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 Thursday 15th 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 Thursday 15th January 2026

Expect clear skies with flurries of snow in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0-2 cm of snow expected with 51% chance of some snow and a moderate breeze of 22 kph from the north-west.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -8°C minimum temperature-8
    °C minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 51% chance of some snow51
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -9°C wind chill-9
    °C wind chill
  • Moderate breeze of 22 kph from the North-West22
    kph wind from NW

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Decatur weather for Friday 16th January 2026

Expect mostly cloudy with light rain in Decatur, Illinois with a maximum temperature of 4°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a moderate breeze of 27 kph from the west.

  • 4°C maximum temperature4
    °C maximum temperature
  • -2°C minimum temperature-2
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 41% chance of some rain41
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • -2°C wind chill-2
    °C wind chill
  • Moderate breeze of 27 kph from the West27
    kph wind from W

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Decatur weather for Saturday 17th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -3°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a moderate breeze of 28 kph from the west.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -10°C minimum temperature-10
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 25% chance of some snow25
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -10°C wind chill-10
    °C wind chill
  • Moderate breeze of 28 kph from the West28
    kph wind from W

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Decatur weather for Sunday 18th January 2026

Expect mostly cloudy with light snow in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 3% chance of some snow and a moderate breeze of 25 kph from the south-west.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -13°C minimum temperature-13
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 3% chance of some snow3
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • -12°C wind chill-12
    °C wind chill
  • Moderate breeze of 25 kph from the South-West25
    kph wind from SW

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Decatur weather for Monday 19th January 2026

Expect scattered clouds in Decatur, Illinois with a maximum temperature of -5°C, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 32 kph from the north-west.

  • -5°C maximum temperature-5
    °C maximum temperature
  • -12°C minimum temperature-12
    °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 cm of snow expected0
    cm of snow expected
  • -13°C wind chill-13
    °C wind chill
  • Fresh breeze of 32 kph from the North-West32
    kph wind from NW

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

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