Hosmer, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hosmer, a city in Mcpherson County, South Dakota.
Today
66°F
Slight Chance Drizzle then Cloudy
A slight chance of drizzle before noon. Cloudy, with a high near 66. Northeast wind around 14 mph.
7-day forecast for Hosmer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Slight Chance Drizzle then Cloudy | 14 mph NE | 9% |
| Tonight | 56°F | Cloudy then Slight Chance Rain Showers | 9 to 14 mph ENE | 24% |
| Sunday | 59°F | Chance Rain Showers | 16 mph ENE | 39% |
| Sunday Night | 48°F | Chance Rain Showers | 8 to 14 mph ENE | 40% |
| Monday | 62°F | Partly Sunny | 12 mph E | 12% |
| Monday Night | 43°F | Partly Cloudy | 10 mph SE | 4% |
| Tuesday | 64°F | Mostly Sunny | 8 to 20 mph SE | 1% |
| Tuesday Night | 48°F | Mostly Cloudy | 20 mph SE | 5% |
| Wednesday | 66°F | Partly Sunny then Slight Chance Rain Showers | 21 to 24 mph SE | 16% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 16 to 23 mph SE | 56% |
| Thursday | 72°F | Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph SE | 37% |
| Thursday Night | 53°F | Mostly Cloudy | 10 mph SE | 11% |
| Friday | 73°F | Partly Sunny | 8 to 18 mph SE | 8% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 20 mph SE | 21% |
Forecast source: National Weather Service (api.weather.gov) for Hosmer (45.579, -99.474). Updated through the day.
Growing snapshot for Hosmer
Last spring frost
May 7
First fall frost
Oct 3
Growing season
148 days
Hardiness zone
4b
More local growing data for Hosmer: nearby ZIP 57448 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Roscoe, Sd (12 mi from Hosmer). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.