St. Louis/ Weather & Environment

Fog Fizzles, Sun Sizzles: St. Louis Basks in 77-Degree Warm-Up

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Published on October 23, 2026
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St. Louis is heading into Friday with clear skies, calm winds and overnight lows expected in the upper 40s to low 50s, but the morning chill will not last. Patchy fog may briefly settle in before the sun takes over and pushes the high to about 77 degrees.

Fog Clears Before the Warm-Up

The chance of valley fog in the morning is uncertain, with the greatest likelihood at SUS or CPS and possibly JEF; winds will be light, and dry weather is expected for the day, according to the National Weather Service.

For Friday night, temperatures are expected to be near 50 degrees. The regional events calendar lists the Saint Louis Chess Conference and the Saint Louis Dance Theatre fall series around the area, according to Explore St. Louis.

Warm Weekend, Quiet Nights

Saturday will be warm and dry with a high near 76, followed by another warm, dry day Sunday with a high around 78. Overnight lows will be close to 50 degrees Saturday night before edging up to about 53 Sunday night, as high pressure keeps the region dry and seasonably warm.

The associated cold front is expected to stay well north of the forecast region Tuesday into Wednesday, with a ridge remaining over the region and warm conditions continuing.

For now, the local forecast favors dry weather over rain: dress in layers for the cool start, then plan for warm afternoons through the weekend.