Alcester, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alcester, a city in Union County, South Dakota.
Tonight
39°F
Rain Showers
Rain showers. Cloudy. Low around 39, with temperatures rising to around 42 overnight. Northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Alcester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 39°F | Rain Showers | 15 to 20 mph NW | 95% |
| Wednesday | 46°F | Rain Showers Likely | 15 to 20 mph NW | 62% |
| Wednesday Night | 37°F | Rain Showers Likely | 15 mph NW | 55% |
| Thursday | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NNW | 16% |
| Thursday Night | 32°F | Mostly Cloudy | 5 to 10 mph N | 0% |
| Friday | 48°F | Partly Sunny | 0 to 5 mph ESE | 0% |
| Friday Night | 31°F | Mostly Cloudy | 0 to 5 mph S | 1% |
| Saturday | 56°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WNW | 5% |
| Sunday | 59°F | Sunny | 5 mph WSW | 2% |
| Sunday Night | 38°F | Mostly Clear | 5 mph S | 0% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph NW | 0% |
| Tuesday | 59°F | Mostly Sunny | 5 mph SW | 1% |
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 Nov 4, 2026.