Eureka, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Mcpherson County, South Dakota.
Tonight
55°F
Cloudy then Chance Rain Showers
A chance of rain showers after 1am. Cloudy, with a low around 55. East northeast wind 7 to 15 mph. Chance of precipitation is 40%.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Cloudy then Chance Rain Showers | 7 to 15 mph ENE | 41% |
| Sunday | 61°F | Chance Rain Showers | 17 mph ENE | 41% |
| Sunday Night | 48°F | Chance Rain Showers | 8 to 14 mph ENE | 42% |
| Monday | 63°F | Partly Sunny | 12 mph E | 7% |
| Monday Night | 43°F | Partly Cloudy | 10 mph SE | 2% |
| Tuesday | 64°F | Mostly Sunny | 9 to 21 mph SE | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 22 mph SE | 4% |
| Wednesday | 67°F | Partly Sunny then Slight Chance Rain Showers | 22 to 25 mph SE | 16% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 16 to 24 mph SE | 62% |
| Thursday | 72°F | Chance Showers And Thunderstorms | 10 to 15 mph SE | 46% |
| Thursday Night | 53°F | Partly Cloudy | 9 mph SE | 8% |
| Friday | 73°F | Partly Sunny | 9 to 20 mph SE | 6% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 18 to 22 mph SE | 19% |
| Saturday | 73°F | Chance Rain Showers | 22 mph SSE | 33% |
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 Sep 20, 2026.