St. Louis, MO – Dangerous heat and a chance of storms will greet the St. Louis area Monday afternoon, with heat index values pushing near 100° and scattered thunderstorms possible. The combination of heat and humidity could make outdoor work and activities risky during peak afternoon hours.
According to the National Weather Service, Monday will start mostly sunny with highs near 93°, but moisture in the atmosphere will help fuel a 20% chance of showers and thunderstorms after 1 p.m. Gusty winds, brief downpours, and lightning are possible in any storm. South winds will stay light, offering little relief from the heat.
The risk will linger into Monday night with a slight chance of storms continuing after sunset. While storm coverage will be limited, any cell could produce sudden hazards for evening commuters and outdoor events. Residents should stay hydrated, avoid prolonged exposure during the hottest part of the day, and monitor for changing weather conditions.
The threat of pop-up storms will continue through midweek, with temperatures staying in the lower 90s and humidity keeping heat index values elevated.
Five Day St. Louis, MO Forecast:
- Sunday: Mostly sunny, slight chance of showers/storms after 1 p.m. High 94°F, low 74°F
- Monday: Mostly sunny, slight chance of storms after 1 p.m. High 93°F, low 75°F
- Tuesday: Partly sunny, slight chance of storms after 1 p.m. High 92°F, low 74°F
- Wednesday: Partly sunny, scattered storms possible. High 91°F, low 73°F
- Thursday: Partly sunny, scattered storms after 1 p.m. High 91°F, low 73°F
