Tides Today & Tomorrow in Chelsea, MA

TIDE TIMES for Thursday, August 20, 2026
The tide is currently rising in Chelsea, MA.
Next low tide (tomorrow) : 12:21 am (1.4 ft)
Next high tide : in 2h 20m at 6:00 pm (9.3 ft)
Sunset today : 7:38 pm
Sunrise tomorrow : 5:56 am
Moon phase : First Quarter (55% illuminated)
Tide Station Location : Station #8443725
Common Questions About Tides

Chelsea, MA Tides - Oct 1941

DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed8:029.98:2410.41:340.11:570.65:405:26Waxing Gibbous1Wed
2Thu8:5710.19:1710.42:310.22:530.55:425:24Waxing Gibbous2Thu
3Fri9:4510.210:0510.33:210.23:430.45:435:23Full Moon3Fri
4Sat10:2710.210:4810.14:060.34:270.35:445:21Full Moon4Sat
5Sun11:0510.211:269.94:460.45:070.35:455:19Full Moon5Sun
6Mon11:4010.15:240.65:460.35:465:18Full Moon6Mon
7Tue12:029.712:1410.06:010.86:240.45:475:16Waning Gibbous7Tue
8Wed12:389.512:509.96:391.07:040.55:485:14Waning Gibbous8Wed
9Thu1:169.31:289.87:191.27:470.75:495:12Waning Gibbous9Thu
10Fri1:579.02:099.68:021.58:330.95:515:11Waning Gibbous10Fri
11Sat2:428.82:559.48:491.79:211.15:525:09Third Quarter11Sat
12Sun3:308.63:459.29:391.910:131.25:535:07Third Quarter12Sun
13Mon4:238.54:399.110:322.011:071.35:545:06Third Quarter13Mon
14Tue5:208.55:389.111:282.05:555:04Third Quarter14Tue
15Wed6:188.76:379.312:021.212:251.75:565:03Waning Crescent15Wed
16Thu7:139.17:339.712:560.91:201.25:575:01Waning Crescent16Thu
17Fri8:049.78:2510.11:480.62:120.65:594:59Waning Crescent17Fri
18Sat8:5210.49:1610.52:380.13:03-0.16:004:58Waning Crescent18Sat
19Sun9:3911.010:0510.93:27-0.33:54-0.76:014:56New Moon19Sun
20Mon10:2611.610:5511.24:15-0.64:43-1.36:024:55New Moon20Mon
21Tue11:1312.011:4411.35:02-0.95:32-1.76:034:53New Moon21Tue
22Wed12:0212.35:50-1.06:22-1.96:054:52Waxing Crescent22Wed
23Thu12:3511.212:5312.36:40-0.97:14-1.86:064:50Waxing Crescent23Thu
24Fri1:2911.01:4712.07:33-0.68:09-1.56:074:49Waxing Crescent24Fri
25Sat2:2510.72:4411.68:29-0.29:06-1.06:084:47First Quarter25Sat
26Sun3:2510.33:4511.19:280.210:06-0.66:094:46First Quarter26Sun
27Mon4:2810.04:4910.610:290.611:07-0.16:114:44First Quarter27Mon
28Tue5:349.85:5810.211:330.86:124:43First Quarter28Tue
29Wed6:409.87:0410.012:090.212:370.86:134:42Waxing Gibbous29Wed
30Thu7:409.98:039.91:090.41:380.86:144:40Waxing Gibbous30Thu
31Fri8:3210.18:569.82:040.52:330.76:164:39Waxing Gibbous31Fri
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8443725)

Common Questions About Chelsea, MA Tides

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What time does the tide turn (slack tide) in Chelsea, MA today?

Slack tide in Chelsea, MA is approximately 9:10 pm — 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 Chelsea, MA?

Chelsea, MA is currently in a neap phase. Tonight's moon is 55% 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 Chelsea, MA 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 Chelsea, MA?

Tide predictions for Chelsea, MA 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 Chelsea, MA?

Tide data for Chelsea, MA is sourced from NOAA Station #8443725. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8443725.

What is the moon phase in Chelsea, MA tonight?

Tonight the moon over Chelsea, MA is First Quarter (55% illuminated). This places Chelsea, MA 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