Watertown, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Watertown, a city in Codington County, South Dakota.
Today
70°F
Mostly Sunny
Mostly sunny, with a high near 70. Northwest wind 9 to 13 mph.
7-day forecast for Watertown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Mostly Sunny | 9 to 13 mph NW | 1% |
| Tonight | 51°F | Mostly Clear | 0 to 8 mph SW | 0% |
| Wednesday | 77°F | Sunny | 6 to 13 mph SSW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 12 mph SSW | 1% |
| Thursday | 81°F | Sunny | 12 to 16 mph SSW | 4% |
| Thursday Night | 61°F | Mostly Clear | 12 mph SSW | 4% |
| Friday | 83°F | Sunny | 12 mph SSW | 10% |
| Friday Night | 61°F | Mostly Clear | 5 to 9 mph SE | 10% |
| Saturday | 84°F | Sunny | 7 to 14 mph SE | 6% |
| Saturday Night | 62°F | Slight Chance Showers And Thunderstorms | 13 mph ESE | 20% |
| Sunday | 81°F | Slight Chance Rain Showers then Mostly Sunny | 9 to 13 mph E | 18% |
| Sunday Night | 62°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 mph E | 23% |
| Monday | 79°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 10 to 14 mph ENE | 23% |
| Monday Night | 60°F | Slight Chance Showers And Thunderstorms | 9 to 14 mph NE | 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 Aug 4, 2026.