Harman US

Hermosa, SD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Hermosa, a town in Custer County, South Dakota.

Tonight
56°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3am, then showers and thunderstorms likely between 3am and 4am, then patchy fog and showers and thunderstorms likely. Cloudy. Low around 56, with temperatures rising to around 58 overnight. East wind around 3 mph. Chance of precipitation is 60%.

7-day forecast for Hermosa

WhenTempForecastWindPrecip
Tonight 56°F Chance Showers And Thunderstorms 3 mph E 62%
Saturday 67°F Patchy Fog 2 to 8 mph E 61%
Saturday Night 53°F Showers And Thunderstorms Likely 5 to 8 mph E 74%
Sunday 60°F Rain Showers 5 to 8 mph E 99%
Sunday Night 50°F Showers And Thunderstorms 3 to 9 mph E 95%
Monday 63°F Chance Rain Showers 3 to 9 mph E 44%
Monday Night 50°F Slight Chance Rain Showers then Mostly Cloudy 6 to 9 mph SE 20%
Tuesday 73°F Partly Sunny 7 to 16 mph S 8%
Tuesday Night 54°F Chance Rain Showers then Partly Cloudy 7 to 13 mph S 26%
Wednesday 78°F Mostly Sunny then Slight Chance Showers And Thunderstorms 7 to 12 mph S 20%
Wednesday Night 54°F Slight Chance Showers And Thunderstorms then Partly Cloudy 7 mph SW 19%
Thursday 79°F Sunny 3 to 8 mph NE 7%
Thursday Night 55°F Partly Cloudy 7 mph S 8%
Friday 80°F Mostly Sunny 5 to 15 mph S 10%

Forecast source: National Weather Service (api.weather.gov) for Hermosa (43.840, -103.191). Updated through the day.

Growing snapshot for Hermosa

Last spring frost
May 12
First fall frost
Oct 1
Growing season
139 days
Hardiness zone
5a

More local growing data for Hermosa: nearby ZIP 57744 weather · frost dates · planting calendar · South Dakota frost dates

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Climate data from the nearest NOAA station, Rapid City Rgnl Ap, Sd (17.3 mi from Hermosa). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.