Westport, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Westport, a town in Brown County, South Dakota.
Today
75°F
Sunny
Sunny, with a high near 75. West northwest wind 7 to 12 mph.
7-day forecast for Westport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 7 to 12 mph WNW | 0% |
| Tonight | 51°F | Mostly Clear | 3 to 8 mph SW | 0% |
| Wednesday | 82°F | Sunny | 5 to 9 mph SW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 6 to 10 mph SSW | 2% |
| Thursday | 86°F | Sunny | 9 to 13 mph SSW | 5% |
| Thursday Night | 59°F | Mostly Clear | 9 mph SSW | 5% |
| Friday | 87°F | Sunny | 10 mph SW | 4% |
| Friday Night | 60°F | Mostly Clear | 6 to 9 mph E | 2% |
| Saturday | 85°F | Mostly Sunny | 7 to 13 mph E | 4% |
| Saturday Night | 60°F | Mostly Clear | 9 to 13 mph NE | 10% |
| Sunday | 83°F | Mostly Sunny | 9 to 13 mph NE | 6% |
| Sunday Night | 61°F | Partly Cloudy then Chance Showers And Thunderstorms | 12 mph ENE | 25% |
| Monday | 81°F | Chance Showers And Thunderstorms then Partly Sunny | 9 to 14 mph NE | 25% |
| Monday Night | 59°F | Slight Chance Showers And Thunderstorms | 9 to 14 mph NE | 19% |
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 Corner
Claremont
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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 Aug 4, 2026.