Gann Valley, SD Weather & Growing Conditions
Today
70°F
Patchy Smoke then Partly Sunny
Patchy smoke between 8am and 10am. Partly sunny, with a high near 70. Northwest wind 8 to 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Patchy Smoke then Partly Sunny | 8 to 12 mph NW | 7% |
| Tonight | 54°F | Partly Cloudy | 3 to 7 mph SW | 1% |
| Wednesday | 78°F | Mostly Sunny | 5 to 12 mph SSW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 13 mph S | 2% |
| Thursday | 86°F | Sunny | 9 to 14 mph SSW | 3% |
| Thursday Night | 64°F | Mostly Clear | 12 mph S | 6% |
| Friday | 89°F | Sunny | 9 mph SSW | 6% |
| Friday Night | 65°F | Mostly Clear | 9 mph ESE | 5% |
| Saturday | 91°F | Sunny | 9 to 18 mph SE | 5% |
| Saturday Night | 65°F | Mostly Clear | 9 to 16 mph ESE | 10% |
| Sunday | 88°F | Mostly Sunny | 9 to 16 mph E | 6% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 15 mph E | 29% |
| Monday | 86°F | Chance Showers And Thunderstorms then Partly Sunny | 15 mph ENE | 29% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms | 15 mph ENE | 19% |
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 Aug 4, 2026.