Alton, MO Weather & Growing Conditions
Tonight
49°F
Isolated Rain Showers then Mostly Cloudy
Isolated rain showers before 10pm. Mostly cloudy, with a low around 49. Wind chill values as low as 48. Southwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Isolated Rain Showers then Mostly Cloudy | 6 mph SW | 22% |
| Wednesday | 64°F | Mostly Sunny | 5 to 9 mph W | 4% |
| Wednesday Night | 38°F | Mostly Clear | 3 mph W | 0% |
| Thursday | 70°F | Sunny | 1 to 5 mph SW | 1% |
| Thursday Night | 41°F | Mostly Cloudy | 5 mph NW | 9% |
| Friday | 63°F | Partly Sunny | 7 mph N | 0% |
| Friday Night | 37°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 60°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph NW | 2% |
| Sunday | 64°F | Sunny | 5 mph NW | 6% |
| Sunday Night | 33°F | Mostly Clear | 3 mph W | 1% |
| Monday | 68°F | Sunny | 5 mph W | 1% |
| Monday Night | 36°F | Mostly Clear | 3 mph SW | 0% |
| Tuesday | 72°F | Sunny | 3 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Alton, MO
Last spring frost
Apr 17
First fall frost
Oct 21
Growing season
187 days
Hardiness zone
7a
Explore more for Alton, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Alton, Mo (2.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.