Decatur weather live forecast

Tomorrow's maximum temperature in Decatur is expected to be 28°C.

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 Monday 16th June 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 48% chance of some rain and little or no wind of 5 kph from the south.

  • 28°C maximum temperature28
    °C maximum temperature
  • 22°C minimum temperature22
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 48% chance of some rain48
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Little or no wind of 5 kph from the South5
    kph wind from S

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Decatur weather for Tuesday 17th June 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 29°C, 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 5 kph from the south-west.

  • 29°C maximum temperature29
    °C maximum temperature
  • 21°C minimum temperature21
    °C 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 5 kph from the South-West5
    kph 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 28°C, 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 16 kph from the south-west.

  • 28°C maximum temperature28
    °C maximum temperature
  • 21°C minimum temperature21
    °C 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 16 kph from the South-West16
    kph 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 28°C, 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 8 kph from the west.

  • 28°C maximum temperature28
    °C maximum temperature
  • 20°C minimum temperature20
    °C 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 8 kph from the West8
    kph 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 30°C, 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 11 kph from the south.

  • 30°C maximum temperature30
    °C maximum temperature
  • 19°C minimum temperature19
    °C 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 11 kph from the South11
    kph wind from S

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

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