Decatur weather live forecast

Tomorrow's maximum temperature in Decatur is expected to be 17°C.

  • Monday
    14th Apr
    Broken clouds
  • Tuesday
    15th Apr
    Scattered clouds
  • Wednesday
    16th Apr
    Clear skies
  • Thursday
    17th Apr
    Mostly cloudy with light rain (2-5 mm of rainfall expected)
  • Friday
    18th Apr
    Isolated thunderstorms (10-20 mm of rainfall expected)

5-day weather forecast updated at 04:01 on Monday 14th April 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 14th April 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.

  • 17°C maximum temperature17
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 15 kph from the West15
    kph wind from W

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Decatur weather for Tuesday 15th April 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 14°C, maximum UV of 3 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the north-west.

  • 14°C maximum temperature14
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 14°C wind chill14
    °C wind chill
  • Moderate breeze of 20 kph from the North-West20
    kph wind from NW

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Decatur weather for Wednesday 16th April 2025

Expect clear skies in Decatur, Illinois with a maximum temperature of 17°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 5 kph from the south.

  • 17°C maximum temperature17
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Clear skies
    clear skies
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 17°C wind chill17
    °C wind chill
  • Little or no wind of 5 kph from the South5
    kph wind from S

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Decatur weather for Thursday 17th April 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 56% chance of some rain and a gentle breeze of 19 kph from the south.

  • 19°C maximum temperature19
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 56% chance of some rain56
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 19°C wind chill19
    °C wind chill
  • Gentle breeze of 19 kph from the South19
    kph wind from S

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Decatur weather for Friday 18th April 2025

Expect isolated thunderstorms in Decatur, Illinois with a maximum temperature of 26°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 66% chance of some rain and a gentle breeze of 19 kph from the south-west.

  • 26°C maximum temperature26
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 66% chance of some rain66
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • 26°C wind chill26
    °C wind chill
  • Gentle breeze of 19 kph from the South-West19
    kph wind from SW

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

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