Todays weather in St. Louis MO - Monday - 08 June 2026

A Flood Watch is active across St. Louis right now, running through 1 a.m. Tuesday — and that's the headline for today's forecast. Showers and thunderstorms are already developing this morning, with storm chances climbing through mid-morning and early afternoon. The high reaches near 85 degrees, humidity is elevated, and south winds at around 10 mph won't provide any relief. Precipitation probability sits at 69% today — pack an umbrella, it is not optional.For commuters, expect wet roads, reduced visibility, and unpredictable traffic conditions. Avoid low-lying areas, watch for fast-rising water, and never drive through flooded roads. Tonight brings a 42% chance of showers and thunderstorms, with a low near 72 — the storms ease but don't fully clear overnight.The week ahead has a dramatic swing. Tuesday clears out quickly, turns mostly sunny, and surges to a high near 93 degrees. Heat index values could reach 109 degrees — a dangerous combination that may catch people off guard after a stormy Monday. Wednesday goes full sun near 95 degrees before another round of storm chances rolls back in Thursday night, again with a 69% precipitation chance.The pattern in a nutshell: storms and flooding risk today, a dangerous mid-week heat event, then the storm cycle resumes by Thursday. Keep that umbrella handy today and have your water bottle ready for Tuesday. Stay safe, St. Louis.This episode includes AI-generated content.