Illinois weather live forecast

Tomorrow's maximum temperature in Illinois is expected to be 79°F.

5-day weather forecast updated at 04:00 on Wednesday 18th June 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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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 Wednesday 18th June 2025

Expect isolated thunderstorms in Illinois with a maximum temperature of 79°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 20-30 mm of rainfall expected with 99% chance of some rain and a gentle breeze of 11 mph from the north-west.

  • 79°F maximum temperature79
    °F maximum temperature
  • 66°F minimum temperature66
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 99% chance of some rain99
    % chance of some rain
  • 20-30 mm of rainfall expected<30
    mm of rainfall expected
  • 79°F wind chill79
    °F wind chill
  • Gentle breeze of 11 mph from the North-West11
    mph wind from NW

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Illinois weather for Thursday 19th June 2025

Expect sunshine and showers in Illinois with a maximum temperature of 79°F, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 28% chance of some rain and a gentle breeze of 9 mph from the north-west.

  • 79°F maximum temperature79
    °F maximum temperature
  • 64°F minimum temperature64
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 28% chance of some rain28
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 79°F wind chill79
    °F wind chill
  • Gentle breeze of 9 mph from the North-West9
    mph wind from NW

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Illinois weather for Friday 20th June 2025

Expect scattered clouds in Illinois with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 12 mph from the south.

  • 84°F maximum temperature84
    °F maximum temperature
  • 68°F minimum temperature68
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 12 mph from the South12
    mph wind from S

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Illinois weather for Saturday 21st June 2025

Expect scattered clouds in Illinois with a maximum temperature of 91°F, high levels of heat & humidity, maximum UV of 9 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 16 mph from the south-west.

  • 91°F maximum temperature91
    °F maximum temperature
  • 73°F minimum temperature73
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Moderate breeze of 16 mph from the South-West16
    mph wind from SW

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Illinois weather for Sunday 22nd June 2025

Expect clear skies in Illinois with a maximum temperature of 91°F, high levels of heat & humidity, maximum UV of 9 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the south-west.

  • 91°F maximum temperature91
    °F maximum temperature
  • 77°F minimum temperature77
    °F minimum temperature
  • Clear skies
    clear skies
  • 15 hours of bright sunshine15
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Moderate breeze of 14 mph from the South-West14
    mph wind from SW

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