Westport, SD Weather & Growing Conditions
Tonight
54°F
Areas Of Fog
Areas of fog and patchy drizzle. Cloudy, with a low around 54. Northeast wind around 9 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Areas Of Fog | 9 mph NE | 18% |
| Saturday | 67°F | Areas Of Fog | 9 to 13 mph NE | 2% |
| Saturday Night | 52°F | Cloudy | 8 to 12 mph NE | 8% |
| Sunday | 66°F | Cloudy | 10 to 14 mph NE | 14% |
| Sunday Night | 49°F | Chance Rain Showers | 6 to 9 mph ENE | 31% |
| Monday | 65°F | Chance Rain Showers then Mostly Cloudy | 8 mph E | 31% |
| Monday Night | 45°F | Mostly Cloudy | 7 mph ESE | 2% |
| Tuesday | 68°F | Partly Sunny | 5 to 13 mph SE | 2% |
| Tuesday Night | 49°F | Mostly Cloudy | 10 mph SSE | 13% |
| Wednesday | 70°F | Mostly Cloudy then Slight Chance Rain Showers | 12 to 16 mph SSE | 16% |
| Wednesday Night | 52°F | Chance Rain Showers | 7 to 13 mph SSE | 25% |
| Thursday | 72°F | Chance Rain Showers then Partly Sunny | 9 mph SSE | 25% |
| Thursday Night | 53°F | Partly Cloudy | 7 mph SE | 11% |
| Friday | 73°F | Partly Sunny | 7 to 14 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Westport, SD
Last spring frost
May 7
First fall frost
Sep 29
Growing season
145 days
Hardiness zone
4a
Explore more for Westport, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Columbia 8 N, Sd (9.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.