Decatur weather live forecast

Today's maximum temperature in Decatur is expected to be 3°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 Wednesday 21st January 2026 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 Wednesday 21st January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of 3°C, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • -2°C wind chill-2
    °C wind chill
  • Moderate breeze of 26 kph from the West26
    kph wind from W

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Decatur weather for Thursday 22nd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -1°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 24 kph from the west.

  • -1°C maximum temperature-1
    °C maximum temperature
  • -6°C minimum temperature-6
    °C minimum temperature
  • Broken clouds
    broken clouds
  • No hours of bright sunshine0
    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
  • Moderate breeze of 24 kph from the West24
    kph wind from W

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Decatur weather for Friday 23rd January 2026

Expect broken clouds in Decatur, Illinois with a maximum temperature of -7°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 26 kph from the north.

  • -7°C maximum temperature-7
    °C maximum temperature
  • -18°C minimum temperature-18
    °C 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
  • -15°C wind chill-15
    °C wind chill
  • Moderate breeze of 26 kph from the North26
    kph wind from N

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Decatur weather for Saturday 24th January 2026

Expect mostly cloudy with snow in Decatur, Illinois with a maximum temperature of -12°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 5-10 cm of snow expected with 32% chance of some snow and a gentle breeze of 17 kph from the north-east.

  • -12°C maximum temperature-12
    °C maximum temperature
  • -19°C minimum temperature-19
    °C minimum temperature
  • Mostly cloudy with snow
    mostly cloudy with snow
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 32% chance of some snow32
    % chance of some snow
  • 5-10 cm of snow expected<10
    cm of snow expected
  • -19°C wind chill-19
    °C wind chill
  • Gentle breeze of 17 kph from the North-East17
    kph wind from NE

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Decatur weather for Sunday 25th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -8°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 24% chance of some snow and a gentle breeze of 17 kph from the north-west.

  • -8°C maximum temperature-8
    °C maximum temperature
  • -14°C minimum temperature-14
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 24% chance of some snow24
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -15°C wind chill-15
    °C wind chill
  • Gentle breeze of 17 kph from the North-West17
    kph wind from NW

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

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