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

Todays weather in St. Louis MO - Monday - 18 May 2026

St. Louis hits near 90°F Sunday before a multi-day severe weather outbreak unleashes damaging winds, large hail, and tornado threats Monday and Tuesday. Use this gorgeous afternoon to prep — storms could arrive after midnight tonight.

Todays weather in St. Louis MO
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Todays weather in St. Louis MO - Monday - 18 May 2026

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What's covered

Sunday Heat Before the Storm

St. Louis, enjoy today.

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Severe Weather Alert Monday Tuesday

A Weather Impact Alert is now in effect for Monday into Tuesday. Strong to severe thunderstorms are on the way, and the hazard list is serious.

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Monday Commute and Storm Rounds

Monday and Tuesday both carry the threat of multiple storm rounds. That warm Gulf moisture isn't going anywhere quickly, which means the atmosphere keeps reloading.

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Tornado Risk and Situational Awareness

The tornado risk is isolated, not widespread. The probability is relatively low.

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Sunday Prep Window

This afternoon is your prep window. Charge devices.

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Closing Outlook

St. Louis.

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