Gann Valley, SD Weather & Growing Conditions
Today
65°F
Patchy Fog then Mostly Cloudy
Patchy fog before noon. Mostly cloudy. High near 65, with temperatures falling to around 62 in the afternoon. North northeast wind around 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Patchy Fog then Mostly Cloudy | 13 mph NNE | 3% |
| Tonight | 52°F | Cloudy | 9 to 13 mph NE | 11% |
| Sunday | 62°F | Chance Rain Showers | 15 mph ENE | 48% |
| Sunday Night | 49°F | Rain Showers | 13 mph ENE | 84% |
| Monday | 61°F | Rain Showers | 10 mph E | 84% |
| Monday Night | 45°F | Mostly Cloudy | 9 mph ESE | 9% |
| Tuesday | 64°F | Partly Sunny | 8 to 16 mph SE | 9% |
| Tuesday Night | 48°F | Mostly Cloudy | 15 mph SE | 10% |
| Wednesday | 68°F | Partly Sunny then Slight Chance Rain Showers | 18 mph SSE | 17% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 16 mph SSE | 38% |
| Thursday | 71°F | Chance Rain Showers then Partly Sunny | 14 mph SSE | 38% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 12 mph SE | 15% |
| Friday | 72°F | Slight Chance Rain Showers then Partly Sunny | 12 to 17 mph SE | 15% |
| Friday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph SE | 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 Sep 19, 2026.