Todays weather in St. Louis MO - Wednesday - 13 May 2026

St. Louis is stepping into one of the cleaner weather days of mid-May — upper seventies, mostly sunny, comfortable humidity, and not a single active advisory or warning in the region. Wednesday delivers exactly what a good mid-week day should: dry roads from morning commute to evening commute, a light northeast breeze of ten to fifteen miles per hour, and afternoon conditions that make outdoor plans feel easy rather than calculated.For what to wear, light layers work well in the morning. The northeast wind is noticeable but mild, and by mid-morning you'll likely shed that extra layer. Leave the rain gear at home — there's no version of today's forecast that calls for it. Afternoon highs reach the upper seventies under mostly sunny skies, with comfortable humidity and no heavy or sticky air. Tonight eases to around 61 degrees with a calm easterly wind and a few passing clouds — nothing disruptive.Thursday tracks a similar path, keeping the pleasant stretch alive and outdoor plans viable. That matters because Friday brings a confirmed change: a storm system is now on track to move into the St. Louis region. Exact arrival time and storm severity are still being refined by forecast models, so this isn't a declared severe weather event yet — but it is a confirmed shift worth watching.The practical takeaway is straightforward. Wednesday and Thursday represent a clean window before the pattern turns unsettled. Use it. Check back Thursday evening for updated timing and intensity on the Friday system before locking in weekend plans.This episode includes AI-generated content.