Fenton, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fenton, a city in Jefferson County, Missouri.
This Afternoon
74°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 74, with temperatures falling to around 67 in the afternoon. South wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%.
7-day forecast for Fenton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Rain | 16 mph S | 96% |
| Tonight | 53°F | Light Rain | 6 to 13 mph SW | 88% |
| Wednesday | 63°F | Mostly Cloudy | 6 to 12 mph W | 3% |
| Wednesday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 3 to 8 mph W | 2% |
| Thursday Night | 43°F | Mostly Cloudy | 5 mph NW | 11% |
| Friday | 58°F | Partly Sunny | 3 to 8 mph NW | 5% |
| Friday Night | 39°F | Mostly Cloudy | 1 to 5 mph N | 2% |
| Saturday | 57°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 62°F | Sunny | 1 to 5 mph W | 9% |
| Sunday Night | 36°F | Mostly Clear | 3 mph W | 5% |
| Monday | 67°F | Sunny | 5 mph SW | 2% |
| Monday Night | 41°F | Mostly Clear | 3 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Fenton (38.529, -90.451). Updated through the day.
Growing snapshot for Fenton
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
More local growing data for Fenton: nearby ZIP 63026 weather · frost dates · planting calendar · Missouri frost dates
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Summer Set
Climate data from the nearest NOAA station, St Charles 7 Ssw, Mo (13.1 mi from Fenton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.