Groton, SD Weather & Growing Conditions
Overnight
57°F
Patchy Fog
Patchy fog. Cloudy, with a low around 57. Northeast wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Patchy Fog | 8 mph NE | 2% |
| Saturday | 67°F | Patchy Fog then Cloudy | 8 to 12 mph NNE | 3% |
| Saturday Night | 51°F | Mostly Cloudy | 6 to 10 mph NE | 5% |
| Sunday | 67°F | Mostly Cloudy | 13 mph NE | 7% |
| Sunday Night | 48°F | Mostly Cloudy | 5 to 9 mph E | 9% |
| Monday | 68°F | Partly Sunny | 8 mph E | 9% |
| Monday Night | 44°F | Partly Cloudy | 7 mph ESE | 7% |
| Tuesday | 69°F | Mostly Sunny | 5 to 14 mph SSE | 1% |
| Tuesday Night | 48°F | Partly Cloudy | 12 mph SSE | 4% |
| Wednesday | 71°F | Partly Sunny | 13 to 17 mph SSE | 14% |
| Wednesday Night | 52°F | Chance Rain Showers | 13 mph SSE | 30% |
| Thursday | 72°F | Chance Rain Showers then Partly Sunny | 12 mph SSE | 30% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 9 mph SSE | 21% |
| Friday | 75°F | Slight Chance Rain Showers then Partly Sunny | 8 to 15 mph SSE | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Groton, SD
Last spring frost
May 6
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
4a
Explore more for Groton, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Andover #2, Sd (10.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.