Fairfax, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a town in Boyd County, South Dakota.
This Afternoon
46°F
Chance Rain Showers
A chance of rain showers. Cloudy, with a high near 46. North northwest wind around 25 mph, with gusts as high as 40 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 46°F | Chance Rain Showers | 25 mph NNW | 28% |
| Tonight | 36°F | Cloudy | 15 to 20 mph NW | 12% |
| Wednesday | 45°F | Chance Rain Showers | 15 to 20 mph NW | 35% |
| Wednesday Night | 36°F | Slight Chance Rain Showers then Mostly Cloudy | 15 mph NW | 22% |
| Thursday | 48°F | Partly Sunny | 5 to 15 mph NNW | 3% |
| Thursday Night | 30°F | Partly Cloudy | 0 to 5 mph NNW | 0% |
| Friday | 49°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Friday Night | 32°F | Partly Cloudy | 5 mph SSW | 0% |
| Saturday | 59°F | Sunny | 5 to 10 mph W | 3% |
| Saturday Night | 36°F | Mostly Clear | 5 to 10 mph W | 3% |
| Sunday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Sunday Night | 41°F | Mostly Clear | 5 to 15 mph SW | 0% |
| Monday | 61°F | Sunny | 5 to 15 mph WNW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Fairfax (43.028, -98.889). Updated through the day.
Growing snapshot for Fairfax
Last spring frost
May 4
First fall frost
Oct 6
Growing season
152 days
Hardiness zone
5a
More local growing data for Fairfax: nearby ZIP 68722 weather · frost dates · planting calendar · South Dakota frost dates
Climate data from the nearest NOAA station, Butte, Ne (1.5 mi from Fairfax). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.