St. Louis/ Weather & Environment

Cool Breeze Before the Sizzle: Sunny St. Louis Weekend Before Heat Roars Back

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Published on August 22, 2026
Cool Breeze Before the Sizzle: Sunny St. Louis Weekend Before Heat Roars BackSource: Google Street View

St. Louis is getting a welcome weather reset Saturday, with clear skies, temperatures around 72 degrees early and an afternoon high near 87. A northwest breeze and almost no rain chance should make for an easy day outdoors, even if summer is not quite ready to leave the chat.

The National Weather Service in St. Louis expects mostly clear skies Saturday night, with temperatures falling to about 66 degrees. Sunday will stay sunny and noticeably cooler, topping out near 84 degrees with relatively low humidity.

Cooler Sunday Gives Way To Warmer Air

Monday will remain mostly sunny with a high near 82, but warmer and more humid air will begin moving back into the region. The next several days will trend warmer, with highs around 85 Tuesday and 88 Wednesday.

Small Storm Chances Arrive Overnight

The forecast includes a slight chance of showers or thunderstorms late Monday night and early Tuesday, with a 20% chance of precipitation. Another slight chance could arrive early Wednesday, but both days are expected to turn mostly sunny after those limited storm opportunities.

Sunny Late Week Forecast

Thursday and Friday look sunny with highs near 89 degrees, while overnight lows settle around 69 to 70. No watches, warnings or advisories are in effect for Missouri or Illinois in the current forecast.