Tides Today & Tomorrow in Grassy Key, north side, Florida Bay, FL

TIDE TIMES for Tuesday, September 15, 2026
The tide is currently rising in Grassy Key, north side, Florida Bay, FL.

Next low tide : 1:58 pm (0.4 ft)
Next high tide : in 1h 37m at 6:19 am (1.6 ft)
Sunset today : 7:27 pm
Sunrise tomorrow : 7:09 am
Moon phase : Waxing Crescent (21% illuminated)
Tide Station Location : Station #8723921
Common Questions About Tides

Grassy Key, north side, Florida Bay, FL Tides - Mar 1877

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Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Thu	4:23	1.2	4:32	1.1	11:13	-0.2	11:31	-0.5	6:50	6:30		1	Thu
2	Fri	5:11	1.1	5:06	1.2	11:46	-0.1			6:49	6:30		2	Fri
3	Sat	5:58	0.9	5:42	1.2	12:23	-0.5	12:20	0.1	6:48	6:31		3	Sat
4	Sun	6:46	0.7	6:20	1.2	1:18	-0.4	12:54	0.2	6:47	6:31		4	Sun
5	Mon	7:39	0.5	7:02	1.1	2:16	-0.3	1:28	0.3	6:46	6:32		5	Mon
6	Tue	8:53	0.4	7:53	1.0	3:22	-0.2	2:08	0.4	6:45	6:32		6	Tue
7	Wed	11:12	0.4	9:03	0.9	4:37	-0.1	3:06	0.5	6:44	6:33		7	Wed
8	Thu			12:52	0.4	5:56	-0.1	4:38	0.5	6:43	6:33		8	Thu
9	Fri			1:30	0.5	7:08	-0.1	6:06	0.5	6:42	6:34		9	Fri
10	Sat			1:54	0.6	8:01	-0.1	7:14	0.4	6:41	6:34		10	Sat
11	Sun	12:47	1.0	2:13	0.6	8:39	-0.1	8:07	0.3	6:40	6:35		11	Sun
12	Mon	1:34	1.0	2:32	0.7	9:09	-0.1	8:51	0.2	6:39	6:35		12	Mon
13	Tue	2:15	1.1	2:52	0.8	9:36	0.0	9:29	0.1	6:38	6:36		13	Tue
14	Wed	2:54	1.1	3:15	0.9	10:01	0.0	10:05	0.0	6:37	6:36		14	Wed
15	Thu	3:32	1.1	3:40	1.0	10:25	0.0	10:40	-0.2	6:36	6:36		15	Thu
16	Fri	4:10	1.0	4:06	1.1	10:48	0.1	11:17	-0.3	6:35	6:37		16	Fri
17	Sat	4:50	1.0	4:33	1.1	11:12	0.1	11:56	-0.4	6:34	6:37		17	Sat
18	Sun	5:31	0.8	5:02	1.2	11:37	0.2			6:33	6:38		18	Sun
19	Mon	6:17	0.7	5:35	1.2	12:41	-0.4	12:04	0.3	6:32	6:38		19	Mon
20	Tue	7:09	0.6	6:13	1.2	1:33	-0.4	12:34	0.3	6:31	6:39		20	Tue
21	Wed	8:19	0.5	7:04	1.1	2:35	-0.3	1:10	0.4	6:30	6:39		21	Wed
22	Thu	9:59	0.4	8:17	1.1	3:49	-0.3	2:05	0.5	6:29	6:39		22	Thu
23	Fri	11:33	0.5	9:54	1.1	5:09	-0.2	3:42	0.5	6:28	6:40		23	Fri
24	Sat			12:27	0.6	6:23	-0.2	5:25	0.5	6:27	6:40		24	Sat
25	Sun			1:06	0.7	7:22	-0.2	6:48	0.3	6:26	6:41		25	Sun
26	Mon	12:39	1.2	1:40	0.9	8:09	-0.1	7:54	0.1	6:25	6:41		26	Mon
27	Tue	1:41	1.3	2:13	1.0	8:49	-0.1	8:52	-0.1	6:24	6:42		27	Tue
28	Wed	2:36	1.3	2:46	1.2	9:25	0.0	9:43	-0.3	6:23	6:42		28	Wed
29	Thu	3:27	1.2	3:19	1.3	9:59	0.1	10:32	-0.5	6:21	6:42		29	Thu
30	Fri	4:14	1.1	3:53	1.3	10:33	0.1	11:19	-0.5	6:20	6:43		30	Fri
31	Sat	5:00	1.0	4:28	1.4	11:06	0.2			6:19	6:43		31	Sat
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8723921)

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Is this week a spring tide or neap tide in Grassy Key, north side, Florida Bay, FL?

Grassy Key, north side, Florida Bay, FL is currently in a transitional phase. Tonight's moon is 21% 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 Grassy Key, north side, Florida Bay, 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 Grassy Key, north side, Florida Bay, FL?

Tide predictions for Grassy Key, north side, Florida Bay, 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 Grassy Key, north side, Florida Bay, FL?

Tide data for Grassy Key, north side, Florida Bay, FL is sourced from NOAA Station #8723921. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8723921.

What is the moon phase in Grassy Key, north side, Florida Bay, FL tonight?

Tonight the moon over Grassy Key, north side, Florida Bay, FL is Waxing Crescent (21% illuminated). This places Grassy Key, north side, Florida Bay, 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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