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.
This Afternoon
50°F
Sunny
Sunny. High near 50, with temperatures falling to around 42 in the afternoon. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.
7-day forecast for St. Onge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 8 to 16 mph NW | 0% |
| Tonight | 31°F | Mostly Clear | 8 mph W | 0% |
| Wednesday | 51°F | Partly Sunny | 9 mph W | 0% |
| Wednesday Night | 33°F | Mostly Cloudy | 6 to 9 mph W | 0% |
| Thursday | 54°F | Sunny | 5 to 8 mph SE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 5 to 8 mph SW | 0% |
| Friday | 53°F | Mostly Sunny | 3 to 10 mph W | 1% |
| Friday Night | 37°F | Mostly Clear | 6 to 12 mph SW | 5% |
| Saturday | 57°F | Sunny | 10 to 23 mph W | 4% |
| Saturday Night | 37°F | Mostly Clear | 7 to 12 mph SW | 1% |
| Sunday | 65°F | Sunny | 8 mph SW | 0% |
| Sunday Night | 44°F | Mostly Clear | 9 to 13 mph SW | 0% |
| Monday | 58°F | Sunny | 6 to 10 mph NW | 0% |
| Monday Night | 39°F | Partly Cloudy | 7 mph SW | 1% |
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 Nov 3, 2026.