Shemya king tides 2026–27
The highest tides NOAA predicts for Shemya over the next 12 months, one per spring tide, at Alcan Harbor, Shemya Island. The biggest is 5.1 ft on Wed, Dec 23, 2026 at 2:00 PM, about 1.9 ft above a typical high tide.
Next big tide: Wed, Nov 25, 2026 at 3:17 PM, 4.6 ft.
Highest tides
| Date | Time | Height | Above a typical high | Moon |
|---|---|---|---|---|
| Wed, Nov 25, 2026 | 3:17 PM | 4.6 ft | 1.4 ft | 1 day after the full moon |
| Sat, Dec 5, 2026 | 1:24 PM | 4.3 ft | 1.1 ft | 3 days before the new moon |
| Wed, Dec 23, 2026 | 2:00 PM | 5.1 ft | 1.9 ft | on the full moon |
| Fri, Jan 1, 2027 | 11:40 AM | 4.6 ft | 1.4 ft | |
| Wed, Jan 6, 2027 | 1:47 PM | 4.2 ft | 1.0 ft | 1 day before the new moon |
| Wed, Jan 20, 2027 | 12:54 PM | 5.0 ft | 1.8 ft | 2 days before the full moon |
| Sat, Jan 30, 2027 | 10:52 AM | 4.3 ft | 1.1 ft | |
| Tue, Feb 16, 2027 | 10:54 AM | 4.4 ft | 1.2 ft | |
| Sat, Jul 3, 2027 | 1:37 AM | 4.4 ft | 1.2 ft | 1 day before the new moon |
| Sat, Jul 31, 2027 | 12:30 AM | 4.3 ft | 1.1 ft | 2 days before the new moon |
These are astronomical predictions. An onshore wind, heavy rain or a storm can push water a foot or more higher, and that is when king tides flood low roads, docks and marsh-front yards. Check the forecast the week before.
Lowest tides
The same spring tides drain the water lowest. Good days for shelling, walking sandbars and exploring the flats; mind the time and the incoming tide.
| Date | Time | Height | Below a typical low | Moon |
|---|---|---|---|---|
| Fri, Oct 30, 2026 | 1:29 AM | −1.3 ft | 2.0 ft | |
| Wed, Nov 25, 2026 | 11:35 PM | −1.3 ft | 2.0 ft | 2 days after the full moon |
| Sun, Apr 11, 2027 | 2:17 PM | −1.3 ft | 2.0 ft | |
| Sun, May 9, 2027 | 1:06 PM | −1.6 ft | 2.3 ft | 4 days after the new moon |
| Sun, Jun 6, 2027 | 12:01 PM | −1.6 ft | 2.3 ft | 2 days after the new moon |
| Sun, Jul 4, 2027 | 10:57 AM | −1.4 ft | 2.1 ft | 1 day after the new moon |
What is a king tide?
“King tide” is the everyday name for the highest tides of the year. They come with the new or full moon (spring tides) when the moon is also at its closest to Earth, and they are strongest in the months when the sun lines up too. They are entirely predictable, which is why the dates above are known a year ahead.
King tides in nearby towns
- Attu · 48 mi
From NOAA tide predictions for Alcan Harbor, Shemya Island. Heights are feet above mean lower low water (MLLW). Not for navigation.