Washington State Parks · Washington
Posey Island Marine State Park
Washington State Parks · Washington, United States · in Posey Island State Park
- Sites
- 2
- Hookups
- 2 no hookups
- Restrooms
- Yes
- Pets
- Yes
- Elevation
- 0 ft
- Dark sky
- Bortle class 3
- Cell coverage
- T-Mobile good · AT&T good · Verizon good (carriers' 4G LTE filings to the FCC, 2025-12; not measured here)
- Nearest town
- Posey Island
- Address
- Posey Island Campground
- Phone
- (360) 378-2044
- Activities
- Bird Watching, Boating, Crabbing, Fishing, Hiking, Swimming, Wildlife Viewing
About
Posey Island Marine State Park is a Washington State Park with 2 campsites available for camping.
Fees
Washington State Parks' published statewide camping rate schedule varies by season: Standard sites $23-43/night, Partial-utility (water/electric) sites $35-56/night, Full-utility sites $41-56/night, Primitive sites $12/night flat year-round (peak season is May 15-Sept 15, shoulder Apr 1-May 14 & Sept 16-Oct 31, winter is Nov-Mar). Plus a $10/night extra-vehicle fee and an $8 (online) or $10 (phone) reservation fee, with an additional $15/reservation surcharge for non-residents. A Discover Pass is not required for day-use parking once a camping fee has been paid at that park. (Source: parks.wa.gov/passes-permits/fees.)
Weather, month by month
| Month | Typical high | Typical low | Coldest night | Hottest day | Years with a night below 32°F |
|---|---|---|---|---|---|
| January | 34° | 32° | 19° | 39° | 11 of 11 |
| February | 33° | 30° | 18° | 39° | 10 of 11 |
| March | 35° | 31° | 23° | 43° | 11 of 11 |
| April | 38° | 34° | 26° | 45° | 6 of 11 |
| May | 43° | 39° | 33° | 54° | 0 of 11 |
| June | 45° | 40° | 37° | 59° | 0 of 11 |
| July | 49° | 43° | 40° | 61° | 0 of 11 |
| August | 50° | 45° | 42° | 61° | 0 of 11 |
| September | 46° | 43° | 40° | 56° | 0 of 11 |
| October | 42° | 39° | 36° | 47° | 0 of 10 |
| November | 38° | 35° | 30° | 44° | 5 of 10 |
| December | 35° | 31° | 22° | 43° | 8 of 10 |
Mid-month figures from 2016–2026 of daily weather at this spot (ERA5 reanalysis via Open-Meteo, CC BY 4.0), in °F. Typical is the median; coldest and hottest are the extremes seen.
Nearby campgrounds
- San Juan County Park Campground · City, County & Regional Parks · 5 mi
- Jones Island Marine State Park · Washington State Parks · 5 mi
- Sidney Spit · Parks Canada · 7 mi · 31 sites
- San Juan County Fairgrounds RV Camping · City, County & Regional Parks · 9 mi · 8 sites
- Island View Beach Regional Park Campground · City & Municipal Parks · 10 mi · 47 sites
All public campgrounds in Washington · Every state and province · Facts read from the operator 2026-08-23. Confirm fees, rules and current status with the operator before you go.