Alcester, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alcester, a city in Union County, South Dakota.
Tonight
63°F
Slight Chance Showers And Thunderstorms then Patchy Fog
A slight chance of showers and thunderstorms before 9pm, then patchy fog and a slight chance of showers and thunderstorms between 1am and 2am, then patchy fog and a chance of showers and thunderstorms between 2am and 4am, then patchy fog and a slight chance of showers and thunderstorms between 4am and 5am, then patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 63, with temperatures rising to around 66 overnight. North wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Alcester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Slight Chance Showers And Thunderstorms then Patchy Fog | 5 to 10 mph N | 33% |
| Saturday | 70°F | Patchy Fog then Cloudy | 5 to 10 mph N | 18% |
| Saturday Night | 57°F | Mostly Cloudy | 10 mph NNE | 8% |
| Sunday | 65°F | Mostly Cloudy then Chance Rain Showers | 10 to 15 mph NE | 38% |
| Sunday Night | 54°F | Rain Showers Likely | 10 mph ENE | 71% |
| Monday | 59°F | Rain Showers Likely | 10 mph ENE | 71% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph ENE | 37% |
| Tuesday | 63°F | Partly Sunny | 5 to 10 mph E | 4% |
| Tuesday Night | 48°F | Partly Cloudy | 5 mph SE | 0% |
| Wednesday | 67°F | Partly Sunny | 5 to 10 mph SE | 11% |
| Wednesday Night | 53°F | Mostly Cloudy then Chance Rain Showers | 5 mph SE | 39% |
| Thursday | 67°F | Chance Rain Showers | 5 to 10 mph SSE | 39% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 21% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph SE | 21% |
Forecast source: National Weather Service (api.weather.gov) for Alcester (43.028, -96.627). Updated through the day.
Growing snapshot for Alcester
Last spring frost
May 1
First fall frost
Oct 4
Growing season
155 days
Hardiness zone
5a
More local growing data for Alcester: nearby ZIP 57001 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hawarden, Ia (8.7 mi from Alcester). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.