Harman US

Castlewood, SD Weather & Growing Conditions

Today
63°F
Areas Of Fog
Areas of fog and a slight chance of drizzle. Mostly cloudy, with a high near 63. Northeast wind 8 to 13 mph, with gusts as high as 22 mph.

7-day forecast

WhenTempForecastWindPrecip
Today 63°F Areas Of Fog 8 to 13 mph NE 12%
Tonight 50°F Patchy Fog then Mostly Cloudy 7 to 13 mph NNE 8%
Sunday 65°F Mostly Cloudy 12 to 15 mph NE 8%
Sunday Night 47°F Cloudy 9 to 13 mph ENE 14%
Monday 64°F Slight Chance Rain Showers 12 mph E 16%
Monday Night 43°F Partly Cloudy 5 to 8 mph E 5%
Tuesday 65°F Mostly Sunny 5 to 13 mph SE 3%
Tuesday Night 44°F Partly Cloudy 9 mph SE 2%
Wednesday 68°F Mostly Sunny 8 to 15 mph SSE 7%
Wednesday Night 49°F Chance Rain Showers 10 mph SSE 30%
Thursday 70°F Chance Rain Showers 10 to 14 mph SSE 30%
Thursday Night 52°F Mostly Cloudy then Slight Chance Rain Showers 9 mph SSE 15%
Friday 72°F Slight Chance Rain Showers then Partly Sunny 7 to 14 mph SSE 15%
Friday Night 53°F Mostly Cloudy then Slight Chance Rain Showers 12 mph SSE 19%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Castlewood, SD

Last spring frost
May 10
First fall frost
Sep 27
Growing season
139 days
Hardiness zone
4a

Explore more for Castlewood, SD: full frost dates · planting calendar · South Dakota frost dates

Climate data from the nearest NOAA station, Castlewood, Sd (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.