Castle Islands Tides Today
Near Petersburg · Duncan Canal · Petersburg Borough, AK · NOAA 9451321
- Low4:32AM2.0 ft
- High10:42AM16.7 ft
- Low5:13PM-0.1 ft
- High11:18PM14.9 ft
Local Alaska time. Heights in feet above average low water (MLLW). Shaded bands are today's best fishing windows.
Fishing Outlook
The low tide at 5:13 PM lands near sunset, and the tides are among the strongest this week.
Best Windows Today
- 9:42 to 11:42 AMaround high tide
- 4:13 to 6:13 PMaround low tide
Solunar Times
- Minor3:50 to 4:50 AMmoonrise
- Major8:38 to 10:38 AMmoon overhead
- Minor2:11 to 3:11 PMmoonset
- Major9:01 to 11:01 PMmoon underfoot
Major periods are the two hours around the moon overhead or underfoot. Minor periods are the hour around moonrise and moonset.
Fishing Outlook
No tide change lands near sunrise or sunset, and the tides are among the strongest this week.
Best Windows Today
- 10:20 AM to 12:20 PMaround high tide
Solunar Times
- Minor5:14 to 6:14 AMmoonrise
- Major9:23 to 11:23 AMmoon overhead
- Minor2:18 to 3:18 PMmoonset
- Major9:46 to 11:46 PMmoon underfoot
Major periods are the two hours around the moon overhead or underfoot. Minor periods are the hour around moonrise and moonset.
Fishing here? See Alaska fishing license info and sport fishing regulations from the Alaska Department of Fish and Game.
Weather and Wind
- TodayHigh 46°Light rain likely 73% rainS 5 to 10 mph
- TonightLow 37°Chance light rain 43% rainSE 5 mph
- SaturdayHigh 43°Light rain 95% rainE 5 mph
Boating Forecast
Sumner Strait · issued Fri 6:07 AM
- Today
- S wind 25 kt diminishing to 20 kt. Seas 10 ft subsiding to 6 ft in the afternoon. Near ocean entrances, seas 16 ft subsiding to 10 ft in the afternoon. Rain early in the morning.
- Tonight
- SE wind 15 kt. Seas 4 ft, except 9 ft near ocean entrances.
- Sat
- SE wind 15 kt becoming NE in the afternoon. Seas 4 ft, except 8 ft near ocean entrances. Rain in the afternoon.
From the National Weather Service. Arrows point the way the wind blows.
Next 7 Days
30 Day Tide Table| Day | Fishing | High Tides | Low Tides | Moon |
|---|---|---|---|---|
| SaturdayNov 7 | 11:20 AM 17.3 ft | 5:10 AM 2.1 ft5:48 PM -1.0 ft | ||
| SundayNov 8 | 12:01 AM 15.2 ft11:57 AM 17.7 ft | 5:44 AM 2.3 ft6:20 PM -1.5 ft | ||
| MondayNov 9 | 12:41 AM 15.4 ft12:31 PM 17.7 ft | 6:15 AM 2.6 ft6:52 PM -1.7 ft | ||
| TuesdayNov 10 | 1:19 AM 15.3 ft1:06 PM 17.4 ft | 6:46 AM 3.1 ft7:23 PM -1.4 ft | ||
| WednesdayNov 11 | 1:56 AM 14.9 ft1:39 PM 16.9 ft | 7:17 AM 3.6 ft7:56 PM -0.9 ft | ||
| ThursdayNov 12 | 2:34 AM 14.4 ft2:13 PM 16.1 ft | 7:49 AM 4.2 ft8:31 PM -0.2 ft | ||
| FridayNov 13 | 3:15 AM 13.6 ft2:49 PM 15.2 ft | 8:25 AM 4.9 ft9:10 PM 0.6 ft |
About the Tides at Castle Islands
Castle Islands gets two high tides and two low tides most days, both about the same size. On a typical day the water rises and falls about 14.6 feet.
Over the next two weeks the biggest tides come on Monday, November 9, when the water moves about 19.3 feet. The lowest water is -1.7 ft on Monday, November 9 at 6:52 PM, and the highest is 17.7 ft on Monday, November 9 at 12:31 PM. A minus tide like that uncovers the most beach, flats and tide pools.
NOAA predicts the tides here from years of measurements at station 9451321.
Official NOAA prediction for station 9451321, Castle Islands, Duncan Canal. Updated Fri, 06 Nov 2026 17:46 GMT.