Watertown, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Codington County, South Dakota.
Overnight
56°F
Areas Of Fog
Areas of fog and a slight chance of drizzle. Mostly cloudy, with a low around 56. Northeast wind around 5 mph.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Areas Of Fog | 5 mph NE | 7% |
| Saturday | 63°F | Areas Of Fog then Cloudy | 5 to 13 mph NE | 13% |
| Saturday Night | 48°F | Mostly Cloudy | 8 to 13 mph NE | 10% |
| Sunday | 64°F | Mostly Cloudy | 14 mph ENE | 8% |
| Sunday Night | 45°F | Cloudy | 8 to 13 mph ENE | 14% |
| Monday | 63°F | Mostly Cloudy | 10 mph E | 14% |
| Monday Night | 42°F | Partly Cloudy | 5 to 9 mph ESE | 4% |
| Tuesday | 65°F | Mostly Sunny | 5 to 13 mph SE | 4% |
| Tuesday Night | 43°F | Partly Cloudy | 10 mph SE | 2% |
| Wednesday | 68°F | Mostly Sunny | 10 to 15 mph SSE | 9% |
| Wednesday Night | 48°F | Chance Rain Showers | 12 mph SSE | 27% |
| Thursday | 70°F | Chance Rain Showers then Partly Sunny | 9 to 13 mph SSE | 27% |
| Thursday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 7 to 10 mph SSE | 15% |
| Friday | 72°F | Slight Chance Rain Showers then Partly Sunny | 8 to 14 mph SSE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Watertown (44.909, -97.156). Updated through the day.
Growing snapshot for Watertown
Last spring frost
May 7
First fall frost
Sep 30
Growing season
145 days
Hardiness zone
4b
More local growing data for Watertown: nearby ZIP 57201 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Watertown Rgnl Ap, Sd (3.5 mi from Watertown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.