Tides Today & Tomorrow in Cos Cob Harbor, CT

TIDE TIMES for Friday, September 18, 2026
The tide is currently falling in Cos Cob Harbor, CT.

Next low tide : in 4h 22m at 11:20 am (1.9 ft)
Next high tide : 5:26 pm (7.0 ft)
Sunset today : 6:58 pm
Sunrise tomorrow : 6:38 am
Moon phase : First Quarter (48% illuminated)
Tide Station Location : Station #8469549
Common Questions About Tides

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DiMillo's Yacht Sales office and two RIBs in the parking lot.

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Cos Cob Harbor, CT Tides - Apr 1958

< Mar 1958

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May 1958 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Tue	8:30	7.8	8:57	8.1	2:29	-0.3	2:58	-0.4	5:38	6:18		1	Tue
2	Wed	9:24	8.2	9:48	8.6	3:25	-0.8	3:49	-0.7	5:36	6:19		2	Wed
3	Thu	10:16	8.4	10:38	8.9	4:18	-1.2	4:39	-0.9	5:34	6:20		3	Thu
4	Fri	11:07	8.5	11:28	9.1	5:10	-1.4	5:29	-1.0	5:33	6:21		4	Fri
5	Sat	11:59	8.4			6:01	-1.4	6:18	-0.9	5:31	6:22		5	Sat
6	Sun	12:19	9.0	12:51	8.2	6:53	-1.3	7:10	-0.6	5:29	6:24		6	Sun
7	Mon	1:11	8.7	1:44	7.9	7:46	-0.9	8:03	-0.3	5:28	6:25		7	Mon
8	Tue	2:05	8.3	2:40	7.5	8:40	-0.5	9:00	0.1	5:26	6:26		8	Tue
9	Wed	3:01	7.9	3:37	7.2	9:38	-0.1	10:00	0.5	5:24	6:27		9	Wed
10	Thu	4:01	7.4	4:38	7.0	10:37	0.3	11:02	0.7	5:23	6:28		10	Thu
11	Fri	5:03	7.1	5:40	6.9	11:38	0.6			5:21	6:29		11	Fri
12	Sat	6:07	6.9	6:41	6.9	12:05	0.8	12:37	0.7	5:20	6:30		12	Sat
13	Sun	7:08	6.8	7:37	7.0	1:05	0.8	1:32	0.7	5:18	6:31		13	Sun
14	Mon	8:03	6.9	8:26	7.3	2:01	0.6	2:22	0.7	5:17	6:32		14	Mon
15	Tue	8:51	7.0	9:10	7.5	2:51	0.4	3:07	0.6	5:15	6:33		15	Tue
16	Wed	9:35	7.2	9:50	7.6	3:35	0.2	3:48	0.5	5:13	6:34		16	Wed
17	Thu	10:15	7.3	10:27	7.7	4:16	0.0	4:27	0.5	5:12	6:35		17	Thu
18	Fri	10:53	7.3	11:03	7.8	4:55	-0.1	5:04	0.5	5:10	6:36		18	Fri
19	Sat	11:31	7.3	11:38	7.7	5:32	-0.1	5:40	0.5	5:09	6:37		19	Sat
20	Sun			12:09	7.3	6:09	-0.1	6:17	0.6	5:07	6:38		20	Sun
21	Mon	12:15	7.7	12:47	7.2	6:46	0.0	6:55	0.7	5:06	6:39		21	Mon
22	Tue	12:52	7.6	1:27	7.1	7:25	0.1	7:35	0.8	5:04	6:40		22	Tue
23	Wed	1:33	7.5	2:09	7.1	8:07	0.2	8:18	0.8	5:03	6:42		23	Wed
24	Thu	2:17	7.4	2:55	7.0	8:52	0.4	9:08	0.9	5:02	6:43		24	Thu
25	Fri	3:06	7.3	3:46	7.0	9:43	0.5	10:03	0.9	5:00	6:44		25	Fri
26	Sat	4:01	7.3	4:41	7.1	10:39	0.5	11:04	0.8	4:59	6:45		26	Sat
27	Sun	6:01	7.3	6:40	7.3			12:37	0.5	5:57	7:46		27	Sun
28	Mon	7:04	7.3	7:39	7.6	1:06	0.6	1:36	0.3	5:56	7:47		28	Mon
29	Tue	8:07	7.5	8:37	8.1	2:09	0.2	2:34	0.1	5:55	7:48		29	Tue
30	Wed	9:07	7.8	9:32	8.5	3:08	-0.2	3:30	-0.2	5:53	7:49		30	Wed
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8469549)

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Is this week a spring tide or neap tide in Cos Cob Harbor, CT?

Cos Cob Harbor, CT is currently in a neap phase. Tonight's moon is 48% 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 Cos Cob Harbor, CT 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 Cos Cob Harbor, CT?

Tide predictions for Cos Cob Harbor, CT 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 Cos Cob Harbor, CT?

Tide data for Cos Cob Harbor, CT is sourced from NOAA Station #8469549. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8469549.

What is the moon phase in Cos Cob Harbor, CT tonight?

Tonight the moon over Cos Cob Harbor, CT is First Quarter (48% illuminated). This places Cos Cob Harbor, CT 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

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