Grenville, SD Weather & Growing Conditions
Today
70°F
Sunny
Sunny, with a high near 70. West northwest wind 10 to 14 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Sunny | 10 to 14 mph WNW | 0% |
| Tonight | 54°F | Mostly Clear | 5 to 9 mph SW | 0% |
| Wednesday | 77°F | Sunny | 8 to 13 mph SW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 8 to 15 mph SSW | 1% |
| Thursday | 81°F | Sunny | 13 to 16 mph SW | 5% |
| Thursday Night | 63°F | Mostly Clear | 12 mph SSW | 6% |
| Friday | 82°F | Sunny | 12 mph WSW | 7% |
| Friday Night | 62°F | Mostly Clear | 6 to 9 mph E | 7% |
| Saturday | 82°F | Sunny | 7 to 13 mph ESE | 10% |
| Saturday Night | 62°F | Slight Chance Showers And Thunderstorms | 12 mph E | 20% |
| Sunday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 12 mph ENE | 17% |
| Sunday Night | 62°F | Partly Cloudy then Chance Rain Showers | 10 mph E | 29% |
| Monday | 77°F | Chance Rain Showers | 13 mph ENE | 29% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms | 12 mph NE | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grenville, SD
Last spring frost
May 1
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
4b
Explore more for Grenville, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Waubay Natl Wild Life, Sd (6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.