St. Louis is waking up clear and calm Saturday, with temperatures in the low 60s before a mostly sunny afternoon pushes the mercury to around 90. The comfortable start is brief: the forecast turns hotter Sunday and stays locked into the upper 90s to around 100 through much of next week.
Saturday Starts The Climb
Saturday's best window for outdoor plans comes before late afternoon, when temperatures rise through the 80s and peak near 90. Southeast winds stay light at 1 to 7 mph, and rain is not expected.
Sunday Through Wednesday Bring The Real Heat
Sunday reaches about 95 degrees, followed by a high near 99 Monday and around 100 Tuesday and Wednesday. Overnight lows will range from the mid-70s to around 80, leaving limited relief after sunset. The National Weather Service says humidity will be the swing factor in whether heat-related headlines become necessary, though no watches, warnings or advisories are currently posted.
That is a hotter and more persistent turn than Hoodline's Friday outlook, which called for a warmer weekend before the bigger heat push. The latest forecast now places Monday through Wednesday at 99 to 100 degrees, while overnight temperatures remain unusually warm.
Small Rain Chance Arrives Late Week
Thursday stays mostly sunny with a high near 99, although a slight chance of showers develops after 1 a.m. Friday brings mostly sunny skies and a high near 97, with a 20% chance of showers before early afternoon. Otherwise, the stretch remains largely dry.
Plan Around The Afternoon Heat
Saturday's 90-degree afternoon will be manageable for many plans, but the week ahead calls for more caution during the hottest hours. Drink plenty of water, seek shade or air conditioning, take breaks from strenuous activity and check on older adults, children and pets as temperatures approach 100.
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