Decatur weather live forecast

Tomorrow's maximum temperature in Decatur is expected to be 84°F.

5-day weather forecast updated at 04:01 on Tuesday 17th June 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 17th June 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and little or no wind of 3 mph from the south-west.

  • 84°F maximum temperature84
    °F maximum temperature
  • 70°F minimum temperature70
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Little or no wind of 3 mph from the South-West3
    mph wind from SW

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Decatur weather for Wednesday 18th June 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 30-40 mm of rainfall expected with 89% chance of some rain and a gentle breeze of 10 mph from the south-west.

  • 82°F maximum temperature82
    °F maximum temperature
  • 70°F minimum temperature70
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 89% chance of some rain89
    % chance of some rain
  • 30-40 mm of rainfall expected<40
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 10 mph from the South-West10
    mph wind from SW

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Decatur weather for Thursday 19th June 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 7% chance of some rain and a light breeze of 5 mph from the west.

  • 82°F maximum temperature82
    °F maximum temperature
  • 68°F minimum temperature68
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 7% chance of some rain7
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 5 mph from the West5
    mph wind from W

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Decatur weather for Friday 20th June 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south.

  • 86°F maximum temperature86
    °F maximum temperature
  • 66°F minimum temperature66
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 7 mph from the South7
    mph wind from S

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Decatur weather for Saturday 21st June 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 91°F, high levels of heat & humidity, maximum UV of 9 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south.

  • 91°F maximum temperature91
    °F maximum temperature
  • 73°F minimum temperature73
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 9 mph from the South9
    mph wind from S

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  • FREE child places available for select holidays
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