Groton, SD Weather & Growing Conditions
Today
45°F
Light Rain Likely
Rain likely before 2pm. Cloudy, with a high near 45. North northwest wind 15 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 45°F | Light Rain Likely | 15 to 20 mph NNW | 67% |
| Tonight | 31°F | Mostly Cloudy then Patchy Fog | 14 mph NNW | 1% |
| Thursday | 40°F | Mostly Cloudy | 7 to 14 mph N | 0% |
| Thursday Night | 24°F | Mostly Cloudy | 1 to 6 mph E | 0% |
| Friday | 41°F | Mostly Sunny | 1 to 6 mph S | 0% |
| Friday Night | 26°F | Partly Cloudy | 7 mph S | 0% |
| Saturday | 53°F | Sunny | 7 to 10 mph SW | 1% |
| Saturday Night | 31°F | Mostly Clear | 3 to 7 mph WSW | 0% |
| Sunday | 54°F | Sunny | 3 to 9 mph SSW | 0% |
| Sunday Night | 35°F | Partly Cloudy | 8 mph SSW | 0% |
| Monday | 59°F | Mostly Sunny | 6 to 9 mph W | 0% |
| Monday Night | 32°F | Mostly Clear | 2 to 6 mph WNW | 0% |
| Tuesday | 54°F | Mostly Sunny | 2 to 6 mph WSW | 1% |
| Tuesday Night | 35°F | Partly Cloudy | 5 mph S | 1% |
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 Nov 4, 2026.