Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be -2°C. 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 Saturday 6th 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 scattered clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 19 kph from the south.

  • -2°C maximum temperature-2
    °C maximum temperature
  • -17°C minimum temperature-17
    °C minimum temperature
  • Scattered clouds
    scattered 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
  • -7°C wind chill-7
    °C wind chill
  • Gentle breeze of 19 kph from the South19
    kph 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 0°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 18 kph from the west.

  • 0°C maximum temperature0
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -5°C wind chill-5
    °C wind chill
  • Gentle breeze of 18 kph from the West18
    kph wind from W

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Decatur weather for Sunday 7th December 2025

Expect overcast skies in Decatur, Illinois with a maximum temperature of 0°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 24 kph from the north.

  • 0°C maximum temperature0
    °C maximum temperature
  • -8°C minimum temperature-8
    °C minimum temperature
  • Overcast skies
    overcast skies
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Moderate breeze of 24 kph from the North24
    kph 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 -4°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 23 kph from the south.

  • -4°C maximum temperature-4
    °C maximum temperature
  • -10°C minimum temperature-10
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -11°C wind chill-11
    °C wind chill
  • Moderate breeze of 23 kph from the South23
    kph wind from S

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Decatur weather for Tuesday 9th December 2025

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 4°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a fresh breeze of 32 kph from the south-west.

  • 4°C maximum temperature4
    °C maximum temperature
  • -5°C minimum temperature-5
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 37% chance of some rain37
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • -2°C wind chill-2
    °C wind chill
  • Fresh breeze of 32 kph from the South-West32
    kph wind from SW

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

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