Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 7°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
14th Jan
7

-6

3

1
Thursday
15th Jan
-3

-8

9

2
Friday
16th Jan
3

-3

2

1
Saturday
17th Jan
-4

-12

1

1
Sunday
18th Jan
-5

-14

1

2

5-day weather forecast updated at 04:02 on Wednesday 14th January 2026 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 Wednesday 14th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 7°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 35 kph from the north-west.

7
°C maximum temperature
-6
°C minimum temperature
broken clouds
3
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
2
°C wind chill
35
kph wind from NW

Decatur weather for Thursday 15th January 2026

Expect clear skies with flurries of snow in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0-2 cm of snow expected with 66% chance of some snow and a moderate breeze of 25 kph from the north-west.

-3
°C maximum temperature
-8
°C minimum temperature
clear skies with flurries of snow
9
hours of sunshine
2
UV index (Low)
66
% chance of some snow
<2
cm of snow expected
-10
°C wind chill
25
kph wind from NW

Decatur weather for Friday 16th January 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 3°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 28% chance of some rain and a fresh breeze of 31 kph from the west.

3
°C maximum temperature
-3
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
1
UV index (Low)
28
% chance of some rain
<2
mm of rainfall expected
-3
°C wind chill
31
kph wind from W

Decatur weather for Saturday 17th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -4°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 31 kph from the west.

-4
°C maximum temperature
-12
°C minimum temperature
broken clouds
1
hour of sunshine
1
UV index (Low)
0
cm of snow expected
-12
°C wind chill
31
kph wind from W

Decatur weather for Sunday 18th January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 23 kph from the west.