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

58°F

Patchy Fog

Patchy fog. Cloudy. Low around 58, with temperatures rising to around 61 overnight. East wind around 6 mph. Chance of precipitation is 20%.

7-day forecast for New Underwood

When	Temp	Forecast	Wind	Precip
Overnight	58°F	Patchy Fog	6 mph E	16%
Saturday	68°F	Areas Of Fog	6 to 12 mph E	32%
Saturday Night	50°F	Showers And Thunderstorms Likely	12 mph E	72%
Sunday	60°F	Rain Showers	10 to 14 mph E	80%
Sunday Night	47°F	Showers And Thunderstorms	7 to 12 mph E	97%
Monday	64°F	Chance Rain Showers then Mostly Cloudy	7 to 14 mph E	31%
Monday Night	46°F	Mostly Cloudy	14 mph SE	9%
Tuesday	73°F	Mostly Sunny	14 to 21 mph SE	5%
Tuesday Night	52°F	Partly Cloudy	16 to 21 mph SE	11%
Wednesday	79°F	Mostly Sunny then Slight Chance Showers And Thunderstorms	13 to 17 mph SE	18%
Wednesday Night	52°F	Chance Showers And Thunderstorms then Mostly Cloudy	5 to 12 mph S	30%
Thursday	80°F	Mostly Sunny	2 to 9 mph S	8%
Thursday Night	53°F	Mostly Clear	9 mph SE	6%
Friday	82°F	Mostly Sunny	8 to 18 mph SE	5%

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

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

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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.