Farmington, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a town in Whitman County, Washington.
Today
82°F
Areas Of Smoke
Areas of smoke before 1pm. Sunny, with a high near 82. North wind around 5 mph.
7-day forecast for Farmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Areas Of Smoke | 5 mph N | 0% |
| Tonight | 49°F | Patchy Smoke then Haze | 3 mph NE | 0% |
| Wednesday | 88°F | Sunny then Patchy Smoke | 2 mph S | 0% |
| Wednesday Night | 52°F | Patchy Smoke then Clear | 2 mph NE | 0% |
| Thursday | 93°F | Sunny | 5 mph S | 0% |
| Thursday Night | 55°F | Mostly Clear | 3 mph S | 0% |
| Friday | 91°F | Sunny | 3 to 10 mph SW | 0% |
| Friday Night | 55°F | Mostly Clear | 5 to 9 mph SW | 0% |
| Saturday | 88°F | Sunny | 5 to 9 mph SW | 0% |
| Saturday Night | 54°F | Mostly Clear | 3 to 9 mph SW | 0% |
| Sunday | 83°F | Sunny | 5 to 8 mph SW | 0% |
| Sunday Night | 51°F | Mostly Clear | 2 to 7 mph S | 0% |
| Monday | 83°F | Sunny | 6 mph SW | 0% |
| Monday Night | 51°F | Mostly Clear | 2 to 6 mph S | 0% |
Forecast source: National Weather Service (api.weather.gov) for Farmington (47.089, -117.046). Updated through the day.
Growing snapshot for Farmington
Last spring frost
May 15
First fall frost
Sep 21
Growing season
126 days
Hardiness zone
6b
More local growing data for Farmington: nearby ZIP 99128 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Potlatch 3 Nne, Id (14.3 mi from Farmington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.