New Underwood, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Underwood, a city in Pennington County, South Dakota.
Overnight
28°F
Mostly Clear
Mostly clear. Low around 28, with temperatures rising to around 33 overnight. Northwest wind around 9 mph, with gusts as high as 17 mph.
7-day forecast for New Underwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Mostly Clear | 9 mph NW | 0% |
| Wednesday | 54°F | Partly Sunny | 9 to 16 mph NW | 0% |
| Wednesday Night | 33°F | Partly Cloudy | 6 to 12 mph NW | 0% |
| Thursday | 55°F | Sunny | 6 mph NE | 0% |
| Thursday Night | 32°F | Partly Cloudy | 3 to 7 mph S | 0% |
| Friday | 57°F | Mostly Sunny | 2 to 13 mph NW | 0% |
| Friday Night | 35°F | Mostly Clear | 2 to 7 mph W | 0% |
| Saturday | 63°F | Sunny | 6 to 13 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 6 mph W | 0% |
| Sunday | 68°F | Sunny | 5 to 10 mph S | 0% |
| Sunday Night | 41°F | Mostly Clear | 9 mph W | 0% |
| Monday | 62°F | Sunny | 5 to 9 mph NW | 0% |
| Monday Night | 37°F | Partly Cloudy | 6 mph W | 0% |
| Tuesday | 63°F | Mostly Sunny | 7 mph SE | 0% |
Forecast source: National Weather Service (api.weather.gov) for New Underwood (44.098, -102.847). Updated through the day.
Growing snapshot for New Underwood
Last spring frost
May 12
First fall frost
Oct 1
Growing season
139 days
Hardiness zone
5a
More local growing data for New Underwood: nearby ZIP 57725 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Caputa
Colonial Pine Hills
Cottonwood
Green Valley
Hill City
Johnson Siding
Keystone
Quinn
Rapid City
Wall
Climate data from the nearest NOAA station, Rapid City Rgnl Ap, Sd (15.1 mi from New Underwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.