Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 32°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
12th Oct
32

18

10

5
Tuesday
13th Oct
32

20

9

6
Wednesday
14th Oct
25

16

0

4
Thursday
15th Oct
23

14

0

2
Friday
16th Oct
15

4

7

5

5-day weather forecast updated at 04:01 on Tuesday 13th October 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 Monday 12th October 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the south-west.

32
°C maximum temperature
18
°C minimum temperature
scattered clouds
10
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
M
moderate heat & humidity
23
kph wind from SW

Decatur weather for Tuesday 13th October 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 27% chance of some rain and a gentle breeze of 18 kph from the south-west.

32
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
6
UV index (High)
27
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
18
kph wind from SW

Decatur weather for Wednesday 14th October 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 92% chance of some rain and a gentle breeze of 16 kph from the north-east.

25
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
4
UV index (Moderate)
92
% chance of some rain
<20
mm of rainfall expected
25
°C wind chill
16
kph wind from NE

Decatur weather for Thursday 15th October 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 23°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 91% chance of some rain and a moderate breeze of 21 kph from the west.

23
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
2
UV index (Low)
91
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
21
kph wind from W

Decatur weather for Friday 16th October 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 33 kph from the north-west.