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.

Thursday
15th Jan
-3

-8

7

2
Friday
16th Jan
4

-2

2

1
Saturday
17th Jan
-3

-10

1

1
Sunday
18th Jan
-5

-13

1

2
Monday
19th Jan
-5

-12

8

2

5-day weather forecast updated at 04:01 on Thursday 15th 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 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 7 hours of bright sunshine. There are 0-2 cm of snow expected with 51% chance of some snow and a moderate breeze of 22 kph from the north-west.

-3
°C maximum temperature
-8
°C minimum temperature
clear skies with flurries of snow
7
hours of sunshine
2
UV index (Low)
51
% chance of some snow
<2
cm of snow expected
-9
°C wind chill
22
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 4°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a moderate breeze of 27 kph from the west.

4
°C maximum temperature
-2
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
1
UV index (Low)
41
% chance of some rain
<2
mm of rainfall expected
-2
°C wind chill
27
kph wind from W

Decatur weather for Saturday 17th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a moderate breeze of 28 kph from the west.

-3
°C maximum temperature
-10
°C minimum temperature
mostly cloudy with light snow
1
hour of sunshine
1
UV index (Low)
25
% chance of some snow
<2
cm of snow expected
-10
°C wind chill
28
kph wind from W

Decatur weather for Sunday 18th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 3% chance of some snow and a moderate breeze of 25 kph from the south-west.

-5
°C maximum temperature
-13
°C minimum temperature
mostly cloudy with light snow
1
hour of sunshine
2
UV index (Low)
3
% chance of some snow
<2
cm of snow expected
-12
°C wind chill
25
kph wind from SW

Decatur weather for Monday 19th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 32 kph from the north-west.