Dayton, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dayton, a city in Columbia County, Washington.
Tonight
35°F
Partly Cloudy
Partly cloudy. Low around 35, with temperatures rising to around 37 overnight. South wind 0 to 3 mph.
7-day forecast for Dayton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 35°F | Partly Cloudy | 0 to 3 mph S | 1% |
| Wednesday | 53°F | Sunny | 2 mph SW | 1% |
| Wednesday Night | 39°F | Mostly Cloudy then Chance Rain Showers | 1 to 6 mph S | 42% |
| Thursday | 53°F | Chance Rain Showers then Partly Sunny | 5 to 16 mph SW | 42% |
| Thursday Night | 39°F | Partly Cloudy | 7 mph S | 6% |
| Friday | 57°F | Mostly Cloudy | 5 mph S | 8% |
| Friday Night | 42°F | Mostly Cloudy | 2 to 7 mph S | 4% |
| Saturday | 64°F | Partly Sunny | 3 mph S | 0% |
| Saturday Night | 44°F | Mostly Cloudy then Slight Chance Rain Showers | 1 to 7 mph S | 20% |
| Sunday | 59°F | Chance Rain Showers | 5 to 13 mph SW | 35% |
| Sunday Night | 41°F | Mostly Cloudy | 1 to 6 mph S | 13% |
| Monday | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 2 mph SW | 16% |
| Monday Night | 42°F | Slight Chance Rain Showers | 0 to 3 mph S | 17% |
| Tuesday | 61°F | Chance Rain Showers | 2 mph S | 29% |
Forecast source: National Weather Service (api.weather.gov) for Dayton (46.317, -117.977). Updated through the day.
Growing snapshot for Dayton
Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
168 days
Hardiness zone
7a
More local growing data for Dayton: nearby ZIP 99328 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dayton 1 Wsw, Wa (6.8 mi from Dayton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.