Farmington, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a town in Whitman County, Washington.
This Afternoon
75°F
Sunny
Sunny, with a high near 75. West wind around 3 mph.
7-day forecast for Farmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Sunny | 3 mph W | 1% |
| Tonight | 51°F | Mostly Clear | 2 mph E | 1% |
| Sunday | 81°F | Sunny | 3 mph S | 0% |
| Sunday Night | 50°F | Mostly Clear | 3 mph SE | 0% |
| Monday | 82°F | Sunny | 5 mph S | 0% |
| Monday Night | 53°F | Partly Cloudy | 3 mph S | 0% |
| Tuesday | 78°F | Mostly Sunny | 1 to 6 mph S | 1% |
| Tuesday Night | 51°F | Partly Cloudy | 5 mph SW | 2% |
| Wednesday | 71°F | Mostly Sunny | 2 to 6 mph SW | 2% |
| Wednesday Night | 47°F | Partly Cloudy | 5 mph S | 3% |
| Thursday | 71°F | Mostly Sunny | 3 mph SW | 4% |
| Thursday Night | 47°F | Partly Cloudy | 2 mph NE | 10% |
| Friday | 68°F | Partly Sunny | 5 mph SW | 14% |
| Friday Night | 45°F | Mostly Cloudy | 5 mph SW | 12% |
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 Sep 19, 2026.