Todays weather in St. Louis MO · 18 Jun 2026 · 2 min

Todays weather in St. Louis MO - Thursday - 18 June 2026

St. Louis is starting mild at 79°F this morning, but a 23% chance of afternoon thunderstorms means you'll want that umbrella handy before you head out. Plus: a stunning Juneteenth forecast and an 84% storm threat arriving Sunday.

Todays weather in St. Louis MO
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Todays weather in St. Louis MO - Thursday - 18 June 2026

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There's an Extreme Heat Warning in effect right now, and it runs through July third. That's not a caution.

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