Seneca, SD Weather & Growing Conditions
Tonight
34°F
Patchy Fog
Patchy fog after 11pm. Cloudy, with a low around 34. North northwest wind around 17 mph, with gusts as high as 28 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Patchy Fog | 17 mph NNW | 8% |
| Wednesday | 45°F | Patchy Fog then Mostly Cloudy | 20 mph NNW | 14% |
| Wednesday Night | 30°F | Mostly Cloudy | 13 to 17 mph NNW | 4% |
| Thursday | 45°F | Patchy Fog then Mostly Sunny | 8 to 13 mph N | 0% |
| Thursday Night | 25°F | Partly Cloudy | 7 mph ESE | 0% |
| Friday | 45°F | Mostly Sunny | 5 to 8 mph S | 0% |
| Friday Night | 28°F | Partly Cloudy | 6 to 9 mph SW | 0% |
| Saturday | 56°F | Mostly Sunny | 9 to 15 mph W | 4% |
| Saturday Night | 32°F | Mostly Clear | 12 mph W | 1% |
| Sunday | 57°F | Sunny | 12 mph SSW | 0% |
| Sunday Night | 37°F | Mostly Clear | 10 to 14 mph SW | 0% |
| Monday | 58°F | Sunny | 12 to 17 mph NW | 0% |
| Monday Night | 34°F | Partly Cloudy | 9 mph WNW | 0% |
| Tuesday | 54°F | Mostly Sunny | 7 to 10 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Seneca, SD
Last spring frost
May 14
First fall frost
Sep 29
Growing season
138 days
Hardiness zone
4b
Explore more for Seneca, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Highmore 23 N, Sd (10.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.