Agar, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Agar, a town in Sully County, South Dakota.
Tonight
33°F
Patchy Fog
Patchy fog between 11pm and 5am. Cloudy, with a low around 33. North northwest wind 12 to 16 mph, with gusts as high as 29 mph.
7-day forecast for Agar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 33°F | Patchy Fog | 12 to 16 mph NNW | 6% |
| Wednesday | 47°F | Mostly Cloudy | 14 to 20 mph NNW | 3% |
| Wednesday Night | 31°F | Mostly Cloudy | 12 to 16 mph NNW | 1% |
| Thursday | 48°F | Patchy Fog then Mostly Sunny | 7 to 12 mph N | 0% |
| Thursday Night | 25°F | Partly Cloudy | 6 mph E | 0% |
| Friday | 48°F | Mostly Sunny | 5 to 8 mph S | 0% |
| Friday Night | 28°F | Mostly Clear | 6 mph SW | 0% |
| Saturday | 58°F | Mostly Sunny | 5 to 15 mph W | 4% |
| Saturday Night | 31°F | Mostly Clear | 5 to 10 mph W | 1% |
| Sunday | 59°F | Sunny | 5 to 10 mph S | 0% |
| Sunday Night | 36°F | Mostly Clear | 10 mph SW | 0% |
| Monday | 59°F | Sunny | 10 to 16 mph NW | 0% |
| Monday Night | 33°F | Partly Cloudy | 5 to 8 mph NW | 1% |
| Tuesday | 57°F | Mostly Sunny | 6 to 10 mph SE | 0% |
Forecast source: National Weather Service (api.weather.gov) for Agar (44.840, -100.073). Updated through the day.
Growing snapshot for Agar
Last spring frost
May 8
First fall frost
Oct 2
Growing season
147 days
Hardiness zone
4b
More local growing data for Agar: nearby ZIP 57564 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Onida 4 Nw, Sd (6.4 mi from Agar). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.