Isabel, SD Weather & Growing Conditions
Tonight
30°F
Mostly Cloudy
Mostly cloudy, with a low around 30. Northwest wind around 12 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Mostly Cloudy | 12 mph NW | 0% |
| Wednesday | 50°F | Partly Sunny | 13 to 16 mph NW | 0% |
| Wednesday Night | 30°F | Mostly Cloudy | 10 to 14 mph NW | 0% |
| Thursday | 48°F | Mostly Sunny | 5 to 9 mph NE | 0% |
| Thursday Night | 27°F | Partly Cloudy | 7 mph SE | 0% |
| Friday | 50°F | Mostly Sunny | 7 mph SW | 0% |
| Friday Night | 32°F | Mostly Clear | 6 to 10 mph SW | 2% |
| Saturday | 57°F | Sunny | 10 to 21 mph W | 2% |
| Saturday Night | 32°F | Mostly Clear | 7 to 10 mph W | 0% |
| Sunday | 60°F | Sunny | 7 to 12 mph S | 0% |
| Sunday Night | 39°F | Mostly Clear | 9 to 15 mph SW | 0% |
| Monday | 58°F | Sunny | 7 to 20 mph NW | 0% |
| Monday Night | 34°F | Partly Cloudy | 7 mph W | 1% |
| Tuesday | 56°F | Mostly Sunny | 7 to 12 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Isabel, SD
Last spring frost
May 11
First fall frost
Sep 30
Growing season
140 days
Hardiness zone
4b
Explore more for Isabel, SD: full frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Glad Valley 2 W, Sd (13.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.