Tides Today & Tomorrow in Porpoise Key, Big Spanish Channel, FL

TIDE TIMES for Friday, August 21, 2026
The tide is currently falling in Porpoise Key, Big Spanish Channel, FL.

Next low tide : in 24m at 2:41 pm (0.4 ft)
Next high tide : 11:17 pm (0.7 ft)
Sunset today : 7:54 pm
Sunrise tomorrow : 7:02 am
Moon phase : First Quarter (65% illuminated)
Tide Station Location : Station #8724196
Common Questions About Tides

Porpoise Key, Big Spanish Channel, FL Tides - Mar 2045

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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	Wed			12:13	0.7	4:41	-0.4	4:07	0.0	6:47	6:27		1	Wed
2	Thu			12:46	0.8	5:20	-0.4	5:04	-0.2	6:46	6:28		2	Thu
3	Fri	12:52	1.3	1:19	1.0	5:56	-0.3	5:56	-0.3	6:45	6:28		3	Fri
4	Sat	1:42	1.2	1:52	1.1	6:31	-0.2	6:47	-0.4	6:44	6:29		4	Sat
5	Sun	2:29	1.1	2:26	1.2	7:04	-0.1	7:37	-0.5	6:43	6:29		5	Sun
6	Mon	3:16	1.0	3:01	1.2	7:38	0.0	8:29	-0.4	6:42	6:30		6	Mon
7	Tue	4:02	0.8	3:37	1.2	8:11	0.1	9:24	-0.4	6:41	6:30		7	Tue
8	Wed	4:50	0.6	4:17	1.1	8:45	0.2	10:24	-0.3	6:40	6:31		8	Wed
9	Thu	5:49	0.5	5:02	1.0	9:20	0.3	11:33	-0.2	6:39	6:31		9	Thu
10	Fri	7:25	0.4	6:01	0.9	10:05	0.4			6:38	6:32		10	Fri
11	Sat	9:54	0.4	7:21	0.9	12:50	-0.1	11:26 AM	0.5	6:37	6:32		11	Sat
12	Sun	11:49	0.4	9:48	0.9	3:06	0.0	2:03	0.5	7:36	7:33		12	Sun
13	Mon			12:16	0.5	4:09	0.0	3:21	0.5	7:35	7:33		13	Mon
14	Tue			12:36	0.6	4:53	0.0	4:20	0.4	7:34	7:34		14	Tue
15	Wed			12:54	0.7	5:27	0.0	5:07	0.3	7:33	7:34		15	Wed
16	Thu	12:33	1.1	1:15	0.8	5:55	0.0	5:47	0.1	7:32	7:35		16	Thu
17	Fri	1:14	1.1	1:37	0.9	6:21	0.0	6:24	0.0	7:31	7:35		17	Fri
18	Sat	1:53	1.1	2:02	1.0	6:45	0.1	7:00	-0.1	7:30	7:35		18	Sat
19	Sun	2:32	1.0	2:28	1.1	7:09	0.1	7:36	-0.2	7:29	7:36		19	Sun
20	Mon	3:11	1.0	2:56	1.1	7:33	0.1	8:14	-0.3	7:28	7:36		20	Mon
21	Tue	3:53	0.9	3:25	1.2	7:59	0.2	8:57	-0.4	7:27	7:37		21	Tue
22	Wed	4:37	0.8	3:57	1.2	8:26	0.2	9:46	-0.4	7:26	7:37		22	Wed
23	Thu	5:26	0.6	4:34	1.2	8:56	0.3	10:44	-0.4	7:25	7:38		23	Thu
24	Fri	6:27	0.5	5:21	1.2	9:30	0.4	11:53	-0.3	7:24	7:38		24	Fri
25	Sat	7:51	0.4	6:24	1.1	10:18	0.4			7:23	7:38		25	Sat
26	Sun	9:31	0.5	7:53	1.1	1:10	-0.2	11:39 AM	0.5	7:22	7:39		26	Sun
27	Mon	10:40	0.5	9:30	1.1	2:27	-0.2	1:25	0.5	7:21	7:39		27	Mon
28	Tue	11:24	0.7	10:51	1.2	3:32	-0.1	2:55	0.4	7:20	7:40		28	Tue
29	Wed			12:00	0.8	4:23	-0.1	4:07	0.2	7:19	7:40		29	Wed
30	Thu			12:34	1.0	5:05	0.0	5:07	0.0	7:18	7:41		30	Thu
31	Fri	12:54	1.2	1:07	1.1	5:43	0.0	6:00	-0.2	7:17	7:41		31	Fri
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8724196)

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What time does the tide turn (slack tide) in Porpoise Key, Big Spanish Channel, FL today?

Slack tide in Porpoise Key, Big Spanish Channel, FL is approximately 6:59 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 Porpoise Key, Big Spanish Channel, FL?

Porpoise Key, Big Spanish Channel, FL is currently in a transitional phase. Tonight's moon is 65% 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 Porpoise Key, Big Spanish Channel, 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 Porpoise Key, Big Spanish Channel, FL?

Tide predictions for Porpoise Key, Big Spanish Channel, 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 Porpoise Key, Big Spanish Channel, FL?

Tide data for Porpoise Key, Big Spanish Channel, FL is sourced from NOAA Station #8724196. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8724196.

What is the moon phase in Porpoise Key, Big Spanish Channel, FL tonight?

Tonight the moon over Porpoise Key, Big Spanish Channel, FL is First Quarter (65% illuminated). This places Porpoise Key, Big Spanish Channel, 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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