Chicago Weather: Rain, Cooler Temperatures Arrive in October 2025

High temperatures in the low-to-mid 80s will give way to cooler temperatures in the mid-to-upper 60s by Tuesday.

Rain and thunderstorms are expected, with up to one-half inch of rain possible in some locations.

Overnight lows will drop into the upper 40s in the city and potentially even lower in outlying areas.

A beautiful weekend is expected with highs rising back into the low-to-mid 70s under clear skies.

Monday:: Highs in the low-to-mid 80s with increasing clouds and a chance of isolated showers.

Monday Evening:: Isolated showers and storms are expected to spread across the area, bringing moderate-to-heavy rain at times.

Tuesday:: Widespread showers and thunderstorms are expected to continue overnight, with cooler temperatures expected before daybreak. Highs in the mid-to-upper 60s.

Wednesday and Thursday:: Plenty of sunshine with highs in the mid-to-upper 60s. Overnight lows will be significantly cooler, dropping into the upper-40s in the city and potentially even lower in outlying areas.

Friday:: A weak disturbance will sweep across the area, with isolated showers possible. Highs will be slightly warmer, rising into the upper-60s or even the low-70s.

Saturday and Sunday:: A beautiful weekend is expected, with highs rising back into the low-to-mid 70s under clear skies.

Q: How much rain is expected?

Q: When will the cooler temperatures arrive?

Stay updated on the latest weather forecasts.

Dress in layers to adjust to changing temperatures.

Be prepared for potential travel delays due to rain.