Oak Harbor, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oak Harbor, a city in Island County, Washington.
Tonight
51°F
Mostly Cloudy
Mostly cloudy, with a low around 51. Southwest wind around 1 mph.
7-day forecast for Oak Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Cloudy | 1 mph SW | 1% |
| Saturday | 68°F | Partly Sunny | 1 to 5 mph SW | 1% |
| Saturday Night | 50°F | Partly Cloudy | 1 to 5 mph W | 0% |
| Sunday | 67°F | Mostly Sunny | 1 to 7 mph W | 0% |
| Sunday Night | 51°F | Partly Cloudy | 2 to 6 mph W | 0% |
| Monday | 69°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Monday Night | 51°F | Partly Cloudy | 2 to 6 mph W | 1% |
| Tuesday | 66°F | Partly Sunny | 2 to 6 mph WSW | 4% |
| Tuesday Night | 51°F | Mostly Cloudy | 1 to 6 mph WSW | 5% |
| Wednesday | 66°F | Partly Sunny | 1 to 5 mph SW | 5% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 5 mph NW | 11% |
| Thursday | 67°F | Partly Sunny then Slight Chance Light Rain | 1 to 6 mph W | 16% |
| Thursday Night | 51°F | Chance Light Rain | 2 to 6 mph WSW | 34% |
| Friday | 66°F | Chance Light Rain | 3 to 7 mph SW | 34% |
Forecast source: National Weather Service (api.weather.gov) for Oak Harbor (48.294, -122.628). Updated through the day.
Growing snapshot for Oak Harbor
Last spring frost
Mar 13
First fall frost
Nov 14
Growing season
244 days
Hardiness zone
8b
More local growing data for Oak Harbor: nearby ZIP 98277 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Whidbey Island Nas, Wa (2.7 mi from Oak Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.