Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 3°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
21st Jan
3

-2

8

2
Thursday
22nd Jan
-1

-6

0

2
Friday
23rd Jan
-7

-18

5

2
Saturday
24th Jan
-12

-19

2

2
Sunday
25th Jan
-8

-14

0

2

5-day weather forecast updated at 04:01 on Wednesday 21st January 2026 GMT

More about Decatur

Decatur by month

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

Recommended for Illinois

TUI sale: 10% off 2026/2027 holidays

Discount Code

Save 10% on 2026/2027 holidays in biggest ever TUI sale
Max discount £500. T&Cs apply. £500 min spend
Travel between 1st May 2026 & 31st Oct 2027 (inclusive)

Show discount code

******ALE

Redeem TUI discount code >>

Expires at 23:59 on Saturday 31st Jan 2026 · 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 21st January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 3°C, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the west.

3
°C maximum temperature
-2
°C minimum temperature
scattered clouds
8
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
-2
°C wind chill
26
kph wind from W

Decatur weather for Thursday 22nd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -1°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 24 kph from the west.

-1
°C maximum temperature
-6
°C minimum temperature
broken clouds
0
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-7
°C wind chill
24
kph wind from W

Decatur weather for Friday 23rd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -7°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 26 kph from the north.

-7
°C maximum temperature
-18
°C minimum temperature
broken clouds
5
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-15
°C wind chill
26
kph wind from N

Decatur weather for Saturday 24th January 2026

Expect mostly cloudy with snow in Decatur, Illinois with a maximum temperature of -12°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 5-10 cm of snow expected with 32% chance of some snow and a gentle breeze of 17 kph from the north-east.

-12
°C maximum temperature
-19
°C minimum temperature
mostly cloudy with snow
2
hours of sunshine
2
UV index (Low)
32
% chance of some snow
<10
cm of snow expected
-19
°C wind chill
17
kph wind from NE

Decatur weather for Sunday 25th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -8°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 24% chance of some snow and a gentle breeze of 17 kph from the north-west.