Agar, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Agar, a town in Sully County, South Dakota.
Tonight
55°F
Areas Of Fog
Areas of fog. Cloudy, with a low around 55. North northeast wind 3 to 8 mph.
7-day forecast for Agar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Areas Of Fog | 3 to 8 mph NNE | 4% |
| Saturday | 66°F | Areas Of Fog | 8 to 13 mph NE | 9% |
| Saturday Night | 52°F | Chance Rain Showers | 9 to 13 mph ENE | 43% |
| Sunday | 62°F | Rain Showers Likely | 12 to 15 mph ENE | 55% |
| Sunday Night | 50°F | Rain Showers | 9 to 14 mph ENE | 84% |
| Monday | 62°F | Rain Showers | 12 mph E | 84% |
| Monday Night | 47°F | Slight Chance Rain Showers then Mostly Cloudy | 8 to 12 mph ESE | 19% |
| Tuesday | 67°F | Mostly Cloudy | 9 to 20 mph SE | 7% |
| Tuesday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 15 to 18 mph SE | 15% |
| Wednesday | 71°F | Slight Chance Rain Showers | 20 mph SSE | 23% |
| Wednesday Night | 54°F | Chance Rain Showers | 10 to 20 mph SE | 31% |
| Thursday | 73°F | Slight Chance Rain Showers then Mostly Sunny | 12 mph SE | 21% |
| Thursday Night | 54°F | Partly Cloudy | 12 mph ESE | 10% |
| Friday | 73°F | Partly Sunny | 12 to 17 mph SE | 8% |
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 Sep 19, 2026.