Onaka, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onaka, a town in Faulk County, South Dakota.
Tonight
55°F
Areas Of Fog
Areas of fog. Cloudy, with a low around 55. Northeast wind around 10 mph.
7-day forecast for Onaka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Areas Of Fog | 10 mph NE | 6% |
| Saturday | 66°F | Areas Of Fog | 10 to 14 mph NE | 6% |
| Saturday Night | 53°F | Chance Rain Showers | 14 mph NE | 34% |
| Sunday | 62°F | Chance Rain Showers | 16 mph ENE | 43% |
| Sunday Night | 51°F | Rain Showers Likely | 9 to 14 mph E | 70% |
| Monday | 62°F | Rain Showers Likely | 12 mph E | 69% |
| Monday Night | 48°F | Mostly Cloudy | 10 mph ESE | 9% |
| Tuesday | 65°F | Partly Sunny | 9 to 18 mph SE | 6% |
| Tuesday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 17 mph SE | 19% |
| Wednesday | 70°F | Slight Chance Rain Showers | 16 to 20 mph SSE | 22% |
| Wednesday Night | 53°F | Chance Rain Showers | 12 to 17 mph SE | 31% |
| Thursday | 71°F | Chance Rain Showers then Partly Sunny | 13 mph SE | 31% |
| Thursday Night | 54°F | Partly Cloudy | 12 mph SE | 12% |
| Friday | 72°F | Partly Sunny | 9 to 17 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov) for Onaka (45.191, -99.465). Updated through the day.
Growing snapshot for Onaka
Last spring frost
May 7
First fall frost
Oct 3
Growing season
148 days
Hardiness zone
4b
More local growing data for Onaka: nearby ZIP 57466 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Roscoe, Sd (18.7 mi from Onaka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.