Watertown, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Codington County, South Dakota.
Today
42°F
Light Rain
Rain and patchy fog. Cloudy, with a high near 42. Northwest wind 17 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 42°F | Light Rain | 17 to 21 mph NW | 87% |
| Tonight | 33°F | Chance Light Rain then Patchy Fog | 13 to 17 mph NNW | 30% |
| Thursday | 41°F | Patchy Fog then Mostly Cloudy | 12 to 15 mph N | 0% |
| Thursday Night | 27°F | Mostly Cloudy | 0 to 9 mph NE | 0% |
| Friday | 42°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Friday Night | 28°F | Partly Cloudy | 6 mph SSW | 0% |
| Saturday | 52°F | Mostly Sunny | 6 to 13 mph SW | 1% |
| Saturday Night | 33°F | Mostly Clear | 6 to 9 mph W | 0% |
| Sunday | 54°F | Sunny | 6 to 10 mph WSW | 0% |
| Sunday Night | 37°F | Mostly Clear | 8 mph SSW | 0% |
| Monday | 58°F | Mostly Sunny | 8 to 13 mph W | 0% |
| Monday Night | 35°F | Mostly Clear | 3 to 8 mph WNW | 0% |
| Tuesday | 54°F | Mostly Sunny | 3 to 8 mph W | 1% |
| Tuesday Night | 37°F | Partly Cloudy | 6 mph SSW | 1% |
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 Nov 4, 2026.