Agar, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Agar, a town in Sully County, South Dakota.
Today
73°F
Patchy Smoke then Sunny
Patchy smoke before 10am. Sunny, with a high near 73. West northwest wind 9 to 13 mph, with gusts as high as 21 mph.
7-day forecast for Agar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Smoke then Sunny | 9 to 13 mph WNW | 0% |
| Tonight | 54°F | Mostly Clear | 6 to 9 mph SW | 0% |
| Wednesday | 82°F | Mostly Sunny | 6 to 12 mph SW | 0% |
| Wednesday Night | 59°F | Partly Cloudy | 8 to 12 mph S | 3% |
| Thursday | 88°F | Sunny | 10 mph SSW | 3% |
| Thursday Night | 61°F | Mostly Clear | 9 mph SW | 3% |
| Friday | 91°F | Sunny | 7 to 12 mph NW | 1% |
| Friday Night | 63°F | Mostly Clear | 12 mph E | 1% |
| Saturday | 92°F | Mostly Sunny | 12 to 17 mph ESE | 3% |
| Saturday Night | 62°F | Mostly Clear | 10 to 14 mph ENE | 4% |
| Sunday | 89°F | Mostly Sunny | 10 to 17 mph ENE | 4% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms | 13 to 17 mph E | 35% |
| Monday | 87°F | Chance Showers And Thunderstorms then Partly Sunny | 14 to 17 mph ENE | 35% |
| Monday Night | 62°F | Slight Chance Showers And Thunderstorms | 13 to 17 mph ENE | 24% |
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 Aug 4, 2026.