St. Louis is starting Thursday under clear skies near 65 degrees, with calm conditions giving the city a quiet reset before a sunny afternoon reaches 86. The cooldown is short-lived, though: temperatures head back toward 90 Saturday and then into the mid- to upper 90s next week.
According to the National Weather Service in St. Louis, a north wind between 2 and 8 mph will keep Thursday dry, with no rain expected and humidity easing as the day warms. Friday stays sunny and dry, topping out near 87 with lighter northeast winds.
Saturday Brings Back Summer
Saturday will be mostly sunny and warmer, with a high near 90 and a light southeast breeze. Saturday night turns partly cloudy with a low around 70, but the rain chance remains close to zero.
Sunday Begins the Bigger Heat Push
Sunday’s high is expected to reach 95, followed by 97-degree afternoons Monday, Tuesday and Wednesday. Overnight lows will stay in the mid-70s, leaving less relief after sunset as the heat builds.
The sharper turn is a meaningful update from Hoodline’s Wednesday forecast, which was still focused on lingering heat before this two-day cooldown. The latest weather discussion says heat-index values could approach or slightly exceed 100 degrees in some locations by midweek, so outdoor plans will be easier Thursday and Friday than they will be next week.
Clear Skies Now, Heat Safety Later
No watches, warnings or advisories are listed for the St. Louis forecast area. Still, residents should plan for water, shade and regular breaks during the hottest afternoon hours once the 90s settle back in, especially for older adults, children and anyone working outdoors.
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