Alton, MO Weather & Growing Conditions
This Afternoon
67°F
Mostly Sunny
Mostly sunny. High near 67, with temperatures falling to around 62 in the afternoon. West wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Mostly Sunny | 7 mph W | 0% |
| Tonight | 40°F | Mostly Clear | 3 mph W | 0% |
| Thursday | 69°F | Sunny | 1 to 5 mph W | 1% |
| Thursday Night | 41°F | Mostly Clear | 3 mph NW | 5% |
| Friday | 61°F | Partly Sunny | 3 to 7 mph N | 0% |
| Friday Night | 33°F | Mostly Clear then Areas Of Frost | 2 to 6 mph N | 0% |
| Saturday | 57°F | Areas Of Frost then Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 30°F | Partly Cloudy | 1 mph N | 0% |
| Sunday | 62°F | Sunny | 3 mph N | 0% |
| Sunday Night | 31°F | Mostly Clear | 1 mph NW | 0% |
| Monday | 65°F | Sunny | 0 to 3 mph SW | 0% |
| Monday Night | 34°F | Mostly Clear | 2 mph W | 1% |
| Tuesday | 68°F | Sunny | 3 mph NW | 1% |
| Tuesday Night | 37°F | Mostly Clear | 2 mph NW | 3% |
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 (10.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.