St. Charles, MO Weather & Growing Conditions
Today
89°F
Sunny
Sunny, with a high near 89. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Sunny | 6 mph S | 0% |
| Tonight | 70°F | Mostly Clear | 6 mph SE | 0% |
| Wednesday | 91°F | Mostly Sunny | 3 to 7 mph S | 14% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 5 to 8 mph S | 72% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 6 mph S | 72% |
| Thursday Night | 70°F | Slight Chance Showers And Thunderstorms | 2 to 6 mph SE | 23% |
| Friday | 88°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 mph SW | 23% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 5 mph S | 26% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph SW | 26% |
| Saturday Night | 73°F | Mostly Clear | 7 mph S | 6% |
| Sunday | 93°F | Sunny | 6 to 10 mph S | 5% |
| Sunday Night | 75°F | Mostly Clear | 9 mph S | 5% |
| Monday | 94°F | Mostly Sunny | 9 mph SW | 5% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms | 8 mph SW | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, MO
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
6b
Explore more for St. Charles, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Charles Elm Pt, Mo (4.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.