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.
Today
71°F
Partly Sunny
Partly sunny, with a high near 71. Northwest wind 8 to 12 mph.
7-day forecast for Gann Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Partly Sunny | 8 to 12 mph NW | 7% |
| Tonight | 54°F | Partly Cloudy | 2 to 7 mph SW | 2% |
| Wednesday | 79°F | Mostly Sunny | 3 to 12 mph SSW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 7 to 12 mph S | 1% |
| Thursday | 87°F | Mostly Sunny | 7 to 15 mph S | 4% |
| Thursday Night | 64°F | Mostly Clear | 8 to 12 mph S | 6% |
| Friday | 90°F | Sunny | 9 mph SSW | 6% |
| Friday Night | 65°F | Mostly Clear | 9 mph ESE | 5% |
| Saturday | 92°F | Sunny | 8 to 18 mph SE | 5% |
| Saturday Night | 65°F | Mostly Clear | 8 to 17 mph ESE | 10% |
| Sunday | 89°F | Mostly Sunny | 9 to 16 mph E | 7% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 12 to 15 mph E | 27% |
| Monday | 88°F | Chance Showers And Thunderstorms then Partly Sunny | 12 to 16 mph ENE | 27% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms | 12 to 16 mph ENE | 18% |
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 Aug 4, 2026.