Fairfax, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fairfax, a town in Boyd County, South Dakota.
Today
68°F
Patchy Drizzle then Cloudy
Patchy drizzle and patchy fog before 11am. Cloudy. High near 68, with temperatures falling to around 64 in the afternoon. North wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Fairfax
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Patchy Drizzle then Cloudy | 10 mph N | 15% |
| Tonight | 55°F | Cloudy then Slight Chance Rain Showers | 10 mph NNE | 22% |
| Sunday | 61°F | Rain Showers Likely | 10 to 15 mph NE | 57% |
| Sunday Night | 52°F | Rain Showers | 5 to 10 mph ENE | 81% |
| Monday | 59°F | Rain Showers | 10 mph ENE | 81% |
| Monday Night | 47°F | Mostly Cloudy | 5 to 10 mph ESE | 8% |
| Tuesday | 64°F | Partly Sunny | 5 to 15 mph SE | 7% |
| Tuesday Night | 50°F | Mostly Cloudy | 10 to 15 mph SE | 13% |
| Wednesday | 68°F | Slight Chance Rain Showers | 15 to 20 mph SSE | 22% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 10 to 15 mph SSE | 39% |
| Thursday | 71°F | Chance Showers And Thunderstorms | 10 to 15 mph SSE | 39% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 10 mph SE | 18% |
| Friday | 72°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph SE | 18% |
| Friday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SSE | 21% |
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 Sep 19, 2026.