Fort Thompson, SD Weather & Growing Conditions
This Afternoon
46°F
Cloudy
Cloudy. High near 46, with temperatures falling to around 43 in the afternoon. North northwest wind around 23 mph, with gusts as high as 32 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Cloudy | 23 mph NNW | 6% |
| Tonight | 36°F | Cloudy | 14 to 20 mph NW | 7% |
| Wednesday | 47°F | Chance Light Rain | 15 to 18 mph NW | 25% |
| Wednesday Night | 34°F | Mostly Cloudy | 14 mph NW | 9% |
| Thursday | 49°F | Mostly Sunny | 6 to 12 mph N | 0% |
| Thursday Night | 29°F | Partly Cloudy | 6 mph E | 0% |
| Friday | 48°F | Partly Sunny | 3 to 7 mph SSE | 0% |
| Friday Night | 31°F | Partly Cloudy | 5 mph S | 0% |
| Saturday | 59°F | Mostly Sunny | 3 to 10 mph WSW | 5% |
| Saturday Night | 35°F | Mostly Clear | 7 mph W | 1% |
| Sunday | 60°F | Sunny | 5 to 9 mph SSW | 0% |
| Sunday Night | 39°F | Mostly Clear | 9 mph SSW | 0% |
| Monday | 61°F | Sunny | 8 to 15 mph NW | 0% |
| Monday Night | 37°F | Partly Cloudy | 7 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fort Thompson, SD
Last spring frost
May 6
First fall frost
Oct 5
Growing season
152 days
Hardiness zone
4b
Explore more for Fort Thompson, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Lake Sharpe Prj, Sd (4.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.