Gann Valley, SD Weather & Growing Conditions
This Afternoon
46°F
Slight Chance Light Rain
A slight chance of rain. Cloudy. High near 46, with temperatures falling to around 42 in the afternoon. North northwest wind around 26 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Slight Chance Light Rain | 26 mph NNW | 16% |
| Tonight | 36°F | Slight Chance Light Rain | 14 to 23 mph NNW | 16% |
| Wednesday | 46°F | Chance Light Rain | 15 to 18 mph NW | 46% |
| Wednesday Night | 33°F | Mostly Cloudy | 14 mph NNW | 14% |
| Thursday | 47°F | Mostly Sunny | 7 to 13 mph N | 1% |
| Thursday Night | 27°F | Partly Cloudy | 6 mph ENE | 0% |
| Friday | 47°F | Mostly Sunny | 3 to 7 mph SSE | 0% |
| Friday Night | 30°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 57°F | Mostly Sunny | 5 to 12 mph W | 4% |
| Saturday Night | 34°F | Mostly Clear | 7 mph WNW | 2% |
| Sunday | 59°F | Sunny | 5 to 9 mph SSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 10 mph SSW | 0% |
| Monday | 59°F | Sunny | 9 to 15 mph NW | 0% |
| Monday Night | 36°F | Partly Cloudy | 7 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Gann Valley, SD
Last spring frost
May 6
First fall frost
Oct 1
Growing season
148 days
Hardiness zone
4b
Explore more for Gann Valley, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Gann Valley 4Nw, Sd (3.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.