Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 28°F. Select a day from the live weather forecast for Decatur, Illinois, USA for more weather parameters.

5-day weather forecast updated at 04:01 on Friday 5th December 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 Friday 5th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 28°F, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 13 mph from the south.

  • 28°F maximum temperature28
    °F maximum temperature
  • 7°F minimum temperature7
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • 18°F wind chill18
    °F wind chill
  • Moderate breeze of 13 mph from the South13
    mph wind from S

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Decatur weather for Saturday 6th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 30°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 11 mph from the west.

  • 30°F maximum temperature30
    °F maximum temperature
  • 27°F minimum temperature27
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • 21°F wind chill21
    °F wind chill
  • Gentle breeze of 11 mph from the West11
    mph wind from W

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Decatur weather for Sunday 7th December 2025

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of 32°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 2-5 cm of snow expected with 52% chance of some snow and a moderate breeze of 14 mph from the north.

  • 32°F maximum temperature32
    °F maximum temperature
  • 18°F minimum temperature18
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 52% chance of some snow52
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • 21°F wind chill21
    °F wind chill
  • Moderate breeze of 14 mph from the North14
    mph wind from N

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Decatur weather for Monday 8th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 23°F, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 14 mph from the south.

  • 23°F maximum temperature23
    °F maximum temperature
  • 14°F minimum temperature14
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • 12°F wind chill12
    °F wind chill
  • Moderate breeze of 14 mph from the South14
    mph wind from S

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Decatur weather for Tuesday 9th December 2025

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of 37°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 2-5 cm of snow expected with 31% chance of some snow and a fresh breeze of 19 mph from the south-west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 25°F minimum temperature25
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 31% chance of some snow31
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • 27°F wind chill27
    °F wind chill
  • Fresh breeze of 19 mph from the South-West19
    mph wind from SW

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