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
64°F
Areas Of Drizzle
Areas of drizzle and patchy fog. Cloudy, with a high near 64. East wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Westport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Areas Of Drizzle | 14 mph E | 53% |
| Tonight | 54°F | Areas Of Drizzle | 8 to 12 mph NE | 26% |
| Saturday | 67°F | Areas Of Fog | 9 to 13 mph NE | 2% |
| Saturday Night | 52°F | Cloudy | 10 mph NE | 9% |
| Sunday | 66°F | Cloudy then Slight Chance Rain Showers | 13 mph NE | 16% |
| Sunday Night | 49°F | Chance Rain Showers | 5 to 9 mph ENE | 36% |
| Monday | 65°F | Chance Rain Showers then Mostly Cloudy | 8 mph E | 35% |
| Monday Night | 46°F | Mostly Cloudy | 7 mph ESE | 2% |
| Tuesday | 67°F | Partly Sunny | 5 to 13 mph SE | 2% |
| Tuesday Night | 49°F | Mostly Cloudy | 10 mph SSE | 13% |
| Wednesday | 70°F | Partly Sunny then Slight Chance Rain Showers | 12 to 16 mph SSE | 16% |
| Wednesday Night | 52°F | Chance Rain Showers | 8 to 13 mph SSE | 26% |
| Thursday | 72°F | Chance Rain Showers then Partly Sunny | 9 mph SSE | 26% |
| Thursday Night | 53°F | Partly Cloudy | 7 mph SSE | 11% |
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
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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 Sep 19, 2026.