Portland Harbor Entrance — ME, United States

Tidal currents & slack water

↑0.4 kn↑0.7 kn↑0.5 kn↑0.9 kn06:3213:2018:11Now
Tidal current at Portland Harbor Entrance, computed from harmonic constituents. Maximum ebb of 0.9 knots on Mon 19 Oct 2026 at 22:06.
↑7:00am↓5:50pm

Predictions are not observations — conditions vary with weather and river flow. Not for navigation.

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Slack water and maximums for the next 7 days

Mon 19 Oct 2026 through Sun 25 Oct 2026. All times are local to Portland Harbor Entrance (America/New_York). What slack water is, and why it isn’t high or low tide.
DayCurrentTimeSpeed
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max flood0.4 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max ebb0.7 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max flood0.5 kn
Mon 19 Oct 2026Slack
Mon 19 Oct 2026Max ebb0.9 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max flood0.5 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max ebb0.7 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max flood0.5 kn
Tue 20 Oct 2026Slack
Tue 20 Oct 2026Max ebb0.9 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max flood0.5 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max ebb0.8 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max flood0.5 kn
Wed 21 Oct 2026Slack
Wed 21 Oct 2026Max ebb1.0 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max flood0.6 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max ebb0.9 kn
Thu 22 Oct 2026Slack
Thu 22 Oct 2026Max flood0.6 kn
Thu 22 Oct 2026Slack
Fri 23 Oct 2026Max ebb1.0 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max flood0.7 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max ebb1.1 kn
Fri 23 Oct 2026Slack
Fri 23 Oct 2026Max flood0.7 kn
Fri 23 Oct 2026Slack
Sat 24 Oct 2026Max ebb1.1 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max flood0.7 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max ebb1.2 kn
Sat 24 Oct 2026Slack
Sat 24 Oct 2026Max flood0.8 kn
Sat 24 Oct 2026Slack
Sun 25 Oct 2026Max ebb1.1 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max flood0.8 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max ebb1.3 kn
Sun 25 Oct 2026Slack
Sun 25 Oct 2026Max flood0.9 kn
Sun 25 Oct 2026Slack

Station facts

Position
43.6280° N, 70.2095° W
Time zone
America/New_York
Source
NOAA harmonic constituents
Region
ME, United States

How we check predictions — dated samples and their limits.

Nearby

All current stations