This morning, Friday, June 19, St. Louis wakes up to patchy river-valley fog and cool air around 61°F. The fog should clear shortly after sunrise, with the day turning mostly sunny and a high near 84°F. Northwest winds stay light at about 0–3 mph, so once visibility improves, most outdoor Juneteenth plans should feel comfortably mild.
Morning Fog, Sunny Afternoon
Expect the patchy fog to burn off quickly as the sun climbs, with temperatures moving from the mid-60s into the low-80s by midday. Mostly sunny skies and calm conditions are expected through the afternoon, creating a solid window for daytime events, errands and outdoor celebrations before the next weather shift.
Storm Window: Late Saturday Night Through Monday
Late Saturday night into Monday afternoon, the mood changes. Multiple rounds of showers and thunderstorms could roll through, bringing locally heavy rainfall and gusty winds. The National Weather Service highlights a roughly 36-hour window when organized storms may produce efficient, heavy rain and raise the risk of localized flash flooding.
Sunday is currently forecast to bring showers and thunderstorms with a high near 85°F and south winds of 7–14 mph, with gusts up to 25 mph in stronger storms, a setup that can fuel quick downpours and runoff. For context on how the forecast has shifted over the last week, you can compare this outlook with the June 14 discussion.
Plan Ahead
Keep an eye on any watches and warnings Sunday and Monday, and avoid driving through standing water if storms hit hard. It is also a good idea to secure lightweight outdoor items before the weekend in case gusty winds develop. Check radar and the latest updates on the morning of any event so you can pivot quickly if a heavy band of rain sets up over your neighborhood.
