Hermosa, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hermosa, a town in Custer County, South Dakota.
Overnight
57°F
Patchy Fog
Patchy fog. Cloudy. Low around 57, with temperatures rising to around 61 overnight. Northeast wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Hermosa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Patchy Fog | 5 mph NE | 18% |
| Saturday | 67°F | Areas Of Fog | 5 to 9 mph E | 53% |
| Saturday Night | 49°F | Showers And Thunderstorms | 6 to 9 mph E | 76% |
| Sunday | 59°F | Showers And Thunderstorms | 7 to 12 mph E | 88% |
| Sunday Night | 46°F | Showers And Thunderstorms | 3 to 9 mph NE | 98% |
| Monday | 62°F | Chance Rain Showers | 3 to 9 mph E | 46% |
| Monday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph SE | 25% |
| Tuesday | 72°F | Mostly Sunny | 7 to 17 mph S | 8% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 8 to 14 mph S | 17% |
| Wednesday | 78°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 8 to 14 mph S | 22% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 to 8 mph S | 29% |
| Thursday | 80°F | Sunny | 2 to 8 mph S | 9% |
| Thursday Night | 53°F | Mostly Clear | 7 mph S | 8% |
| Friday | 80°F | Mostly Sunny | 6 to 15 mph S | 5% |
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.