Decatur weather live forecast

Tomorrow's maximum temperature in Decatur is expected to be 21°C.

5-day weather forecast updated at 04:01 on Tuesday 27th May 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 Tuesday 27th May 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 21°C, maximum UV of 8 (Very High) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 28% chance of some rain and a light breeze of 8 kph from the north-east.

  • 21°C maximum temperature21
    °C maximum temperature
  • 15°C minimum temperature15
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 28% chance of some rain28
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 8 kph from the North-East8
    kph wind from NE

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Decatur weather for Wednesday 28th May 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 22°C, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the north-west.

  • 22°C maximum temperature22
    °C maximum temperature
  • 15°C minimum temperature15
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Little or no wind of 6 kph from the North-West6
    kph wind from NW

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Decatur weather for Thursday 29th May 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 22°C, maximum UV of 6 (High) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 2 kph from the north.

  • 22°C maximum temperature22
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Little or no wind of 2 kph from the North2
    kph wind from N

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Decatur weather for Friday 30th May 2025

Expect sunshine and showers in Decatur, Illinois with a maximum temperature of 24°C, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 11% chance of some rain and a light breeze of 9 kph from the north-west.

  • 24°C maximum temperature24
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 11% chance of some rain11
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 9 kph from the North-West9
    kph wind from NW

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Decatur weather for Saturday 31st May 2025

Expect sunshine and showers in Decatur, Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a light breeze of 10 kph from the north-west.

  • 28°C maximum temperature28
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 42% chance of some rain42
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 10 kph from the North-West10
    kph wind from NW

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Metric (°C / mm)  |  Imperial (°F / inches)

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