Grenville, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grenville, a town in Day County, South Dakota.
Overnight
56°F
Areas Of Fog
Areas of fog and a slight chance of drizzle. Cloudy. Low around 56, with temperatures rising to around 59 overnight. East northeast wind around 10 mph.
7-day forecast for Grenville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Areas Of Fog | 10 mph ENE | 11% |
| Saturday | 64°F | Areas Of Fog | 8 to 12 mph NE | 9% |
| Saturday Night | 52°F | Mostly Cloudy then Slight Chance Rain Showers | 8 to 12 mph NE | 16% |
| Sunday | 62°F | Mostly Cloudy | 13 mph NE | 13% |
| Sunday Night | 48°F | Mostly Cloudy | 9 mph E | 6% |
| Monday | 63°F | Partly Sunny | 9 mph E | 6% |
| Monday Night | 46°F | Partly Cloudy | 7 mph ESE | 6% |
| Tuesday | 64°F | Mostly Sunny | 6 to 13 mph SE | 1% |
| Tuesday Night | 50°F | Partly Cloudy | 12 mph SSE | 8% |
| Wednesday | 66°F | Partly Sunny | 10 to 14 mph SSE | 12% |
| Wednesday Night | 54°F | Chance Rain Showers | 10 mph SSE | 27% |
| Thursday | 69°F | Chance Rain Showers then Partly Sunny | 9 mph S | 27% |
| Thursday Night | 55°F | Partly Cloudy | 8 mph SSE | 12% |
| Friday | 70°F | Partly Sunny | 8 to 12 mph SSE | 12% |
Forecast source: National Weather Service (api.weather.gov) for Grenville (45.467, -97.390). Updated through the day.
Growing snapshot for Grenville
Last spring frost
May 1
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
4b
More local growing data for Grenville: nearby ZIP 57239 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Waubay Natl Wild Life, Sd (6 mi from Grenville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.