This morning, Friday, June 12, 2026, St. Louis is waking up to partly cloudy skies and temps near 70°F. A bright, warm afternoon is on tap, with sunshine, a high around 85°F, and a light northwest breeze. The calm will be short-lived - forecasters are eyeing multiple rounds of showers and thunderstorms on Saturday, with the main punch expected late Saturday afternoon into Saturday night.
Timing And Outlook
Friday stays mostly sunny and warm, but a cold front slides southeast into the region on Saturday. Storms could pop as early as Saturday morning, yet the better chance for more widespread and organized thunderstorms arrives late in the afternoon and continues into the evening.
If you have Saturday evening outdoor plans, treat the timing seriously: aim to move them earlier in the day or have a solid indoor backup ready before the front moves through.
Severe And Flooding Risks
Stronger storms Saturday carry a real threat for damaging winds, large hail, and a brief tornado or two. Many spots may instead see damaging straight-line winds if storms consolidate into a line. Heavy downpours Saturday night could trigger localized flash flooding, and some guidance suggests isolated totals of several inches in the hardest-hit pockets - enough to flood low-lying streets and yards, according to the National Weather Service forecast discussion.
Plan Ahead
If your Saturday calendar includes barbecues, ballgames, or patio time, think about shifting those plans earlier or locking in an indoor alternative. Avoid driving through standing water, secure loose outdoor items that could blow around in strong winds, and keep phones charged in case of warnings or power bumps.
For local flood-safety tips and resources, see the Metropolitan St. Louis Sewer District. Cooler, drier weather moves in Sunday with highs in the 70s, followed by a warming trend later next week.
