St. Louis, Missouri – Drivers around St. Louis and eastern Missouri should plan for patchy fog early Tuesday, followed by a sharp warm-up that could send temperatures near 90 degrees by midweek. According to the National Weather Service, areas of dense fog may develop before 8 a.m. Tuesday, especially near rivers and low-lying spots, potentially reducing visibility during the morning commute.
Skies will gradually clear Tuesday, setting up a stretch of sunny, hot weather with highs in the upper 80s to lower 90s from Wednesday through Saturday. Humidity will increase, making conditions feel even warmer, especially during the afternoon. Overnight lows will remain mild, mostly in the lower 70s.
While the midweek is quiet, spotty thunderstorms could return by Sunday afternoon across the St. Louis metro and surrounding counties. Forecasters note a 20 to 30 percent chance of showers and storms both Sunday and Monday, possibly bringing brief downpours and gusty winds.
If you’re traveling or have outdoor plans, allow extra time Tuesday morning for fog, and take precautions in the heat later this week—drink water and avoid strenuous activity during peak hours. Keep an eye on local alerts as more thunderstorm advisories may be issued for the end of the weekend.
Five Day Forecast for St. Louis, Missouri:
- Tuesday: Patchy morning fog, then mostly sunny, high 86°F, low 69°F
- Wednesday: Sunny and hot, high 90°F, low 71°F
- Thursday: Sunny, high 91°F, low 72°F
- Friday: Sunny, high 92°F, low 74°F
- Saturday: Mostly sunny, high 93°F, low 74°F
- Sunday: 20% chance of showers and thunderstorms, high 91°F, low 74°F
