Custer, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Custer, a city in Custer County, South Dakota.
This Afternoon
77°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly sunny. High near 77, with temperatures falling to around 72 in the afternoon. East wind around 5 mph, with gusts as high as 16 mph. Chance of precipitation is 20%.
7-day forecast for Custer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Slight Chance Showers And Thunderstorms | 5 mph E | 16% |
| Tonight | 52°F | Chance Showers And Thunderstorms | 3 mph NW | 69% |
| Saturday | 62°F | Patchy Fog | 1 to 5 mph E | 69% |
| Saturday Night | 49°F | Showers And Thunderstorms Likely | 6 mph E | 74% |
| Sunday | 54°F | Showers And Thunderstorms | 6 mph E | 98% |
| Sunday Night | 46°F | Showers And Thunderstorms | 1 to 5 mph E | 91% |
| Monday | 57°F | Rain Showers Likely | 1 to 7 mph E | 58% |
| Monday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph SE | 27% |
| Tuesday | 65°F | Partly Sunny then Slight Chance Rain Showers | 3 to 8 mph S | 23% |
| Tuesday Night | 50°F | Chance Rain Showers then Partly Cloudy | 2 to 7 mph S | 32% |
| Wednesday | 71°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph S | 26% |
| Wednesday Night | 50°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph W | 20% |
| Thursday | 72°F | Mostly Sunny | 2 to 7 mph NE | 7% |
| Thursday Night | 50°F | Partly Cloudy | 5 mph S | 10% |
Forecast source: National Weather Service (api.weather.gov) for Custer (43.767, -103.600). Updated through the day.
Growing snapshot for Custer
Last spring frost
May 23
First fall frost
Sep 24
Growing season
122 days
Hardiness zone
5a
More local growing data for Custer: nearby ZIP 57730 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Custer Co Ap, Sd (1.9 mi from Custer). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.