Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 18°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Sunday
1st Nov
18

11

0

1
Monday
2nd Nov
16

11

0

1
Tuesday
3rd Nov
20

14

0

1
Wednesday
4th Nov
18

9

0

0
Thursday
5th Nov
15

9

1

3

5-day weather forecast updated at 04:01 on Sunday 1st November 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 1st November 2026

Expect overcast skies in Decatur, Illinois with a maximum temperature of 18°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south-east.

18
°C maximum temperature
11
°C minimum temperature
overcast skies
0
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
18
°C wind chill
16
kph wind from SE

Decatur weather for Monday 2nd November 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 26% chance of some rain and a moderate breeze of 25 kph from the south.

16
°C maximum temperature
11
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
1
UV index (Low)
26
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
25
kph wind from S

Decatur weather for Tuesday 3rd November 2026

Expect mostly cloudy with rain in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 92% chance of some rain and a fresh breeze of 31 kph from the south.

20
°C maximum temperature
14
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
1
UV index (Low)
92
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
31
kph wind from S

Decatur weather for Wednesday 4th November 2026

Expect cloudy with some rain in Decatur, Illinois with a maximum temperature of 18°C and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 36% chance of some rain and a moderate breeze of 22 kph from the south.

18
°C maximum temperature
9
°C minimum temperature
cloudy with some rain
0
hours of sunshine
0
UV index (None)
36
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
22
kph wind from S

Decatur weather for Thursday 5th November 2026

Expect overcast skies in Decatur, Illinois with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.