Illinois weather live forecast

Today's maximum temperature in Illinois is expected to be 73°F. Select a day from the live weather forecast for Illinois (Chicago), USA for more weather parameters.

5-day weather forecast updated at 04:01 on Sunday 31st August 2025 GMT

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The 5-day weather forecast for Illinois (Chicago) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

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Below are temperatures expected today at popular countries, regions and places in Illinois. Select a destination to see the detailed weather forecast for today, tomorrow and the outlook for the next five days.

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Illinois weather forecast by day

Below are the detailed weather forecasts for Illinois for the next 5 days. The forecasts shown are for Chicago and may not represent the whole of Illinois. Browse more destinations in Illinois to view more weather forecasts.

Illinois weather for Sunday 31st August 2025

Expect clear skies in Illinois with a maximum temperature of 73°F, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 4 mph from the east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 63°F minimum temperature63
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 4 mph from the East4
    mph wind from E

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Illinois weather for Monday 1st September 2025

Expect clear skies in Illinois with a maximum temperature of 73°F, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the north-east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 64°F minimum temperature64
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 5 mph from the North-East5
    mph wind from NE

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Illinois weather for Tuesday 2nd September 2025

Expect scattered clouds in Illinois with a maximum temperature of 77°F, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 2 mph from the east.

  • 77°F maximum temperature77
    °F maximum temperature
  • 64°F minimum temperature64
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Little or no wind of 2 mph from the East2
    mph wind from E

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Illinois weather for Wednesday 3rd September 2025

Expect isolated thunderstorms in Illinois with a maximum temperature of 75°F, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 73% chance of some rain and a gentle breeze of 8 mph from the south-west.

  • 75°F maximum temperature75
    °F maximum temperature
  • 61°F minimum temperature61
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 73% chance of some rain73
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 8 mph from the South-West8
    mph wind from SW

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Illinois weather for Thursday 4th September 2025

Expect broken clouds in Illinois with a maximum temperature of 61°F, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the north-west.

  • 61°F maximum temperature61
    °F maximum temperature
  • 54°F minimum temperature54
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 61°F wind chill61
    °F wind chill
  • Light breeze of 7 mph from the North-West7
    mph wind from NW

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