Facility ·
Managed by the National Park Service
Fort Casey Underwater Park (Underwater Park) · Open Access
48.15686, -122.67401 · 48°9'24.7"N 122°40'26.4"W
Typically 71°F in Aug, down to 44°F in Dec.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 44 | 47 | 51 | 57 | 62 | 65 | 70 | 71 | 66 | 56 | 49 | 44 |
| Low °F | 37 | 36 | 38 | 42 | 47 | 50 | 53 | 53 | 49 | 45 | 40 | 36 |
| Precip in | 2.5 | 1.9 | 2.0 | 1.9 | 1.7 | 1.3 | 0.8 | 0.7 | 1.2 | 2.1 | 3.1 | 2.6 |
1991–2020 averages from the nearest NOAA station, 3.6 mi away — not measured at the facility itself, and elevation can make a real difference over that distance.
Recreation.gov last updated this record on 2026-02-25.
Facility information and photographs from Recreation.gov (RIDB). SpotOpened is not affiliated with Recreation.gov or any federal agency.
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