Roslyn, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roslyn, a town in Day County, South Dakota.
This Afternoon
45°F
Chance Light Rain
A chance of rain. Cloudy, with a high near 45. North northwest wind around 20 mph, with gusts as high as 47 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Roslyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 45°F | Chance Light Rain | 20 mph NNW | 31% |
| Tonight | 35°F | Light Rain | 15 mph NNW | 82% |
| Wednesday | 41°F | Light Rain | 15 to 18 mph NNW | 85% |
| Wednesday Night | 31°F | Slight Chance Light Rain then Mostly Cloudy | 15 mph NNW | 21% |
| Thursday | 38°F | Partly Sunny | 9 to 14 mph N | 3% |
| Thursday Night | 28°F | Mostly Cloudy | 2 to 8 mph ENE | 0% |
| Friday | 42°F | Partly Sunny | 2 to 6 mph SSW | 0% |
| Friday Night | 31°F | Partly Cloudy | 3 to 7 mph SSW | 0% |
| Saturday | 52°F | Mostly Sunny | 7 to 13 mph WSW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 8 mph W | 3% |
| Sunday | 53°F | Sunny | 6 to 9 mph SW | 2% |
| Sunday Night | 39°F | Partly Cloudy | 9 mph SW | 0% |
| Monday | 55°F | Mostly Sunny | 9 to 15 mph WNW | 0% |
| Monday Night | 36°F | Mostly Clear | 8 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Roslyn (45.497, -97.493). Updated through the day.
Growing snapshot for Roslyn
Last spring frost
May 2
First fall frost
Oct 9
Growing season
160 days
Hardiness zone
4b
More local growing data for Roslyn: nearby ZIP 57261 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Roy Lake, Sd (11.7 mi from Roslyn). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.