Roslyn, SD Weather & Growing Conditions
Tonight
55°F
Areas Of Drizzle
Areas of drizzle and areas of fog before 1am, then areas of fog and patchy drizzle. Cloudy, with a low around 55. East wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Areas Of Drizzle | 7 to 10 mph E | 25% |
| Saturday | 63°F | Areas Of Fog | 8 to 12 mph NE | 4% |
| Saturday Night | 52°F | Mostly Cloudy | 10 mph NE | 11% |
| Sunday | 63°F | Cloudy | 13 mph ENE | 6% |
| Sunday Night | 49°F | Chance Rain Showers | 9 mph E | 31% |
| Monday | 61°F | Chance Rain Showers then Mostly Cloudy | 9 mph E | 31% |
| Monday Night | 47°F | Mostly Cloudy | 7 mph ESE | 4% |
| Tuesday | 64°F | Mostly Sunny | 7 to 12 mph SE | 2% |
| Tuesday Night | 49°F | Partly Cloudy | 10 mph SSE | 8% |
| Wednesday | 66°F | Partly Sunny | 10 to 14 mph SSE | 12% |
| Wednesday Night | 53°F | Chance Rain Showers | 10 mph SSE | 26% |
| Thursday | 69°F | Chance Rain Showers then Partly Sunny | 9 mph S | 26% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph SSE | 12% |
| Friday | 71°F | Partly Sunny | 8 to 13 mph SSE | 12% |
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 Sep 19, 2026.