Gann Valley, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gann Valley, a community in Buffalo County, South Dakota.
This Afternoon
47°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 47. North northwest wind 22 to 28 mph, with gusts as high as 48 mph. Chance of precipitation is 40%.
7-day forecast for Gann Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 47°F | Chance Light Rain | 22 to 28 mph NNW | 36% |
| Tonight | 35°F | Slight Chance Light Rain | 12 to 16 mph NNW | 21% |
| Wednesday | 47°F | Chance Light Rain | 14 to 18 mph NW | 53% |
| Wednesday Night | 33°F | Slight Chance Light Rain then Mostly Cloudy | 9 to 13 mph NW | 15% |
| Thursday | 48°F | Mostly Sunny | 8 to 13 mph N | 1% |
| Thursday Night | 27°F | Partly Cloudy | 1 to 6 mph ENE | 0% |
| Friday | 48°F | Mostly Sunny | 2 to 6 mph SSE | 0% |
| Friday Night | 29°F | Partly Cloudy | 3 mph SSW | 0% |
| Saturday | 57°F | Mostly Sunny | 3 to 12 mph W | 5% |
| Saturday Night | 33°F | Mostly Clear | 6 mph WNW | 2% |
| Sunday | 59°F | Sunny | 3 to 9 mph SSW | 0% |
| Sunday Night | 38°F | Mostly Clear | 8 mph SSW | 0% |
| Monday | 60°F | Sunny | 7 to 15 mph NW | 0% |
| Monday Night | 36°F | Partly Cloudy | 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Gann Valley (44.034, -98.988). Updated through the day.
Growing snapshot for Gann Valley
Last spring frost
May 6
First fall frost
Oct 1
Growing season
148 days
Hardiness zone
4b
More local growing data for Gann Valley: nearby ZIP 57341 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Gann Valley 4Nw, Sd (3.5 mi from Gann Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.