St. Louis is waking up to a cool, crystal-clear Thursday that will warm into the upper 60s this afternoon under plenty of sunshine, a solid day for patios, errands and pretending the workweek is already over. Skies stay mostly clear overnight with lows near 50°F, so a light jacket will still come in handy early Friday. That is when attention turns to a passing front that will ramp up the odds of showers and thunderstorms across the region.
Sunny, Mild Thursday
Expect a high near 69°F today with southwest winds around 1–10 mph and temperatures climbing from the mid 40s this morning into the 60s by midday. The afternoon is expected to stay dry and comfortable, making outdoor plans an easy call. Tonight will be mostly clear with a low around 50°F.
Showers And Thunderstorms Friday
According to the National Weather Service, a weak front will increase shower and thunderstorm chances on Friday, May 8, 2026, with a roughly 80% chance of rain during the afternoon and many cells expected between noon and 4 p.m. Showers and thunderstorms are likely to continue into Friday night before tapering off after midnight, with a low near 52°F. Widespread severe weather is not expected, but individual storms, especially across central and southeast Missouri, could produce brief heavy rain and small hail, and lightning may accompany stronger cells.
Weekend Warmup And Timing
Saturday, May 9, 2026, rebounds into the low 80s with mostly sunny skies before a stronger cold front arrives late Sunday and pushes highs back toward 70°F on May 10. That front brings another chance for showers and isolated storms Sunday morning into early afternoon, then cooler, drier air for early next week. For background on how this developing spring pattern has been evolving, check our earlier coverage.
What To Know For Plans
Carry an umbrella and allow extra travel time Friday afternoon and evening, as lightning, brief downpours and quick ponding on low lying roads are the main commute hazards. If you have outdoor plans Saturday, the sun and low humidity should make it an easy day to shift any washed out Friday activities. If you are taking part in outdoor activities Friday, move inside at the first sign of thunder and avoid standing water.
