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 Monday 1st 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 Monday 1st December 2025

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 2-5 cm of snow expected with 84% chance of some snow and little or no wind of 1 kph from the south-east.

  • -2°C maximum temperature-2
    °C maximum temperature
  • -6°C minimum temperature-6
    °C 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)
  • 84% chance of some snow84
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • No heat & humidity0
    no heat & humidity
  • Little or no wind of 1 kph from the South-East1
    kph wind from SE

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Decatur weather for Tuesday 2nd 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 little or no wind of 2 kph from the north-west.

  • -4°C maximum temperature-4
    °C maximum temperature
  • -7°C minimum temperature-7
    °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
  • No heat & humidity0
    no heat & humidity
  • Little or no wind of 2 kph from the North-West2
    kph wind from NW

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Decatur weather for Wednesday 3rd December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of 0°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 5 kph from the south.

  • 0°C maximum temperature0
    °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
  • -1°C wind chill-1
    °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 4th December 2025

Expect scattered clouds in Decatur, Illinois with a maximum temperature of -6°C, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 5 kph from the north-west.

  • -6°C maximum temperature-6
    °C maximum temperature
  • -14°C minimum temperature-14
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 0 cm of snow expected0
    cm of snow expected
  • -8°C wind chill-8
    °C wind chill
  • Little or no wind of 5 kph from the North-West5
    kph wind from NW

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Decatur weather for Friday 5th December 2025

Expect broken clouds in Decatur, Illinois with a maximum temperature of -2°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and little or no wind of 2 kph from the south.

  • -2°C maximum temperature-2
    °C maximum temperature
  • -13°C minimum temperature-13
    °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
  • -2°C wind chill-2
    °C wind chill
  • Little or no wind of 2 kph from the South2
    kph wind from S

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  • Book online with TUI Black Friday discount code
  • Sign up to myTUI. Discount varies by spend. T&Cs apply
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Metric (°C / mm)  |  Imperial (°F / inches)

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