St. Onge, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Onge, a community in Lawrence County, South Dakota.
Today
74°F
Areas Of Smoke then Sunny
Areas of smoke before noon. Sunny, with a high near 74. North wind around 7 mph, with gusts as high as 20 mph.
7-day forecast for St. Onge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Areas Of Smoke then Sunny | 7 mph N | 1% |
| Tonight | 53°F | Partly Cloudy then Slight Chance Rain Showers | 7 mph S | 16% |
| Wednesday | 82°F | Sunny | 1 to 6 mph E | 3% |
| Wednesday Night | 57°F | Mostly Clear | 7 mph S | 1% |
| Thursday | 90°F | Sunny | 3 to 9 mph NW | 1% |
| Thursday Night | 62°F | Mostly Clear | 6 to 9 mph SW | 0% |
| Friday | 94°F | Sunny | 5 to 13 mph N | 1% |
| Friday Night | 66°F | Mostly Clear | 7 to 15 mph S | 0% |
| Saturday | 95°F | Sunny | 5 to 16 mph N | 2% |
| Saturday Night | 64°F | Mostly Clear | 6 to 15 mph SE | 4% |
| Sunday | 94°F | Mostly Sunny | 6 to 21 mph SE | 11% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 6 to 18 mph SE | 16% |
| Monday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 21 mph E | 16% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 8 to 21 mph E | 36% |
Forecast source: National Weather Service (api.weather.gov) for St. Onge (44.546, -103.720). Updated through the day.
Growing snapshot for St. Onge
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
More local growing data for St. Onge: nearby ZIP 57779 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Belle Fourche
Boulder Canyon
Central City
Crook City
Deadwood
Lead
Mountain Plains
North Spearfish
Spearfish
Whitewood
Climate data from the nearest NOAA station, Spearfish, Sd (7.4 mi from St. Onge). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.