Yankton, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Yankton, a city in Yankton County, South Dakota.
Today
73°F
Patchy Smoke
Patchy smoke and a slight chance of showers and thunderstorms before 8am, then patchy smoke and a chance of showers and thunderstorms between 8am and 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 73. North northwest wind 5 to 15 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Yankton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Smoke | 5 to 15 mph NNW | 49% |
| Tonight | 55°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 5 mph WNW | 17% |
| Wednesday | 79°F | Mostly Sunny | 0 to 5 mph SE | 3% |
| Wednesday Night | 56°F | Mostly Clear | 5 mph SSE | 0% |
| Thursday | 85°F | Sunny | 5 to 15 mph S | 1% |
| Thursday Night | 65°F | Mostly Clear | 5 to 10 mph S | 5% |
| Friday | 91°F | Sunny | 5 to 10 mph SSW | 5% |
| Friday Night | 67°F | Mostly Clear | 5 to 10 mph S | 11% |
| Saturday | 95°F | Sunny | 5 to 15 mph S | 4% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SSE | 15% |
| Sunday | 93°F | Mostly Sunny | 5 to 15 mph SE | 10% |
| Sunday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph ESE | 16% |
| Monday | 92°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 10 to 15 mph E | 16% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 22% |
Forecast source: National Weather Service (api.weather.gov) for Yankton (42.890, -97.393). Updated through the day.
Growing snapshot for Yankton
Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
164 days
Hardiness zone
5a
More local growing data for Yankton: nearby ZIP 57078 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Yankton 2 E, Sd (4.9 mi from Yankton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.