Altamont, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Altamont, a town in Deuel County, South Dakota.
Overnight
54°F
Patchy Smoke
Patchy smoke. Partly cloudy. Low around 54, with temperatures rising to around 57 overnight. Northwest wind around 3 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Altamont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Patchy Smoke | 3 mph NW | 1% |
| Tuesday | 69°F | Mostly Sunny | 2 to 10 mph NW | 2% |
| Tuesday Night | 52°F | Mostly Clear | 3 to 8 mph WSW | 0% |
| Wednesday | 75°F | Sunny | 8 to 13 mph SW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 7 to 15 mph SSW | 0% |
| Thursday | 80°F | Sunny | 14 to 17 mph SW | 2% |
| Thursday Night | 62°F | Mostly Clear | 9 to 16 mph SSW | 5% |
| Friday | 82°F | Sunny | 9 to 15 mph SSW | 11% |
| Friday Night | 62°F | Mostly Clear | 8 mph SSE | 11% |
| Saturday | 82°F | Sunny | 6 to 14 mph SSE | 8% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms | 12 mph ESE | 24% |
| Sunday | 80°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 12 mph ENE | 24% |
| Sunday Night | 63°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 9 mph E | 23% |
| Monday | 78°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph ENE | 23% |
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 Aug 4, 2026.