Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 27°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
13th Apr
27

18

7

4
Tuesday
14th Apr
28

18

6

5
Wednesday
15th Apr
25

20

4

5
Thursday
16th Apr
27

18

13

7
Friday
17th Apr
29

14

7

6

5-day weather forecast updated at 04:01 on Monday 13th April 2026 GMT

More about Decatur

Decatur by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Illinois

TUI: Top deals & discounts on 2026/2027 holidays

Sale

Explore latest special offers & online deals from TUI
Free child places & £0 deposits with direct debit available
Book summer & winter sun holidays in 2026/2027

Go to TUI deal >>

View all TUI offers

TUI deal finder

Destination

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 13th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 30 kph from the south-west.

27
°C maximum temperature
18
°C minimum temperature
broken clouds
7
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
30
kph wind from SW

Decatur weather for Tuesday 14th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a fresh breeze of 30 kph from the south-west.

28
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
5
UV index (Moderate)
42
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
30
kph wind from SW

Decatur weather for Wednesday 15th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 89% chance of some rain and a moderate breeze of 28 kph from the south-west.

25
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
5
UV index (Moderate)
89
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
28
kph wind from SW

Decatur weather for Thursday 16th April 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0-2 mm of rainfall expected with 30% chance of some rain and a moderate breeze of 27 kph from the south-west.

27
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
13
hours of sunshine
7
UV index (High)
30
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
27
kph wind from SW

Decatur weather for Friday 17th April 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 30 kph from the south.