St. John, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. John, a town in Whitman County, Washington.
Today
54°F
Mostly Cloudy
Mostly cloudy. High near 54, with temperatures falling to around 49 in the afternoon. Northeast wind around 3 mph.
7-day forecast for St. John
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 54°F | Mostly Cloudy | 3 mph NE | 3% |
| Tonight | 35°F | Mostly Cloudy | 2 mph E | 3% |
| Wednesday | 52°F | Sunny | 2 mph S | 1% |
| Wednesday Night | 37°F | Rain Showers Likely | 3 mph SE | 64% |
| Thursday | 51°F | Rain Showers Likely then Mostly Cloudy | 3 to 9 mph SW | 64% |
| Thursday Night | 38°F | Partly Cloudy | 6 mph SE | 4% |
| Friday | 54°F | Mostly Cloudy | 8 mph S | 8% |
| Friday Night | 40°F | Mostly Cloudy | 6 mph S | 4% |
| Saturday | 62°F | Partly Sunny | 7 mph SE | 4% |
| Saturday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph SE | 21% |
| Sunday | 58°F | Slight Chance Rain Showers | 6 to 10 mph S | 23% |
| Sunday Night | 40°F | Mostly Cloudy | 6 mph S | 12% |
| Monday | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 2 to 6 mph SE | 18% |
| Monday Night | 40°F | Slight Chance Rain Showers | 5 mph S | 20% |
Forecast source: National Weather Service (api.weather.gov) for St. John (47.091, -117.589). Updated through the day.
Growing snapshot for St. John
Last spring frost
Apr 29
First fall frost
Oct 4
Growing season
161 days
Hardiness zone
6b
More local growing data for St. John: nearby ZIP 99171 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Albion
Clarkston
Clarkston Heights-Vineland
Colfax
Colton
Endicott
Farmington
Garfield
LaCrosse
Lamont
Malden
Oakesdale
Palouse
Pullman
Rosalia
Steptoe
Tekoa
Uniontown
West Clarkston-Highland
Climate data from the nearest NOAA station, St John, Wa (3.1 mi from St. John). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.