Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 10°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Thursday
12th Mar
10

0

9

4
Friday
13th Mar
11

3

9

4
Saturday
14th Mar
11

2

1

3
Sunday
15th Mar
16

-1

1

2
Monday
16th Mar
-2

-9

11

4

5-day weather forecast updated at 04:01 on Thursday 12th March 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 12th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 10°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 36 kph from the south.

10
°C maximum temperature
0
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
6
°C wind chill
36
kph wind from S

Decatur weather for Friday 13th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 38 kph from the west.

11
°C maximum temperature
3
°C minimum temperature
broken clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
11
°C wind chill
38
kph wind from W

Decatur weather for Saturday 14th March 2026

Expect overcast skies in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the east.

11
°C maximum temperature
2
°C minimum temperature
overcast skies
1
hour of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
22
kph wind from E

Decatur weather for Sunday 15th March 2026

Expect cloudy with sleet or snow in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of sleet/snow expected with 85% chance of some sleet or snow and a strong breeze of 40 kph from the south.

16
°C maximum temperature
-1
°C minimum temperature
cloudy with sleet or snow
1
hour of sunshine
2
UV index (Low)
85
% chance of some sleet or snow
<20
mm of sleet/snow expected
16
°C wind chill
40
kph wind from S

Decatur weather for Monday 16th March 2026

Expect clear skies with flurries of snow in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0-2 cm of snow expected with 36% chance of some snow and a strong breeze of 40 kph from the north-west.