Tides Today & Tomorrow in Rock Harbor, Key Largo, FL

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Rock Harbor, Key Largo, FL.

Next low tide : 8:07 pm (0.7 ft)
Next high tide : in 5m at 2:00 pm (2.3 ft)
Sunset today : 7:54 pm
Sunrise tomorrow : 6:57 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8723689
Common Questions About Tides

Rock Harbor, Key Largo, FL Tides - Nov 1999

< Oct 1999

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Dec 1999 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Mon	2:57	2.6	3:37	2.7	9:12	0.6	9:50	0.8	6:29	5:41		1	Mon
2	Tue	4:05	2.6	4:38	2.7	10:16	0.7	10:49	0.7	6:29	5:40		2	Tue
3	Wed	5:08	2.7	5:33	2.7	11:14	0.7	11:41	0.5	6:30	5:40		3	Wed
4	Thu	6:04	2.7	6:22	2.7			12:06	0.6	6:31	5:39		4	Thu
5	Fri	6:52	2.8	7:06	2.7	12:27	0.4	12:52	0.6	6:31	5:39		5	Fri
6	Sat	7:36	2.8	7:46	2.7	1:10	0.3	1:34	0.6	6:32	5:38		6	Sat
7	Sun	8:15	2.9	8:23	2.7	1:49	0.3	2:14	0.6	6:32	5:37		7	Sun
8	Mon	8:53	2.8	8:59	2.6	2:27	0.3	2:52	0.7	6:33	5:37		8	Mon
9	Tue	9:30	2.8	9:35	2.6	3:04	0.3	3:29	0.7	6:34	5:36		9	Tue
10	Wed	10:07	2.7	10:12	2.5	3:40	0.4	4:06	0.8	6:34	5:36		10	Wed
11	Thu	10:45	2.6	10:50	2.4	4:16	0.5	4:43	0.9	6:35	5:35		11	Thu
12	Fri	11:25	2.6	11:30	2.3	4:52	0.6	5:22	1.0	6:36	5:35		12	Fri
13	Sat			12:08	2.5	5:32	0.7	6:05	1.1	6:37	5:35		13	Sat
14	Sun	12:15	2.3	12:54	2.4	6:16	0.8	6:54	1.1	6:37	5:34		14	Sun
15	Mon	1:06	2.2	1:45	2.3	7:09	0.9	7:52	1.1	6:38	5:34		15	Mon
16	Tue	2:03	2.2	2:39	2.3	8:10	0.9	8:52	1.0	6:39	5:33		16	Tue
17	Wed	3:06	2.2	3:36	2.4	9:14	0.9	9:50	0.8	6:39	5:33		17	Wed
18	Thu	4:08	2.4	4:32	2.4	10:15	0.8	10:44	0.5	6:40	5:33		18	Thu
19	Fri	5:08	2.5	5:26	2.5	11:11	0.6	11:35	0.3	6:41	5:33		19	Fri
20	Sat	6:05	2.7	6:18	2.7			12:04	0.4	6:41	5:32		20	Sat
21	Sun	6:58	2.9	7:09	2.8	12:25	0.0	12:55	0.3	6:42	5:32		21	Sun
22	Mon	7:50	3.0	8:00	2.9	1:14	-0.3	1:45	0.2	6:43	5:32		22	Mon
23	Tue	8:41	3.1	8:50	2.9	2:04	-0.4	2:35	0.1	6:44	5:32		23	Tue
24	Wed	9:32	3.1	9:42	2.9	2:54	-0.5	3:26	0.1	6:44	5:32		24	Wed
25	Thu	10:23	3.1	10:35	2.8	3:46	-0.5	4:18	0.2	6:45	5:31		25	Thu
26	Fri	11:16	3.0	11:31	2.7	4:39	-0.3	5:14	0.2	6:46	5:31		26	Fri
27	Sat			12:11	2.8	5:37	-0.1	6:14	0.3	6:46	5:31		27	Sat
28	Sun	12:29	2.6	1:07	2.7	6:38	0.1	7:17	0.4	6:47	5:31		28	Sun
29	Mon	1:31	2.5	2:06	2.6	7:42	0.3	8:22	0.5	6:48	5:31		29	Mon
30	Tue	2:35	2.4	3:06	2.5	8:48	0.4	9:25	0.4	6:49	5:31		30	Tue
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8723689)

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What time does the tide turn (slack tide) in Rock Harbor, Key Largo, FL today?

Slack tide in Rock Harbor, Key Largo, FL is approximately 5:03 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 Rock Harbor, Key Largo, FL?

Rock Harbor, Key Largo, FL is currently in a transitional phase. Tonight's moon is 36% 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 shifting between spring and neap.

What datum are Rock Harbor, Key Largo, FL 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 Rock Harbor, Key Largo, FL?

Tide predictions for Rock Harbor, Key Largo, FL 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 Rock Harbor, Key Largo, FL?

Tide data for Rock Harbor, Key Largo, FL is sourced from NOAA Station #8723689. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8723689.

What is the moon phase in Rock Harbor, Key Largo, FL tonight?

Tonight the moon over Rock Harbor, Key Largo, FL is First Quarter (36% illuminated). This places Rock Harbor, Key Largo, FL in a transitional tide cycle, so tidal ranges are shifting between spring and neap 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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