St. Louis/ Weather & Environment

Gateway City Chills Out: Cool, Dry Week Finally Breaks St. Louis Heat

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Published on September 21, 2026
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St. Louis is waking to widespread low-level cloud cover and north-to-northeast winds of up to 12 knots Monday morning, with temperatures around 70 degrees, but the weather is already shifting toward a cooler pattern. A few showers and thunderstorms may linger through the morning. The day should remain in the 60s and 70s under widespread low-level cloud cover.

Scattered showers and thunderstorms are expected to wind down later Monday morning, although a stray shower or storm remains possible into midafternoon. The National Weather Service says north-to-northeast winds will stay at 12 knots or less, and no watches, warnings or advisories are in effect.

Cooler Air Settles In

Monday night will be mostly cloudy with a low near 63 degrees. Tuesday will be cooler, with a high around 74.

The rest of the workweek brings a welcome stretch of mild, mostly dry weather. Wednesday should bring generally cool, relatively dry conditions, followed by gradual warming through the 70s Thursday and Friday.

A Brief Shower Chance Returns Saturday

Saturday could bring limited rainfall. Temperatures then warm into the low 80s by next weekend.