Eureka, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Mcpherson County, South Dakota.
Overnight
32°F
Patchy Fog
Patchy fog after 2am. Cloudy. Low around 32, with temperatures rising to around 35 overnight. North northwest wind around 18 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 32°F | Patchy Fog | 18 mph NNW | 7% |
| Wednesday | 46°F | Mostly Cloudy | 20 mph NNW | 1% |
| Wednesday Night | 30°F | Mostly Cloudy | 12 to 17 mph NNW | 0% |
| Thursday | 43°F | Mostly Sunny | 6 to 12 mph N | 0% |
| Thursday Night | 24°F | Partly Cloudy | 7 mph ESE | 0% |
| Friday | 45°F | Mostly Sunny | 5 to 9 mph S | 0% |
| Friday Night | 28°F | Partly Cloudy | 7 mph SSW | 0% |
| Saturday | 55°F | Mostly Sunny | 6 to 17 mph WSW | 0% |
| Saturday Night | 32°F | Mostly Clear | 6 to 10 mph W | 0% |
| Sunday | 56°F | Sunny | 5 to 13 mph SW | 0% |
| Sunday Night | 36°F | Partly Cloudy | 9 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 9 to 16 mph WNW | 0% |
| Monday Night | 33°F | Mostly Clear | 5 to 8 mph NW | 0% |
| Tuesday | 54°F | Mostly Sunny | 5 to 10 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (45.771, -99.621). Updated through the day.
Growing snapshot for Eureka
Last spring frost
May 12
First fall frost
Sep 27
Growing season
137 days
Hardiness zone
4b
More local growing data for Eureka: nearby ZIP 57437 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Eureka, Sd (1.6 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.