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Chicago +78°

Feels like
+77°

wind

Wind

10 mph

humidity

Humidity

43 %

uv-index

UV index

8 of 11

01:00 PM

+79°

09:00 PM

+73°

04:00 AM

+68°

Severe Weather

Air Quality Alert

Issued by NWS Chicago IL

Start: 2025 August 03, 12:05 AM
End: 2025 August 04, 12:00 AM

The Illinois Environmental Protection Agency has determined that an "Air Pollution Action Day" will remain in effect for the greater Chicago Metropolitan Area through midnight tonight. A Chicago area "Air Pollution Action Day" is declared when weather conditions are such that widespread ozone and or particulate levels are expected to be at or above the Unhealthy for Sensitive Groups category of the Air Quality Index for multiple days. Active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. Area residents are urged to reduce pollution levels. Air quality forecasts, current air quality, and tips on how you can reduce your emissions can be found at www.airnow.gov. Media contact...Illinois EPA.

Your Daily Weather Update

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Weather conditions

Wind

10 mph

Rain

N/A

Temperature

+78°

Feels Like

+77°

Humidity

43 %

Pressure

1021 hPa

Cloudiness

95 %

UV Index

8

Sunrise

5:47 AM

Sunset

8:05 PM

Moonrise

5:08 PM

Moonset

12:46 AM

Precipitation Probability

0 %

Dew Point

+53°

Wind Gust

16 mph

Hourly Forecast

Air Quality Forecast

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Frequently Asked Questions

Learn more about Weatheradar’s weather parameters, their units of measurement, and what values to pay attention to.

Atmospheric Parameters

Pressure refers to the atmospheric pressure at sea level, measured in hectopascals (hPa). Values higher than 1020 hPa often indicate clear skies, while values below 1000 hPa may signal storms or unsettled weather.

Humidity represents the percentage of water vapor in the air. Higher values (above 70%) indicate sticky or humid conditions, often preceding rain or fog.

Temperature Parameters

"Feels Like" accounts for wind chill or humidity, making it feel colder or warmer than the actual temperature. For example, wind can make a day feel colder, while high humidity makes it feel hotter.

The dew point is the temperature at which the air becomes saturated and water vapor condenses. Higher dew points (>20°) indicate humid conditions, while lower dew points (<10°) mean drier weather.

UV and Precipitation

The UV Index measures ultraviolet radiation from the sun. Values 0–2 are safe, while values 6+ require sun protection (sunscreen, shade).

Precipitation Probability is the chance of rain or snow. Values above 50% indicate a moderate likelihood, while values above 80% suggest you should carry an umbrella.

Chicago weather forecast for tomorrow

It’s never a bad idea to double-check the weather forecast for tomorrow in Chicago, we guarantee you that! Would the marathon be canceled due to a sudden downpour? Will you be snowed in and need to prepare a few extra blankets? Or would it be perfectly comfortable to go and enjoy a swim in the lake or a vibrant fall foliage?

You can always check the temperature, precipitation and other convenient features provided by our website to decide exactly what you should do tomorrow, no matter what season it is.

What weather should I expect tomorrow in Chicago?

A nice vacation day with your family, a busy day at work with endless meetings, a night out with your friends, a first date, or a graduation party, each of those require good planning to be flawless. And what better way to start your preparation than to check weather forecast for tomorrow, to make sure everything – from your outfit choice to the venue – is just perfect for the occasion.

You hate to have your hairstyle ruined by humidity? Good old Lake Michigan does make sure that can happen any day of the week. But our team is always ready to extend a helping hand with the ‘humidity’ feature to keep you informed and ready to face the new day head-on.

/ Weather Tomorrow