Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be -1°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Monday
16th Mar
-1

-8

2

3
Tuesday
17th Mar
-2

-10

6

4
Wednesday
18th Mar
11

-3

11

5
Thursday
19th Mar
16

4

9

5
Friday
20th Mar
21

6

5

4

5-day weather forecast updated at 04:01 on Monday 16th 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 Monday 16th March 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -1°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 22% chance of some snow and a strong breeze of 40 kph from the north-west.

-1
°C maximum temperature
-8
°C minimum temperature
mostly cloudy with light snow
2
hours of sunshine
3
UV index (Moderate)
22
% chance of some snow
<2
cm of snow expected
-8
°C wind chill
40
kph wind from NW

Decatur weather for Tuesday 17th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 27 kph from the north-west.

-2
°C maximum temperature
-10
°C minimum temperature
broken clouds
6
hours of sunshine
4
UV index (Moderate)
0
cm of snow expected
-9
°C wind chill
27
kph wind from NW

Decatur weather for Wednesday 18th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the south.

11
°C maximum temperature
-3
°C minimum temperature
broken clouds
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
11
°C wind chill
27
kph wind from S

Decatur weather for Thursday 19th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south.

16
°C maximum temperature
4
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
16
°C wind chill
17
kph wind from S

Decatur weather for Friday 20th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south-west.