Tides Today & Tomorrow in Portland, ME

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently falling in Portland, ME.
Next low tide (tomorrow) : in 5h 35m at 12:03 am (0.9 ft)
Next high tide (tomorrow) : 6:13 am (8.4 ft)
Sunset today : 8:15 pm
Sunrise tomorrow : 5:19 am
Moon phase : First Quarter (52% illuminated)
Tide Station Location : Station #8418150
Common Questions About Tides

Portland, ME Tides - Feb 1982

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon3:509.64:198.910:080.210:270.26:574:51First Quarter1Mon
2Tue4:469.75:238.711:090.111:260.46:564:53First Quarter2Tue
3Wed5:489.86:328.612:160.06:554:54Waxing Gibbous3Wed
4Thu6:5310.07:408.812:310.51:24-0.36:544:55Waxing Gibbous4Thu
5Fri7:5810.48:439.11:370.32:28-0.76:524:57Waxing Gibbous5Fri
6Sat8:5810.79:419.52:390.03:26-1.16:514:58Full Moon6Sat
7Sun9:5411.010:359.83:36-0.34:20-1.46:504:59Full Moon7Sun
8Mon10:4811.111:2610.04:30-0.55:11-1.56:495:01Full Moon8Mon
9Tue11:3911.15:22-0.75:59-1.46:475:02Full Moon9Tue
10Wed12:1310.012:2710.86:12-0.66:45-1.26:465:03Waning Gibbous10Wed
11Thu12:599.91:1510.47:00-0.47:29-0.76:455:05Waning Gibbous11Thu
12Fri1:449.72:029.87:49-0.18:14-0.26:435:06Waning Gibbous12Fri
13Sat2:309.52:529.18:390.39:000.46:425:08Waning Gibbous13Sat
14Sun3:189.23:458.59:320.69:490.96:415:09Third Quarter14Sun
15Mon4:088.94:418.010:271.010:401.46:395:10Third Quarter15Mon
16Tue5:008.65:407.711:251.211:351.76:385:12Third Quarter16Tue
17Wed5:568.56:417.612:271.36:365:13Third Quarter17Wed
18Thu6:558.57:407.612:351.91:281.26:355:14Waning Crescent18Thu
19Fri7:508.78:327.91:331.82:210.96:335:16Waning Crescent19Fri
20Sat8:399.09:188.22:241.53:060.66:325:17Waning Crescent20Sat
21Sun9:239.49:598.53:091.23:470.26:305:18Waning Crescent21Sun
22Mon10:049.710:388.83:490.84:24-0.16:285:20New Moon22Mon
23Tue10:4310.011:149.24:280.55:00-0.46:275:21New Moon23Tue
24Wed11:2210.211:509.55:070.15:36-0.66:255:22New Moon24Wed
25Thu12:0010.35:47-0.26:12-0.76:245:24Waxing Crescent25Thu
26Fri12:269.812:4010.26:28-0.46:51-0.76:225:25Waxing Crescent26Fri
27Sat1:0410.01:2310.07:11-0.57:33-0.66:205:26Waxing Crescent27Sat
28Sun1:4610.12:109.77:59-0.58:19-0.36:195:27Waxing Crescent28Sun
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8418150)

Common Questions About Portland, ME Tides

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What time does the tide turn (slack tide) in Portland, ME today?

Slack tide in Portland, ME is approximately 3:08 am — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Is this week a spring tide or neap tide in Portland, ME?

Portland, ME is currently in a neap phase. Tonight's moon is 52% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly minimum.

What datum are Portland, ME tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Portland, ME?

Tide predictions for Portland, ME come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Portland, ME?

Tide data for Portland, ME is sourced from NOAA Station #8418150. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8418150.

What is the moon phase in Portland, ME tonight?

Tonight the moon over Portland, ME is First Quarter (52% illuminated). This places Portland, ME in a neap tide cycle, so tidal ranges are near their weekly minimum this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA