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
74°F
Mostly Sunny
Mostly sunny. High near 74, with temperatures falling to around 72 in the afternoon. Northeast wind around 6 mph, with gusts as high as 16 mph.
7-day forecast for St. Onge
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 6 mph NE | 5% |
| Tonight | 57°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 8 mph SE | 57% |
| Saturday | 64°F | Rain Showers Likely | 3 to 12 mph E | 74% |
| Saturday Night | 54°F | Showers And Thunderstorms Likely | 10 to 14 mph E | 74% |
| Sunday | 58°F | Rain Showers | 13 mph E | 98% |
| Sunday Night | 50°F | Showers And Thunderstorms | 6 to 15 mph E | 85% |
| Monday | 63°F | Mostly Cloudy then Chance Rain Showers | 6 to 20 mph E | 40% |
| Monday Night | 50°F | Partly Cloudy | 7 to 21 mph SE | 6% |
| Tuesday | 73°F | Mostly Sunny | 6 to 17 mph SE | 6% |
| Tuesday Night | 54°F | Mostly Clear | 3 to 17 mph SE | 8% |
| Wednesday | 76°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 8 mph SE | 21% |
| Wednesday Night | 55°F | Mostly Clear | 5 to 8 mph S | 12% |
| Thursday | 78°F | Sunny | 3 to 12 mph NE | 6% |
| Thursday Night | 55°F | Partly Cloudy | 6 to 12 mph SE | 5% |
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 Sep 18, 2026.