Dayton, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dayton, a city in Columbia County, Washington.
Today
79°F
Sunny
Sunny. High near 79, with temperatures falling to around 77 in the afternoon. West wind around 3 mph.
7-day forecast for Dayton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 3 mph W | 0% |
| Tonight | 52°F | Mostly Clear | 2 mph E | 0% |
| Sunday | 83°F | Sunny | 2 mph W | 0% |
| Sunday Night | 54°F | Clear | 3 mph SE | 0% |
| Monday | 84°F | Sunny | 3 mph SW | 0% |
| Monday Night | 54°F | Mostly Clear | 2 mph S | 0% |
| Tuesday | 81°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 53°F | Mostly Clear | 3 mph SW | 1% |
| Wednesday | 77°F | Mostly Sunny | 2 to 6 mph SW | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 1 to 5 mph S | 2% |
| Thursday | 76°F | Mostly Sunny | 3 mph W | 2% |
| Thursday Night | 51°F | Partly Cloudy | 2 mph S | 4% |
| Friday | 72°F | Mostly Sunny then Slight Chance Rain Showers | 0 to 5 mph SW | 15% |
| Friday Night | 48°F | Slight Chance Rain Showers then Partly Cloudy | 1 to 5 mph SW | 15% |
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 Sep 19, 2026.