Eureka, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Mcpherson County, South Dakota.
Overnight
46°F
Patchy Smoke
Patchy smoke before 5am. Mostly clear, with a low around 46. West wind around 6 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Patchy Smoke | 6 mph W | 0% |
| Tuesday | 75°F | Patchy Smoke then Sunny | 6 to 15 mph WNW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 5 to 13 mph SSW | 0% |
| Wednesday | 83°F | Sunny | 5 to 14 mph WSW | 0% |
| Wednesday Night | 58°F | Partly Cloudy | 8 to 13 mph SSW | 1% |
| Thursday | 88°F | Sunny | 9 to 14 mph WSW | 1% |
| Thursday Night | 60°F | Mostly Clear | 7 to 13 mph ENE | 1% |
| Friday | 89°F | Sunny | 8 to 16 mph NNW | 1% |
| Friday Night | 60°F | Mostly Clear | 12 to 15 mph E | 2% |
| Saturday | 90°F | Mostly Sunny | 15 to 18 mph E | 2% |
| Saturday Night | 60°F | Mostly Clear | 15 to 18 mph E | 7% |
| Sunday | 86°F | Mostly Sunny | 15 to 20 mph ENE | 6% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 18 mph E | 30% |
| Monday | 85°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 21 mph ENE | 30% |
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 Aug 4, 2026.