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St. Louis, Missouri – St. Louis faces a dangerous spike in heat index values by Sunday, July 20, with conditions nearing 109°F and storm chances returning. The National Weather Service has issued an Extreme Heat Warning in effect until 7 p.m. Wednesday, July 24. Residents are urged to stay indoors, limit outdoor activity, and avoid travel along sun-exposed roadways like I-64 and I-70 during peak afternoon hours.
According to the National Weather Service, Sunday will reach a high of 98°F with a heat index potentially topping 109°F. A 30% chance of thunderstorms enters the picture late Sunday night, and a few could linger into Monday afternoon. Humidity will stay high, keeping conditions muggy even overnight. Winds will shift from the west at 3 to 6 mph.
Heat-related illnesses remain a major concern, especially for vulnerable populations. Power grid strain is likely, so residents should charge devices, use fans conservatively, and stay hydrated. Emergency cooling centers may open if demand surges.
Monday brings a high of 93°F with a slight 20% chance of storms before temperatures rebound sharply Tuesday through Thursday, peaking near 99°F by July 24.
🔭 5-Day Forecast for St. Louis, MO | July 20–25
- Sunday (July 20): High 98°F, Heat Index 109°F, Partly Cloudy
- Monday: High 93°F, 20% chance of storms, Partly Sunny
- Tuesday: Mostly Sunny, High 96°F
- Wednesday: Sunny, High 99°F
- Thursday: Mostly Sunny, High 99°F
- Friday: High near 98°F, Sunny
