Todays weather in St. Louis MO · 16 May 2026 · 2 min

Todays weather in St. Louis MO - Saturday - 16 May 2026

St. Louis enjoys a rare comfortable May day with partly cloudy skies, mild temps, and zero severe weather alerts — but tropical humidity is closing in fast. Here's what to expect today and why this weekend's forecast deserves your attention.

Todays weather in St. Louis MO
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Todays weather in St. Louis MO - Saturday - 16 May 2026

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What's covered

St. Louis Calm Before Humidity

St. Louis.

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Today's Forecast Conditions

Temperatures are holding in a pleasant range, and tonight's lows drop into the middle sixties. That is genuinely comfortable sleeping weather, especially with the windows cracked.

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No Alerts Worth Tracking

Here's the thing about days like this in St. Louis: they're worth paying attention to precisely because they don't last.

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Humidity Surge Moving In

That changes this weekend. Tropical air is going to start pushing into the region, and humidity levels are going to climb.

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What to Watch Next

Models may also adjust the severe weather picture for later in the week as that moisture increases. Nothing confirmed yet, but late spring in St.

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