Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 17°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Friday
26th Dec
17

8

0

1
Saturday
27th Dec
15

7

3

2
Sunday
28th Dec
17

-2

0

0
Monday
29th Dec
-3

-7

9

2
Tuesday
30th Dec
-2

-7

5

2

5-day weather forecast updated at 04:01 on Thursday 25th December 2025 GMT

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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 Friday 26th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 17°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the north-west.

17
°C maximum temperature
8
°C minimum temperature
broken clouds
0
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
23
kph wind from NW

Decatur weather for Saturday 27th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 15°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the south-east.

15
°C maximum temperature
7
°C minimum temperature
broken clouds
3
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
20
kph wind from SE

Decatur weather for Sunday 28th December 2025

Expect cloudy with sleet or snow in Decatur, Illinois with a maximum temperature of 17°C and no hours of bright sunshine. There are 10-20 mm of sleet/snow expected with 82% chance of some sleet or snow and a fresh breeze of 35 kph from the north-west.

17
°C maximum temperature
-2
°C minimum temperature
cloudy with sleet or snow
0
hours of sunshine
0
UV index (None)
82
% chance of some sleet or snow
<20
mm of sleet/snow expected
0
no heat & humidity
35
kph wind from NW

Decatur weather for Monday 29th December 2025

Expect clear skies in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 34 kph from the north-west.

-3
°C maximum temperature
-7
°C minimum temperature
clear skies
9
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-11
°C wind chill
34
kph wind from NW

Decatur weather for Tuesday 30th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 23 kph from the west.