Historical weather data, all-time temperature records, and monthly climate averages for Mehlville, MO. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Mehlville typically lands in that transitional sweet spot — expect a high near 62° and a low around 42°. The date has seen wild swings over the years, from a balmy 84° in 2023 to a freezing 28° back in 2002. Rain is possible but unlikely, with just a 29% chance of precipitation and essentially no shot at snow.
Mehlville earns its Midwest stripes with some serious extremes — the thermometer has hit 107° in June and crashed to -14° in January, a swing of 121 degrees. A single July day in 2022 dumped 7.23 inches of rain, and New Year's Day 2015 brought 9 inches of snow to kick off the year.
Summer is the main event here, with highs averaging 91° in late July and a sultry stretch from June through August that rarely dips below the mid-80s. If you're avoiding heat, aim for the shoulder seasons — April and October both sit in the comfortable 68–70° range. Late June through early July is the wettest stretch, averaging 1.41 inches in a single week, while winters are cold but manageable with January highs only reaching the low 40s.