Groton, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Groton, a city in Brown County, South Dakota.
This Afternoon
67°F
Cloudy
Cloudy. High near 67, with temperatures falling to around 64 in the afternoon. Northeast wind around 9 mph.
7-day forecast for Groton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Cloudy | 9 mph NE | 4% |
| Tonight | 57°F | Mostly Cloudy | 5 to 9 mph NE | 3% |
| Sunday | 64°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph NE | 16% |
| Sunday Night | 49°F | Chance Rain Showers | 5 to 9 mph ENE | 33% |
| Monday | 65°F | Partly Sunny | 7 mph E | 10% |
| Monday Night | 43°F | Partly Cloudy | 6 mph ESE | 1% |
| Tuesday | 68°F | Mostly Sunny | 3 to 12 mph SE | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 10 mph SE | 2% |
| Wednesday | 69°F | Mostly Sunny | 10 to 17 mph SSE | 9% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 12 to 15 mph SSE | 61% |
| Thursday | 72°F | Showers And Thunderstorms Likely | 8 to 12 mph SSE | 61% |
| Thursday Night | 54°F | Mostly Cloudy | 7 mph SSE | 9% |
| Friday | 75°F | Partly Sunny | 6 to 12 mph SSE | 9% |
| Friday Night | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph SSE | 21% |
Forecast source: National Weather Service (api.weather.gov) for Groton (45.452, -98.100). Updated through the day.
Growing snapshot for Groton
Last spring frost
May 6
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
4a
More local growing data for Groton: nearby ZIP 57445 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Aberdeen
Bath
Bath Corner
Claremont
Columbia
Ferney
Frederick
Grassland Colony
Hecla
Hutterville Colony
Mansfield
Mina
Prairiewood Village
Stratford
Warner
Westport
Wetonka
Climate data from the nearest NOAA station, Andover #2, Sd (10.7 mi from Groton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.