Harman US

Rapid City, SD Weather & Growing Conditions

Tonight
55°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 10pm and 3am, then patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 55, with temperatures rising to around 57 overnight. East wind around 5 mph. Chance of precipitation is 50%.

7-day forecast

WhenTempForecastWindPrecip
Tonight 55°F Slight Chance Showers And Thunderstorms 5 mph E 51%
Saturday 67°F Rain Showers Likely 3 to 9 mph E 58%
Saturday Night 52°F Showers And Thunderstorms Likely 6 to 9 mph E 74%
Sunday 61°F Rain Showers 6 to 10 mph E 99%
Sunday Night 49°F Showers And Thunderstorms 3 to 9 mph E 93%
Monday 64°F Chance Rain Showers 5 to 12 mph E 34%
Monday Night 48°F Mostly Cloudy 8 to 12 mph SE 13%
Tuesday 74°F Partly Sunny 9 to 20 mph S 5%
Tuesday Night 53°F Slight Chance Rain Showers then Partly Cloudy 9 to 15 mph SE 18%
Wednesday 79°F Mostly Sunny then Slight Chance Showers And Thunderstorms 9 to 13 mph S 19%
Wednesday Night 53°F Partly Cloudy 5 to 8 mph SW 14%
Thursday 80°F Sunny 3 to 9 mph NE 6%
Thursday Night 54°F Partly Cloudy 5 to 9 mph SE 6%
Friday 81°F Mostly Sunny 5 to 16 mph SE 9%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Rapid City, SD

Last spring frost
May 12
First fall frost
Oct 1
Growing season
139 days
Hardiness zone
5a

Explore more for Rapid City, SD: full frost dates · planting calendar · South Dakota frost dates

Climate data from the nearest NOAA station, Rapid City Rgnl Ap, Sd (2.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.