Westport, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Westport, a town in Brown County, South Dakota.
This Afternoon
49°F
Slight Chance Light Rain
A slight chance of rain before 5pm, then a slight chance of drizzle. Cloudy, with a high near 49. North northwest wind 16 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.
7-day forecast for Westport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Slight Chance Light Rain | 16 to 24 mph NNW | 16% |
| Tonight | 34°F | Chance Light Rain | 16 mph NNW | 36% |
| Wednesday | 45°F | Chance Light Rain | 15 to 20 mph NNW | 37% |
| Wednesday Night | 30°F | Mostly Cloudy | 12 to 15 mph N | 2% |
| Thursday | 41°F | Partly Sunny | 7 to 14 mph N | 0% |
| Thursday Night | 24°F | Mostly Cloudy | 1 to 6 mph E | 1% |
| Friday | 43°F | Partly Sunny | 2 to 7 mph SSW | 0% |
| Friday Night | 26°F | Partly Cloudy | 6 mph SSW | 0% |
| Saturday | 56°F | Mostly Sunny | 6 to 12 mph WSW | 3% |
| Saturday Night | 31°F | Partly Cloudy | 8 mph W | 2% |
| Sunday | 55°F | Sunny | 6 to 9 mph SW | 1% |
| Sunday Night | 34°F | Partly Cloudy | 8 mph SW | 0% |
| Monday | 58°F | Sunny | 8 to 16 mph WNW | 0% |
| Monday Night | 32°F | Partly Cloudy | 7 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Westport (45.648, -98.498). Updated through the day.
Growing snapshot for Westport
Last spring frost
May 7
First fall frost
Sep 29
Growing season
145 days
Hardiness zone
4a
More local growing data for Westport: nearby ZIP 57426 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Aberdeen
Bath
Bath Corner
Claremont
Columbia
Ferney
Frederick
Grassland Colony
Groton
Hecla
Hutterville Colony
Mansfield
Mina
Prairiewood Village
Stratford
Warner
Wetonka
Climate data from the nearest NOAA station, Columbia 8 N, Sd (9.2 mi from Westport). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.