Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 29°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Sunday
12th Jul
29

20

13

9
Monday
13th Jul
29

18

14

9
Tuesday
14th Jul
31

20

14

9
Wednesday
15th Jul
32

21

13

9
Thursday
16th Jul
32

22

10

9

5-day weather forecast updated at 04:01 on Sunday 12th July 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 12th July 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the north-east.

29
°C maximum temperature
20
°C minimum temperature
clear skies
13
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
20
kph wind from NE

Decatur weather for Monday 13th July 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north-east.

29
°C maximum temperature
18
°C minimum temperature
clear skies
14
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from NE

Decatur weather for Tuesday 14th July 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the north-east.

31
°C maximum temperature
20
°C minimum temperature
clear skies
14
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
10
kph wind from NE

Decatur weather for Wednesday 15th July 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 32°C, high levels of heat & humidity, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the north-west.

32
°C maximum temperature
21
°C minimum temperature
scattered clouds
13
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
8
kph wind from NW

Decatur weather for Thursday 16th July 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.