Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 20°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

Wednesday
11th Mar
20

2

1

3
Thursday
12th Mar
9

0

10

4
Friday
13th Mar
12

3

9

4
Saturday
14th Mar
11

2

1

4
Sunday
15th Mar
16

0

0

1

5-day weather forecast updated at 04:01 on Wednesday 11th 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 Wednesday 11th March 2026

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 20-30 mm of rainfall expected with 77% chance of some rain and a fresh breeze of 34 kph from the north-west.

20
°C maximum temperature
2
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
3
UV index (Moderate)
77
% chance of some rain
<30
mm of rainfall expected
0
no heat & humidity
34
kph wind from NW

Decatur weather for Thursday 12th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 9°C, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 35 kph from the south.

9
°C maximum temperature
0
°C minimum temperature
scattered clouds
10
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
5
°C wind chill
35
kph wind from S

Decatur weather for Friday 13th March 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 39 kph from the west.

12
°C maximum temperature
3
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
12
°C wind chill
39
kph wind from W

Decatur weather for Saturday 14th March 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of 11°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the south-east.

11
°C maximum temperature
2
°C minimum temperature
broken clouds
1
hour of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
24
kph wind from SE

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 1 (Low) and no hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 88% chance of some sleet or snow and a fresh breeze of 38 kph from the south.