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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
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.