Grenville, SD Weather & Growing Conditions
Tonight
36°F
Light Rain
Rain likely and patchy fog before 11pm, then areas of fog and a chance of rain between 11pm and midnight, then rain and areas of fog. Cloudy. Low around 36, with temperatures rising to around 39 overnight. North northwest wind 15 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 36°F | Light Rain | 15 to 21 mph NNW | 85% |
| Wednesday | 41°F | Light Rain | 17 to 21 mph NNW | 86% |
| Wednesday Night | 32°F | Patchy Fog | 14 to 17 mph NNW | 24% |
| Thursday | 38°F | Patchy Fog then Partly Sunny | 9 to 16 mph N | 3% |
| Thursday Night | 29°F | Mostly Cloudy | 2 to 8 mph ENE | 0% |
| Friday | 42°F | Partly Sunny | 2 to 6 mph S | 0% |
| Friday Night | 31°F | Partly Cloudy | 5 to 8 mph SW | 0% |
| Saturday | 52°F | Mostly Sunny | 8 to 14 mph WSW | 5% |
| Saturday Night | 35°F | Partly Cloudy | 7 to 10 mph WNW | 4% |
| Sunday | 53°F | Sunny | 7 to 10 mph WSW | 2% |
| Sunday Night | 39°F | Partly Cloudy | 8 to 12 mph SW | 0% |
| Monday | 55°F | Mostly Sunny | 12 to 17 mph W | 0% |
| Monday Night | 37°F | Mostly Clear | 6 to 9 mph W | 0% |
| Tuesday | 51°F | Mostly Sunny | 6 to 9 mph W | 0% |
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 Nov 4, 2026.