Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 26°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Thursday
16th Apr
26

16

11

6
Friday
17th Apr
28

14

7

6
Saturday
18th Apr
20

7

11

5
Sunday
19th Apr
16

4

13

6
Monday
20th Apr
20

5

14

7

5-day weather forecast updated at 04:01 on Thursday 16th April 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 Thursday 16th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 2-5 mm of rainfall expected with 8% chance of some rain and a moderate breeze of 26 kph from the west.

26
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
6
UV index (High)
8
% chance of some rain
<5
mm of rainfall expected
26
°C wind chill
26
kph wind from W

Decatur weather for Friday 17th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 68% chance of some rain and a fresh breeze of 32 kph from the south.

28
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
6
UV index (High)
68
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
32
kph wind from S

Decatur weather for Saturday 18th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 10-20 mm of rainfall expected with 41% chance of some rain and a fresh breeze of 31 kph from the north-west.

20
°C maximum temperature
7
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
5
UV index (Moderate)
41
% chance of some rain
<20
mm of rainfall expected
20
°C wind chill
31
kph wind from NW

Decatur weather for Sunday 19th April 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the north-west.

16
°C maximum temperature
4
°C minimum temperature
scattered clouds
13
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
16
°C wind chill
25
kph wind from NW

Decatur weather for Monday 20th April 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the south.