Todays weather in St. Louis MO - Tuesday - 09 June 2026

St. Louis is waking up to a Heat Advisory in effect all day, with current temperatures at 92°F and a heat index pushing toward 108°F when humidity is factored in. Add a 50% chance of afternoon showers and thunderstorms, and today demands some real planning before you step outside.Here's the practical breakdown for your day: dress light, carry an umbrella, and keep outdoor plans flexible. Storms can develop quickly in this kind of humidity, and light southwest winds at 3–7 mph offer zero relief from the heat. Stay hydrated — heat index values this high can catch people off guard fast. The Heat Advisory runs until 10 PM, meaning the entire day is in play.The overnight outlook is more forgiving. Skies clear out, the low drops to around 75°F, and the storm chance falls to just 9%. The advisory lifts at 10 PM, giving you a proper window to recover.Looking further ahead: Wednesday and Thursday both reach near 95°F, with heat index values staying above 100 through mid-week. Thursday night brings a major storm threat at 81%, so that's the next big weather event to track. Friday offers some relief, with a high near 86°F and lower humidity beginning to move in.This is your daily St. Louis weather briefing — under three minutes, practical, and built for your commute. A YesWee production.This episode includes AI-generated content.