Alcester, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alcester, a city in Union County, South Dakota.
Today
71°F
Patchy Smoke
Patchy smoke and a chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 71. North northwest wind 5 to 15 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Alcester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Patchy Smoke | 5 to 15 mph NNW | 52% |
| Tonight | 54°F | Chance Rain Showers then Mostly Cloudy | 0 to 5 mph NW | 28% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph SE | 1% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 81°F | Mostly Sunny | 5 to 15 mph S | 0% |
| Thursday Night | 63°F | Mostly Clear | 5 to 10 mph S | 2% |
| Friday | 86°F | Sunny | 5 to 15 mph SSW | 4% |
| Friday Night | 65°F | Mostly Clear | 5 to 10 mph S | 12% |
| Saturday | 89°F | Sunny | 5 to 15 mph SSE | 5% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SE | 16% |
| Sunday | 88°F | Mostly Sunny | 10 to 15 mph SE | 12% |
| Sunday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph ESE | 16% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph E | 16% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 20% |
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 Aug 4, 2026.