St. Louis, Missouri – Hot, sticky weather will grip Missouri through the weekend, with daily rounds of thunderstorms and a dangerous heat index expected to peak on Friday.
According to the National Weather Service in St. Louis, temperatures will reach 87–93°F on Thursday and climb to 90–95°F on Friday, when heat index values could soar as high as 105°F. Scattered showers and thunderstorms—ranging from a 20% to 60% chance—could disrupt travel and outdoor plans across the region each day, especially during the afternoon and evening.
St. Louis and surrounding counties, including Jefferson, St. Charles, and Franklin, are likely to see downpours, gusty winds, and lightning. Interstate 70 and other major roadways may experience ponding or slowdowns during heavier storms. Residents should plan for muggy nights as lows remain in the upper 60s to mid-70s.
If you have outdoor plans, schedule them for early morning or after sunset, drink plenty of water, and check for lightning alerts before heading out. Those sensitive to heat, including young children and the elderly, should take extra precautions or stay indoors.
Warm, humid conditions with on-and-off storms are likely to persist until Sunday night. More advisories may be issued if Friday’s heat intensifies or storms become severe.
