Grenville, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grenville, a town in Day County, South Dakota.
Today
70°F
Sunny
Sunny, with a high near 70. West northwest wind 8 to 12 mph, with gusts as high as 21 mph.
7-day forecast for Grenville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Sunny | 8 to 12 mph WNW | 0% |
| Tonight | 55°F | Mostly Clear | 3 to 8 mph SSW | 0% |
| Wednesday | 77°F | Sunny | 8 to 12 mph SW | 0% |
| Wednesday Night | 61°F | Partly Cloudy | 8 to 14 mph SSW | 1% |
| Thursday | 81°F | Sunny | 12 to 15 mph SSW | 5% |
| Thursday Night | 63°F | Mostly Clear | 12 mph SSW | 6% |
| Friday | 82°F | Sunny | 10 mph SW | 7% |
| Friday Night | 63°F | Mostly Clear | 8 mph E | 7% |
| Saturday | 82°F | Sunny | 7 to 13 mph ESE | 9% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms | 13 mph E | 19% |
| Sunday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 10 mph ENE | 15% |
| Sunday Night | 63°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph E | 29% |
| Monday | 77°F | Chance Showers And Thunderstorms then Partly Sunny | 13 mph ENE | 29% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms | 12 mph NE | 21% |
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 Aug 4, 2026.