Watertown, SD Weather & Growing Conditions
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 7 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Areas Of Fog | 7 mph NE | 18% |
| Saturday | 63°F | Areas Of Fog | 7 to 13 mph NE | 15% |
| Saturday Night | 51°F | Patchy Fog then Mostly Cloudy | 7 to 13 mph NE | 12% |
| Sunday | 64°F | Mostly Cloudy | 12 to 15 mph NE | 9% |
| Sunday Night | 47°F | Cloudy | 8 to 13 mph ENE | 13% |
| Monday | 64°F | Partly Sunny | 10 mph E | 13% |
| Monday Night | 43°F | Partly Cloudy | 5 to 8 mph ESE | 4% |
| Tuesday | 66°F | Mostly Sunny | 5 to 13 mph SE | 4% |
| Tuesday Night | 45°F | Partly Cloudy | 10 mph SE | 2% |
| Wednesday | 68°F | Mostly Sunny | 9 to 14 mph SSE | 9% |
| Wednesday Night | 50°F | Chance Rain Showers | 10 mph SSE | 27% |
| Thursday | 70°F | Chance Rain Showers then Partly Sunny | 9 to 13 mph SSE | 27% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 9 mph SSE | 15% |
| Friday | 72°F | Slight Chance Rain Showers then Partly Sunny | 7 to 14 mph SSE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Watertown, SD
Last spring frost
May 7
First fall frost
Sep 30
Growing season
145 days
Hardiness zone
4b
Explore more for Watertown, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Watertown Rgnl Ap, Sd (3.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.