Alton, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alton, a city in Oregon County, Missouri.
This Afternoon
100°F
Sunny
Sunny. High near 100, with temperatures falling to around 98 in the afternoon. Heat index values as high as 104. South wind around 3 mph.
7-day forecast for Alton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 100°F | Sunny | 3 mph S | 9% |
| Tonight | 70°F | Mostly Clear | 2 mph SW | 5% |
| Saturday | 100°F | Sunny | 2 to 6 mph SW | 1% |
| Saturday Night | 70°F | Mostly Clear | 5 mph SW | 0% |
| Sunday | 99°F | Mostly Sunny | 2 to 6 mph W | 0% |
| Sunday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph NW | 16% |
| Monday | 92°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph N | 53% |
| Monday Night | 62°F | Chance Showers And Thunderstorms | 5 mph N | 53% |
| Tuesday | 83°F | Partly Sunny | 7 mph N | 13% |
| Tuesday Night | 56°F | Partly Cloudy | 5 to 8 mph N | 7% |
| Wednesday | 81°F | Mostly Sunny | 6 mph N | 2% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph NE | 0% |
| Thursday | 82°F | Sunny | 5 mph NE | 3% |
| Thursday Night | 56°F | Partly Cloudy | 3 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Alton (36.691, -91.392). Updated through the day.
Growing snapshot for Alton
Last spring frost
Apr 17
First fall frost
Oct 21
Growing season
187 days
Hardiness zone
7a
More local growing data for Alton: nearby ZIP 65606 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Alton, Mo (2.2 mi from Alton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.