St. Louis woke up mostly clear Monday morning, July 27, 2026, with temperatures already near 79°F and a brutally hot afternoon locked in. Forecasters say highs will push near 100°F, and the humidity will crank the heat index to a dangerous 110–115°F at peak. Officials are urging residents to stay indoors if possible, skip strenuous outdoor work, and check on vulnerable neighbors and pets.
Today and Tonight
An Extreme Heat Warning from the National Weather Service remains in effect for the St. Louis metro until 9 p.m. CDT Monday, July 27, 2026, with heat index values expected to reach 110–115°F this afternoon, according to NWS St. Louis. Actual air temperatures should top out near 100°F, with light southwest winds around 2–7 mph offering little help. Urban neighborhoods and spots with limited shade will be especially tough to cool down.
Late-Day Storm Threat
There is a small 20% chance of showers or thunderstorms late in the day, mainly after 5 p.m. If storms do manage to pop, they could be strong, bringing damaging wind gusts and brief but intense downpours. Forecasters say any storm activity would likely arrive around or just after peak heating and should be short-lived, so anyone with outdoor evening plans should have a backup option ready.
Cooling Help and Safety
Residents without air conditioning are urged to head to an air-conditioned public space. The city maintains a list of cooling centers and hours, and United Way 2-1-1 can help you find a location near you, according to the city's resources at City of St. Louis. For immediate assistance, call 2-1-1 or United Way at 1-800-427-4626, or Cool Down St. Louis at 314-241-7668. Never leave children or pets in parked vehicles, and call 911 right away if someone shows signs of heat stroke.
Short Term Outlook
Some relief should arrive Tuesday when a weak front brings slightly cooler, drier air and drops afternoon highs into the low to mid-90s, with lower heat index values. Through the rest of the week, temperatures trend closer to seasonal levels, although spotty storms remain possible later in the week. Anyone with outdoor plans should keep an eye on local forecasts.
