St. Louis Weather: Crisp 70s Days, Chilly 40s Nights Feel More Like October Than August

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St. Louis, Missouri –

A dramatic drop in temperatures is ushering in a fall-like finish to August across Missouri, with highs in the mid-70s and overnight lows dipping into the upper 40s—conditions more fitting for early October than late summer.

According to the National Weather Service in St. Louis, cooler and less humid air has moved in as of Saturday, and will linger through at least early next week. Most of the state will stay in the 70s during the day, with some rural areas potentially seeing lows in the upper 40s to low 50s.

In cities like Columbia, Jefferson City, and Springfield, residents may want to keep a light jacket handy, especially for early morning commutes or late evening outings. The lower humidity will be welcome relief after a stretch of hot, sticky days earlier this month.

While there are no active weather hazards, the cooler temps may impact outdoor plans, particularly for overnight camping or early-morning sports events. No heat advisories are expected to return before the end of August.

This unusual cooldown is expected to hold steady through Tuesday, with a gradual warm-up likely by midweek. Updates from NWS St. Louis will continue as conditions evolve.