Sunday, October 19, 2025

Chicago weather: First frost later this week? It’s possible in parts of Chicagoland!

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Current Weather in Chicago

After a soggy start to the day, clouds have cleared out, and we’re looking at a quiet stretch of weather through the week and weekend.

Fox 32 Chief Meteorologist Emily Wahls has the forecast.

What to Expect

The weather forecast for the rest of the week is looking promising, with a few interesting developments that could impact the daily lives of Chicagoans.

Tonight will be clear and cool with lows in the 40s for most suburbs, but low 50s in Chicago and close to the lakefront. This temperature difference is due to the proximity to Lake Michigan, which tends to regulate temperatures and keep them relatively mild compared to inland areas.

Wednesday’s Forecast

Wednesday will start off sunny and then a few lake effect clouds may develop during the midday and afternoon hours with winds coming in off of Lake Michigan. This is a common phenomenon in the region, where winds blowing over the lake pick up moisture and develop clouds as they reach the shore.

Wednesday night will be cold with lows plummeting into the upper 30s to mid 40s across Chicagoland, so patchy frost may be possible for our far outlying areas by Thursday morning. This could be the first frost of the season for some areas, marking the beginning of the end of the growing season.

Thursday and Friday

Thursday looks like a beautiful Fall day with sunny skies and highs in the mid 60s. This will be a great day to get outdoors and enjoy the fall foliage, which is expected to be particularly vibrant this year due to the wet summer.

Friday will bring more cloud cover and a very small possibility for a few sprinkles. Most areas will stay dry with partly sunny skies and highs in the mid to upper 60s. While there is a chance of precipitation, it is not expected to be significant and should not impact outdoor plans.

The Weekend

The weekend will be dry with a gradual warm up. Saturday’s temperatures will be in the upper 60s to low 70s and then we warm into the lower 70s on Sunday for the Chicago Marathon. This will be ideal weather for the thousands of runners participating in the marathon, as well as spectators cheering them on.

Conclusion

In conclusion, the weather forecast for the rest of the week is looking quiet and pleasant, with a few cooler nights and a chance of frost in outlying areas. As we head into the weekend, temperatures will warm up and conditions will be ideal for outdoor activities. Whether you’re planning on running in the Chicago Marathon or just enjoying the fall foliage, the weather is expected to cooperate.

Frequently Asked Questions

Here are some frequently asked questions about the weather forecast:

Q: Will it frost this week?

A: Yes, there is a possibility of patchy frost in outlying areas by Thursday morning, especially in areas away from Lake Michigan.

Q: What will the weather be like for the Chicago Marathon?

A: The weather forecast for the Chicago Marathon is looking ideal, with temperatures in the lower 70s and dry conditions expected.

Q: Will it rain this week?

A: There is a small chance of sprinkles on Friday, but most areas will stay dry and precipitation is not expected to be significant.

Q: How cold will it get at night?

A: Lows will be in the 40s for most suburbs and low 50s in Chicago and close to the lakefront, with colder temperatures expected on Wednesday night.

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