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
49°F
Areas Of Smoke
Areas of smoke. Mostly clear, with a low around 49. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for New Underwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Areas Of Smoke | 5 to 10 mph NW | 1% |
| Tuesday | 75°F | Areas Of Smoke then Mostly Sunny | 3 to 8 mph W | 4% |
| Tuesday Night | 54°F | Partly Cloudy | 5 to 10 mph SW | 13% |
| Wednesday | 85°F | Sunny | 3 to 9 mph S | 2% |
| Wednesday Night | 57°F | Mostly Clear | 8 mph S | 2% |
| Thursday | 93°F | Sunny | 5 to 9 mph NW | 1% |
| Thursday Night | 62°F | Mostly Clear | 6 to 9 mph E | 0% |
| Friday | 97°F | Sunny | 6 to 15 mph N | 1% |
| Friday Night | 64°F | Mostly Clear | 7 to 15 mph S | 1% |
| Saturday | 99°F | Sunny | 9 to 16 mph N | 0% |
| Saturday Night | 64°F | Mostly Clear | 6 to 16 mph N | 3% |
| Sunday | 97°F | Mostly Sunny | 7 to 20 mph E | 8% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 8 to 20 mph NE | 22% |
| Monday | 93°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 8 to 18 mph NE | 15% |
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 Aug 4, 2026.