St. Louis, Missouri – Dangerous heat will grip eastern Missouri and southwestern Illinois through Tuesday, pushing heat index values over 105° across the St. Louis metro. The National Weather Service has issued an Extreme Heat Warning through 9 p.m. Tuesday, prompting urgent safety measures for residents and travelers.
According to the National Weather Service in St. Louis, temperatures on Tuesday, June 24, will climb to 93–96°F, with humidity pushing heat index values between 103–110°F in areas including St. Louis City, Jefferson County, and St. Charles. Motorists along I-64 and I-55 should prepare for slowdowns, heat-related vehicle issues, and the risk of heat illness during afternoon travel.
Cooling centers are open across the metro. Residents can call 2-1-1 or the United Way at 800-427-4626 for local assistance. Avoid outdoor work during peak hours, hydrate regularly, and check on vulnerable neighbors. Prolonged exposure could lead to heat exhaustion or worse.
Isolated thunderstorms may bring brief relief after 4 p.m. Tuesday and again Wednesday afternoon, though rain chances remain at 20%. The rest of the week stays hot, with highs in the mid-90s through the weekend.
🔎 Five-Day Forecast for St. Louis (June 24–28):
- Tuesday [June 24]: High 93°F, heat index near 105°, 20% chance of storms after 4 p.m.
- Wednesday [June 25]: High 94°F, isolated afternoon storms (20% chance), humid.
- Thursday [June 26]: Sunny, high 96°F, no rain expected.
- Friday [June 27]: Slight storm chance after 1 p.m., high 96°F.
- Saturday [June 28]: Partly cloudy, high near 94°F, low rain chance (20%).
