Todays weather in Chicago · 12 May 2026 · 4 min

Polar Air in May: Wind, Rain & Chicago's Coldest Week Forecast

Polar air has pushed into Chicago this week, dropping temperatures 10–15 degrees below normal for early May. Get the full breakdown of rain timing, wind chill, lake effect conditions, and what to wear every day this week.

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Polar Air in May: Wind, Rain & Chicago's Coldest Week Forecast

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What's covered

Early May Chill Returns Chicago

Winter didn't get the memo that it's May. Polar air has pushed back into the Chicago metro, and temperatures this week are running ten to fifteen degrees below where they should be for early May.

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Rain Arrives Tuesday Commute

Tuesday is where the week shifts. Rain arrives, and it arrives with wind behind it.

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Wednesday Worst Conditions Forecast

On Wednesday's rain intensity, there's some honest uncertainty worth flagging. The probability is high, but how much rain actually falls and how hard it comes down isn't fully specified yet.

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Wind Chill Lake Effect Risk

The wind story runs through the entire week, and it's worth treating seriously. Twenty miles per hour sustained is not a light breeze.

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Saturday Rain Weekend Plans

Saturday brings a third rainy day. The timing is uncertain, which matters if you're deciding between a morning event and an afternoon one.

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Weekly Forecast Takeaway Chicago

The one metric worth watching closely is Wednesday's rainfall total as the forecasts update. That's the day with the most conditions stacked against you, and knowing how intense it gets helps calibrate the rest of the week's outlook.

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