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Decatur weather live forecast
Today's maximum temperature in Decatur is expected to be 13°C. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.
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Saturday
25th Oct
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Sunday
26th Oct
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Monday
27th Oct -
Tuesday
28th Oct -
Wednesday
29th Oct
5-day weather forecast updated at 04:01 on Saturday 25th October 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 Saturday 25th October 2025
Expect overcast skies in Decatur, Illinois with a maximum temperature of 13°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
overcast skies
- hours of sunshine
- UV index (Low)
- mm of rainfall expected
- no heat & humidity
- kph wind from E
Decatur weather for Sunday 26th October 2025
Expect broken clouds in Decatur, Illinois with a maximum temperature of 16°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the east.
- °C maximum temperature
- °C minimum temperature
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broken clouds
- hour of sunshine
- UV index (Moderate)
- mm of rainfall expected
- °C wind chill
- kph wind from E
Decatur weather for Monday 27th October 2025
Expect overcast skies in Decatur, Illinois with a maximum temperature of 15°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
overcast skies
- hours of sunshine
- UV index (Moderate)
- mm of rainfall expected
- no heat & humidity
- kph wind from E
Decatur weather for Tuesday 28th October 2025
Expect overcast skies in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the east.
- °C maximum temperature
- °C minimum temperature
-
overcast skies
- hours of sunshine
- UV index (Low)
- mm of rainfall expected
- no heat & humidity
- kph wind from E
Decatur weather for Wednesday 29th October 2025
Expect overcast skies in Decatur, Illinois with a maximum temperature of 12°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-east.
- °C maximum temperature
- °C minimum temperature
-
overcast skies
- hour of sunshine
- UV index (Low)
- mm of rainfall expected
- no heat & humidity
- kph wind from NE
- Book online with TUI & save up to 8% on holidays
- FREE child places available for select holidays
- Pay £0 deposits with direct debit & spread the cost
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Metric (°C / mm) | Imperial (°F / inches)
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