Watertown, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Codington County, South Dakota.
Overnight
37°F
Light Rain
Rain and patchy fog. Cloudy. Low around 37, with temperatures rising to around 40 overnight. North northwest wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Light Rain | 20 mph NNW | 86% |
| Wednesday | 42°F | Light Rain | 18 mph NNW | 90% |
| Wednesday Night | 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% |
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.