Farmington, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Farmington, a town in Whitman County, Washington.
Overnight
35°F
Partly Cloudy
Partly cloudy, with a low around 35. Wind around 0 mph.
7-day forecast for Farmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 35°F | Partly Cloudy | 0 mph | 2% |
| Wednesday | 51°F | Sunny | 2 mph SW | 2% |
| Wednesday Night | 37°F | Rain Showers | 0 to 5 mph SE | 82% |
| Thursday | 48°F | Rain Showers | 3 to 8 mph SW | 82% |
| Thursday Night | 36°F | Partly Cloudy | 6 mph SE | 1% |
| Friday | 52°F | Partly Sunny | 5 to 8 mph SE | 4% |
| Friday Night | 41°F | Mostly Cloudy | 6 mph SE | 9% |
| Saturday | 61°F | Partly Sunny | 6 mph SE | 3% |
| Saturday Night | 44°F | Mostly Cloudy then Slight Chance Rain Showers | 3 to 8 mph SE | 19% |
| Sunday | 55°F | Slight Chance Rain Showers | 5 to 9 mph SW | 19% |
| Sunday Night | 39°F | Mostly Cloudy | 5 mph S | 6% |
| Monday | 56°F | Partly Sunny then Slight Chance Rain Showers | 1 to 5 mph E | 15% |
| Monday Night | 40°F | Slight Chance Rain Showers | 3 mph SE | 18% |
| Tuesday | 55°F | Slight Chance Rain Showers | 2 to 6 mph S | 19% |
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 Nov 4, 2026.