Custer, SD Weather & Growing Conditions
Tonight
54°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 8pm and 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then a chance of showers and thunderstorms between midnight and 3am, then showers and thunderstorms likely. Mostly cloudy, with a low around 54. North wind 1 to 7 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Chance Showers And Thunderstorms | 1 to 7 mph N | 68% |
| Saturday | 62°F | Showers And Thunderstorms Likely | 1 to 6 mph E | 68% |
| Saturday Night | 50°F | Showers And Thunderstorms Likely | 6 mph E | 74% |
| Sunday | 55°F | Showers And Thunderstorms | 6 mph E | 98% |
| Sunday Night | 47°F | Showers And Thunderstorms | 1 to 5 mph E | 89% |
| Monday | 57°F | Chance Rain Showers | 1 to 6 mph E | 53% |
| Monday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 6 mph SE | 20% |
| Tuesday | 65°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 8 mph S | 23% |
| Tuesday Night | 51°F | Chance Rain Showers then Partly Cloudy | 1 to 7 mph S | 32% |
| Wednesday | 71°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph S | 26% |
| Wednesday Night | 51°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph W | 19% |
| Thursday | 72°F | Mostly Sunny | 1 to 7 mph NE | 7% |
| Thursday Night | 51°F | Partly Cloudy | 1 to 5 mph S | 10% |
| Friday | 72°F | Mostly Sunny | 2 to 8 mph S | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Custer, SD
Last spring frost
May 23
First fall frost
Sep 24
Growing season
122 days
Hardiness zone
5a
Explore more for Custer, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Custer Co Ap, Sd (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.