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.
This Afternoon
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 72 in the afternoon. Northeast wind around 8 mph, with gusts as high as 17 mph.
7-day forecast for New Underwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 8 mph NE | 1% |
| Tonight | 56°F | Mostly Cloudy then Patchy Fog | 3 to 7 mph E | 37% |
| Saturday | 68°F | Rain Showers Likely | 3 to 10 mph E | 55% |
| Saturday Night | 53°F | Showers And Thunderstorms Likely | 10 mph E | 74% |
| Sunday | 61°F | Rain Showers | 12 mph E | 99% |
| Sunday Night | 50°F | Rain Showers | 7 to 10 mph E | 89% |
| Monday | 65°F | Chance Rain Showers | 7 to 13 mph E | 28% |
| Monday Night | 49°F | Mostly Cloudy | 14 mph SE | 8% |
| Tuesday | 74°F | Partly Sunny | 13 to 22 mph SE | 7% |
| Tuesday Night | 54°F | Slight Chance Rain Showers then Partly Cloudy | 14 to 18 mph SE | 15% |
| Wednesday | 80°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 9 to 14 mph S | 15% |
| Wednesday Night | 54°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 8 mph S | 15% |
| Thursday | 80°F | Sunny | 3 to 9 mph NE | 5% |
| Thursday Night | 55°F | Partly Cloudy | 9 mph SE | 6% |
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 Sep 19, 2026.