Mehlville, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mehlville, a community in St. Louis County, Missouri.
Overnight
74°F
Mostly Clear
Mostly clear, with a low around 74. South wind around 3 mph.
7-day forecast for Mehlville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 74°F | Mostly Clear | 3 mph S | 2% |
| Saturday | 98°F | Mostly Sunny | 6 mph SW | 5% |
| Saturday Night | 74°F | Partly Cloudy | 5 mph SW | 4% |
| Sunday | 93°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 29% |
| Sunday Night | 68°F | Showers And Thunderstorms Likely | 7 mph NE | 65% |
| Monday | 79°F | Showers And Thunderstorms Likely | 5 to 8 mph N | 65% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 5 to 8 mph N | 57% |
| Tuesday | 71°F | Slight Chance Rain Showers then Partly Sunny | 7 to 10 mph N | 21% |
| Tuesday Night | 55°F | Mostly Cloudy | 5 to 10 mph N | 4% |
| Wednesday | 73°F | Mostly Sunny | 5 to 8 mph N | 1% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 6 mph N | 1% |
| Thursday Night | 59°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 77°F | Partly Sunny | 2 to 6 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Mehlville (38.502, -90.314). Updated through the day.
Growing snapshot for Mehlville
Last spring frost
Apr 6
First fall frost
Oct 27
Growing season
203 days
Hardiness zone
7a
More local growing data for Mehlville: nearby ZIP 63125 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, Cahokia, Il (6.3 mi from Mehlville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.