Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 22°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
25th Mar
22

5

6

6
Thursday
26th Mar
29

9

6

7
Friday
27th Mar
8

1

9

7
Saturday
28th Mar
11

-2

11

6
Sunday
29th Mar
16

3

1

1

5-day weather forecast updated at 04:01 on Wednesday 25th March 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 Wednesday 25th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 22°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a moderate breeze of 24 kph from the south.

22
°C maximum temperature
5
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
42
% chance of some rain
<2
mm of rainfall expected
22
°C wind chill
24
kph wind from S

Decatur weather for Thursday 26th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 94% chance of some rain and a fresh breeze of 31 kph from the south-west.

29
°C maximum temperature
9
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
94
% chance of some rain
<20
mm of rainfall expected
L
low heat & humidity
31
kph wind from SW

Decatur weather for Friday 27th March 2026

Expect sunshine and showers in Decatur, Illinois with a maximum temperature of 8°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 5-10 mm of rainfall expected with 18% chance of some rain and a fresh breeze of 30 kph from the north.

8
°C maximum temperature
1
°C minimum temperature
sunshine and showers
9
hours of sunshine
7
UV index (High)
18
% chance of some rain
<10
mm of rainfall expected
4
°C wind chill
30
kph wind from N

Decatur weather for Saturday 28th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

11
°C maximum temperature
-2
°C minimum temperature
scattered clouds
11
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
11
°C wind chill
15
kph wind from S

Decatur weather for Sunday 29th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 25 kph from the south.