Roslyn, SD Weather & Growing Conditions
Today
70°F
Sunny
Sunny, with a high near 70. West northwest wind 7 to 12 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Sunny | 7 to 12 mph WNW | 0% |
| Tonight | 54°F | Mostly Clear | 3 to 9 mph SSW | 0% |
| Wednesday | 77°F | Sunny | 7 to 12 mph SW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 7 to 14 mph SSW | 1% |
| Thursday | 81°F | Sunny | 12 to 15 mph SSW | 5% |
| Thursday Night | 63°F | Mostly Clear | 10 mph SSW | 6% |
| Friday | 83°F | Sunny | 12 mph SW | 6% |
| Friday Night | 62°F | Mostly Clear | 6 to 9 mph E | 6% |
| Saturday | 81°F | Sunny | 7 to 14 mph ESE | 9% |
| Saturday Night | 61°F | Slight Chance Showers And Thunderstorms | 12 mph E | 18% |
| Sunday | 80°F | Slight Chance Rain Showers then Mostly Sunny | 12 mph ENE | 15% |
| Sunday Night | 63°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph E | 28% |
| Monday | 77°F | Chance Showers And Thunderstorms then Partly Sunny | 13 mph ENE | 28% |
| Monday Night | 61°F | Slight Chance Showers And Thunderstorms | 12 mph NE | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Roslyn, SD
Last spring frost
May 2
First fall frost
Oct 9
Growing season
160 days
Hardiness zone
4b
Explore more for Roslyn, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Roy Lake, Sd (11.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.