Great Diamond Island Tide Chart
Maine · NOAA Station 8417988 · 43.670°, -70.200°
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This Week’s Tides for Great Diamond Island
High and low tide times and heights (ft, MLLW) for the week ahead.
Great Diamond Island Tide Table — Next 30 Days
Every high and low tide for the next month at Great Diamond Island, with heights in feet (MLLW), the daily tidal range, and sunrise & sunset.
| Day | Sunrise | Sunset | Tides (time · ft, MLLW) | Range | |||
|---|---|---|---|---|---|---|---|
| Tide predictions are updating — check back shortly. | |||||||
About Great Diamond Island tides
Tide predictions for Great Diamond Island come from NOAA station 8417988 (Maine), computed from long-term harmonic analysis of observed water levels. Heights are shown in feet relative to MLLW (Mean Lower Low Water) — the same datum used on US nautical charts — so they line up directly with charted depths.
Great Diamond Island typically sees a mixed semidiurnal tide, with two highs and two lows of differing heights each day. Use the curve above to time a harbor entrance, a beach walk, fishing a moving tide, or clearing a shallow bar — and remember that wind and pressure can push the real water level above or below prediction. The daily tidal range in the 30-day table shows how much water moves each day: bigger ranges around the new and full moon mean stronger currents.
The current water temperature near Great Diamond Island is about 57°F, from the nearest reporting buoy (PORTLAND buoy 44007, 10 mi away). Water temperature shapes where fish hold and feed, and tells you what to wear in the water — check it alongside the tide before you head out.
Frequently asked
What time is high tide in Great Diamond Island today?+
High tide times for Great Diamond Island are published daily from NOAA tide predictions — see today's chart above.
What time is low tide in Great Diamond Island today?+
Low tide times for Great Diamond Island are shown in today's tide chart above.
What tidal datum do these Great Diamond Island tide heights use?+
All heights are given in feet relative to MLLW (Mean Lower Low Water), the standard NOAA chart datum for US tidal waters. A tide of 0.0 ft equals the chart datum; negative tides fall below it.
How accurate are these tide predictions?+
These are NOAA harmonic predictions — highly accurate for the astronomical tide. Real water levels can still differ with wind, barometric pressure, and storms, so always check current conditions before getting underway.
What is the water temperature at Great Diamond Island?+
The latest sea-surface temperature near Great Diamond Island is about 57°F, from the nearest reporting buoy (PORTLAND buoy 44007, 10 mi away). Water temperature drives fish behavior and tells you what to wear in the water, so it's worth checking alongside the tide.
Never mistime a tide again.
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