Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 13°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Tuesday
24th Mar
13

0

6

5
Wednesday
25th Mar
21

8

9

7
Thursday
26th Mar
30

10

4

7
Friday
27th Mar
8

1

7

6
Saturday
28th Mar
12

-2

12

6

5-day weather forecast updated at 04:01 on Tuesday 24th 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 Tuesday 24th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 13°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south-east.

13
°C maximum temperature
0
°C minimum temperature
broken clouds
6
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
16
kph wind from SE

Decatur weather for Wednesday 25th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the south.

21
°C maximum temperature
8
°C minimum temperature
broken clouds
9
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
21
°C wind chill
22
kph wind from S

Decatur weather for Thursday 26th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 97% chance of some rain and a fresh breeze of 31 kph from the south-west.

30
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
7
UV index (High)
97
% chance of some rain
<10
mm of rainfall expected
M
moderate 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 6 (High) and 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 28% chance of some rain and a fresh breeze of 31 kph from the north.

8
°C maximum temperature
1
°C minimum temperature
sunshine and showers
7
hours of sunshine
6
UV index (High)
28
% chance of some rain
<10
mm of rainfall expected
4
°C wind chill
31
kph wind from N

Decatur weather for Saturday 28th March 2026

Expect clear skies in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north-west.