Altamont, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a town in Deuel County, South Dakota.
This Afternoon
47°F
Light Rain
Rain. Cloudy. High near 47, with temperatures falling to around 44 in the afternoon. North wind around 22 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Light Rain | 22 mph N | 79% |
| Tonight | 37°F | Light Rain | 22 mph NNW | 90% |
| Wednesday | 43°F | Light Rain | 22 mph NNW | 91% |
| Wednesday Night | 34°F | Light Rain Likely then Mostly Cloudy | 20 mph NNW | 65% |
| Thursday | 41°F | Partly Sunny | 13 to 18 mph N | 7% |
| Thursday Night | 30°F | Mostly Cloudy | 2 to 12 mph N | 0% |
| Friday | 44°F | Partly Sunny | 5 mph SSE | 0% |
| Friday Night | 30°F | Partly Cloudy | 5 to 8 mph SW | 0% |
| Saturday | 54°F | Mostly Sunny | 9 to 14 mph WSW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 12 mph W | 4% |
| Sunday | 56°F | Sunny | 10 mph WSW | 3% |
| Sunday Night | 39°F | Partly Cloudy | 8 to 15 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 12 to 16 mph W | 0% |
| Monday Night | 37°F | Mostly Clear | 7 to 10 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Altamont (44.841, -96.690). Updated through the day.
Growing snapshot for Altamont
Last spring frost
May 7
First fall frost
Oct 1
Growing season
146 days
Hardiness zone
4b
More local growing data for Altamont: nearby ZIP 57226 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Clear Lake, Sd (3.1 mi from Altamont). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.