Alaska
Udamat Bay
Sedanka Island · Alaska · NOAA station 9462645 · Tide predictions
53.8289, -166.2163
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48-hour outlook
Drag across the curve to inspect any time. Weather icons show the forecast at each high tide.
Drawn from the high/low predictions — NOAA publishes high/low only for this station.
The next seven days
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H = high tide · L = low tide · highs & lows in local time
On the water nearby
Last light, longer plans
Daylight calendar for Unalaska / Dutch Harbor → Alaska Daylight · Northern lights forecast for Unalaska / Dutch Harbor → Alaska Aurora Forecast
Nearby tide stations
- English Bay · 6.8 mi N
- Udagak Strait · 7.1 mi SW
- Unalaska · 13.7 mi W
- Dutch Harbor, Amaknak Island · 13.8 mi W
- Kisselen Bay, Beaver Inlet · 16.6 mi SW
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 6.2 ft — Thu Jan 21 · 1:12 PM
Lowest predicted low tide: -1.9 ft — Sun Jul 4 · 10:12 AM
Biggest single-day swing: 8.0 ft on Sun Jul 4
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sun Jul 4 | 10:12 AM | -1.9 ft |
| Sat Jun 5 | 10:24 AM | -1.8 ft |
| Sat Jul 3 | 9:24 AM | -1.8 ft |
| Sun Jun 6 | 11:12 AM | -1.8 ft |
| Mon Jul 5 | 10:54 AM | -1.7 ft |
| Fri Jun 4 | 9:36 AM | -1.6 ft |
| Sun Aug 1 | 9:12 AM | -1.5 ft |
| Mon Jun 7 | 12:00 PM | -1.5 ft |
| Fri Jul 2 | 8:36 AM | -1.5 ft |
| Mon Aug 2 | 9:54 AM | -1.5 ft |
168 minus tides (below 0 ft) are predicted here in 2027. The table shows up to the 10 lowest that fall between 7 AM and 7 PM — the ones worth planning a clam dig or tidepool walk around.
About this station
Udamat Bay, Sedanka Island is one of NOAA's reference tide stations — its predictions are computed directly from harmonic analysis of water levels observed here, and other nearby stations are calculated from it.
Alaska holds the country's most extreme tides: Inside Passage channels, Cook Inlet swings past 30 ft, and Arctic stations where the tide is measured in inches and wind setup runs the show.