Altamont, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a town in Deuel County, South Dakota.
Tonight
38°F
Light Rain
Rain and areas of fog. Cloudy, with a low around 38. North northwest wind around 21 mph, with gusts as high as 36 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Light Rain | 21 mph NNW | 90% |
| Wednesday | 43°F | Light Rain | 22 mph NNW | 91% |
| Wednesday Night | 34°F | Light Rain Likely | 20 mph NNW | 65% |
| Thursday | 41°F | Patchy Fog then 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% |
| Tuesday | 54°F | Mostly Sunny | 9 mph W | 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 4, 2026.