.

19
°C maximum temperature
10
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
19
°C wind chill
18
kph wind from N

Decatur weather for Monday 11th May 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the west.

21
°C maximum temperature
9
°C minimum temperature
scattered clouds
12
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
21
°C wind chill
17
kph wind from W

Decatur weather for Tuesday 12th May 2026

Expect sunshine and showers in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 54% chance of some rain and a fresh breeze of 32 kph from the south-west.

25
°C maximum temperature
10
°C minimum temperature
sunshine and showers
7
hours of sunshine
5
UV index (Moderate)
54
% chance of some rain
<5
mm of rainfall expected
25
°C wind chill
32
kph wind from SW

Decatur weather for Wednesday 13th May 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the north-west.