Florida tide station

Grassy Key, north side, Florida Bay tide times

Today, Sunday, October 18, 2026: high tide at 8:41 AM (1.4 ft) and 11:29 PM (1.0 ft); low tide at 2:18 AM (1.3 ft) and 5:29 PM (0.7 ft). Water temperature 85.5 F at Vaca Key, Florida Bay (11 mi away).

NOAA station 8723921 · Subordinate station · MLLW datum · times in EDT · sunrise 7:23 AM, sunset 6:54 PM · first quarter (51% lit)

Low tide▼

2:18AM

1.3FT MLLW

low

High tide▲

8:41AM

1.4FT MLLW

high

Low tide▼

5:29PM

0.7FT MLLW

low

High tide▲

11:29PM

1.0FT MLLW

high

Water temp°F

85.5

29.7C

Vaca Key, Florida Bay, 11 mi

predicted height above MLLWnightnow (build time; your browser updates it)

As of 5:20 AM the tide is rising toward high tide at 8:41 AM (1.4 ft).

First Quarter 51% litSunrise 7:23 AMSunset 6:54 PMDaylight 11h 30mEDT

High tide at Grassy Key, north side, Florida Bay, Florida on October 18, 2026 is at 8:41 AM (1.4 ft above MLLW) and 11:29 PM (1.0 ft above MLLW).
Low tide at Grassy Key, north side, Florida Bay on October 18, 2026 is at 2:18 AM (1.3 ft) and 5:29 PM (0.7 ft).
Today's tidal range at Grassy Key, north side, Florida Bay is 0.7 ft (highest high 1.4 ft, lowest low 0.7 ft).
The nearest NOAA water temperature to Grassy Key, north side, Florida Bay is 85.5 F at Vaca Key, Florida Bay (11 mi away), as of October 18, 2026.
Sunrise 7:23 AM, sunset 6:54 PM (EDT); moon first quarter, 51% illuminated.
Predictions are NOAA CO-OPS tide predictions for station 8723921 (subordinate station), heights above MLLW.

Next 7 days at Grassy Key, north side, Florida Bay

Date	Tide 1	Tide 2	Tide 3	Tide 4	Sunrise	Sunset	Moon
Sun Oct 18today	2:18 AM1.3 ft	8:41 AM1.4 ft	5:29 PM0.7 ft	11:29 PM1.0 ft	7:23 AM	6:54 PM	51%
Mon Oct 19	4:09 AM1.3 ft	9:56 AM1.4 ft	6:31 PM0.8 ft		7:24 AM	6:53 PM	61%
Tue Oct 20	12:25 AM1.1 ft	5:55 AM1.3 ft	11:16 AM1.4 ft	7:21 PM0.8 ft	7:24 AM	6:53 PM	71%
Wed Oct 21	12:57 AM1.2 ft	7:07 AM1.2 ft	12:27 PM1.4 ft	8:01 PM0.8 ft	7:25 AM	6:52 PM	80%
Thu Oct 22	1:25 AM1.3 ft	8:03 AM1.0 ft	1:26 PM1.5 ft	8:35 PM0.9 ft	7:25 AM	6:51 PM	88%
Fri Oct 23	1:53 AM1.4 ft	8:51 AM0.8 ft	2:19 PM1.5 ft	9:06 PM0.9 ft	7:26 AM	6:50 PM	94%
Sat Oct 24	2:22 AM1.5 ft	9:35 AM0.5 ft	3:08 PM1.5 ft	9:37 PM0.9 ft	7:26 AM	6:49 PM	98%

Water temperature near Grassy Key, north side, Florida Bay

85.5 F (29.7 C)

NOAA CO-OPS station 8723970 (Vaca Key, Florida Bay sensor, 11 mi away), read 5:00 AM local, October 18, 2026

Over the past 30 days this sensor ranged from 81.3 to 88.9 F. Typical for October here is 82.6 F (5-year hourly mean; range 73.4 to 90.1), so today is 2.9 F above typical.

Water temperature is the nearest NOAA reading to Grassy Key, north side, Florida Bay, not a measurement at the tide gauge itself (this station has no water-temperature sensor). See water temperature by state for every sensor and buoy.

Tide tables

High (▲) and low (▼) tides in EDT with sunrise, sunset and moon illumination. CSV of today's tides for every Florida station.

October 2026 tide table

Date	Tide 1	Tide 2	Tide 3	Tide 4	Sunrise	Sunset	Moon
Thu Oct 1					7:16 AM	7:11 PM	72%
Fri Oct 2					7:16 AM	7:10 PM	62%
Sat Oct 3					7:17 AM	7:09 PM	52%
Sun Oct 4					7:17 AM	7:08 PM	41%
Mon Oct 5					7:18 AM	7:07 PM	31%
Tue Oct 6					7:18 AM	7:06 PM	22%
Wed Oct 7					7:18 AM	7:05 PM	14%
Thu Oct 8					7:19 AM	7:04 PM	7%
Fri Oct 9					7:19 AM	7:03 PM	3%
Sat Oct 10					7:20 AM	7:02 PM	0%
Sun Oct 11					7:20 AM	7:01 PM	0%
Mon Oct 12					7:21 AM	7:00 PM	2%
Tue Oct 13					7:21 AM	6:59 PM	7%
Wed Oct 14					7:21 AM	6:58 PM	13%
Thu Oct 15					7:22 AM	6:57 PM	21%
Fri Oct 16	1:10 AM1.1 ft	6:55 AM1.6 ft	3:14 PM0.6 ft	8:38 PM1.0 ft	7:22 AM	6:56 PM	30%
Sat Oct 17	1:37 AM1.2 ft	7:43 AM1.5 ft	4:20 PM0.7 ft	9:54 PM0.9 ft	7:23 AM	6:55 PM	40%
Sun Oct 18today	2:18 AM1.3 ft	8:41 AM1.4 ft	5:29 PM0.7 ft	11:29 PM1.0 ft	7:23 AM	6:54 PM	51%
Mon Oct 19	4:09 AM1.3 ft	9:56 AM1.4 ft	6:31 PM0.8 ft		7:24 AM	6:53 PM	61%
Tue Oct 20	12:25 AM1.1 ft	5:55 AM1.3 ft	11:16 AM1.4 ft	7:21 PM0.8 ft	7:24 AM	6:53 PM	71%
Wed Oct 21	12:57 AM1.2 ft	7:07 AM1.2 ft	12:27 PM1.4 ft	8:01 PM0.8 ft	7:25 AM	6:52 PM	80%
Thu Oct 22	1:25 AM1.3 ft	8:03 AM1.0 ft	1:26 PM1.5 ft	8:35 PM0.9 ft	7:25 AM	6:51 PM	88%
Fri Oct 23	1:53 AM1.4 ft	8:51 AM0.8 ft	2:19 PM1.5 ft	9:06 PM0.9 ft	7:26 AM	6:50 PM	94%
Sat Oct 24	2:22 AM1.5 ft	9:35 AM0.5 ft	3:08 PM1.5 ft	9:37 PM0.9 ft	7:26 AM	6:49 PM	98%
Sun Oct 25	2:53 AM1.6 ft	10:18 AM0.3 ft	3:57 PM1.4 ft	10:08 PM0.9 ft	7:27 AM	6:49 PM	100%
Mon Oct 26	3:26 AM1.7 ft	11:02 AM0.1 ft	4:45 PM1.4 ft	10:40 PM0.9 ft	7:28 AM	6:48 PM	99%
Tue Oct 27	4:03 AM1.8 ft	11:48 AM-0.0 ft	5:34 PM1.3 ft	11:15 PM0.9 ft	7:28 AM	6:47 PM	97%
Wed Oct 28	4:44 AM1.8 ft	12:37 PM-0.1 ft	6:25 PM1.1 ft	11:51 PM0.9 ft	7:29 AM	6:46 PM	92%
Thu Oct 29	5:29 AM1.9 ft	1:31 PM0.0 ft	7:19 PM1.0 ft		7:29 AM	6:46 PM	85%
Fri Oct 30	12:31 AM0.9 ft	6:21 AM1.8 ft	2:31 PM0.1 ft	8:18 PM1.0 ft	7:30 AM	6:45 PM	77%
Sat Oct 31	1:20 AM1.0 ft	7:19 AM1.7 ft	3:39 PM0.3 ft	9:26 PM1.0 ft	7:30 AM	6:44 PM	68%

November 2026 tide table

Date	Tide 1	Tide 2	Tide 3	Tide 4	Sunrise	Sunset	Moon
Sun Nov 1	1:25 AM1.1 ft	7:29 AM1.6 ft	3:50 PM0.5 ft	9:39 PM1.0 ft	6:31 AM	5:44 PM	57%
Mon Nov 2	2:57 AM1.1 ft	8:53 AM1.5 ft	4:56 PM0.6 ft	10:43 PM1.1 ft	6:32 AM	5:43 PM	46%
Tue Nov 3	4:35 AM1.0 ft	10:23 AM1.5 ft	5:53 PM0.7 ft	11:32 PM1.2 ft	6:32 AM	5:42 PM	36%
Wed Nov 4	5:58 AM0.9 ft	11:43 AM1.4 ft	6:40 PM0.8 ft		6:33 AM	5:42 PM	26%
Thu Nov 5	12:13 AM1.4 ft	7:06 AM0.7 ft	12:48 PM1.4 ft	7:21 PM0.9 ft	6:34 AM	5:41 PM	17%
Fri Nov 6	12:50 AM1.5 ft	8:02 AM0.5 ft	1:43 PM1.4 ft	7:58 PM0.9 ft	6:34 AM	5:41 PM	10%
Sat Nov 7	1:23 AM1.6 ft	8:50 AM0.3 ft	2:32 PM1.3 ft	8:33 PM0.9 ft	6:35 AM	5:40 PM	5%
Sun Nov 8	1:56 AM1.7 ft	9:32 AM0.2 ft	3:15 PM1.2 ft	9:07 PM0.9 ft	6:35 AM	5:39 PM	1%
Mon Nov 9	2:28 AM1.7 ft	10:12 AM0.1 ft	3:54 PM1.2 ft	9:39 PM0.9 ft	6:36 AM	5:39 PM	0%
Tue Nov 10	3:01 AM1.7 ft	10:50 AM0.1 ft	4:31 PM1.1 ft	10:11 PM0.9 ft	6:37 AM	5:39 PM	1%
Wed Nov 11	3:35 AM1.6 ft	11:29 AM0.1 ft	5:08 PM1.0 ft	10:42 PM0.9 ft	6:37 AM	5:38 PM	4%
Thu Nov 12	4:11 AM1.6 ft	12:10 PM0.2 ft	5:46 PM1.0 ft	11:12 PM0.9 ft	6:38 AM	5:38 PM	10%
Fri Nov 13	4:49 AM1.6 ft	12:54 PM0.3 ft	6:27 PM0.9 ft	11:43 PM1.0 ft	6:39 AM	5:37 PM	17%
Sat Nov 14	5:30 AM1.5 ft	1:42 PM0.4 ft	7:14 PM0.9 ft		6:39 AM	5:37 PM	25%
Sun Nov 15	12:20 AM1.1 ft	6:15 AM1.4 ft	2:35 PM0.5 ft	8:07 PM0.9 ft	6:40 AM	5:37 PM	35%
Mon Nov 16	1:16 AM1.1 ft	7:08 AM1.4 ft	3:30 PM0.6 ft	9:04 PM1.0 ft	6:41 AM	5:36 PM	45%
Tue Nov 17	2:45 AM1.1 ft	8:12 AM1.3 ft	4:23 PM0.7 ft	9:57 PM1.1 ft	6:42 AM	5:36 PM	56%
Wed Nov 18	4:19 AM1.1 ft	9:28 AM1.2 ft	5:10 PM0.7 ft	10:41 PM1.2 ft	6:42 AM	5:36 PM	66%
Thu Nov 19	5:33 AM0.9 ft	10:46 AM1.2 ft	5:52 PM0.8 ft	11:19 PM1.3 ft	6:43 AM	5:35 PM	76%
Fri Nov 20	6:34 AM0.7 ft	11:57 AM1.2 ft	6:31 PM0.8 ft	11:55 PM1.4 ft	6:44 AM	5:35 PM	84%
Sat Nov 21	7:27 AM0.4 ft	12:59 PM1.2 ft	7:09 PM0.8 ft		6:44 AM	5:35 PM	91%
Sun Nov 22	12:32 AM1.5 ft	8:16 AM0.1 ft	1:56 PM1.1 ft	7:48 PM0.8 ft	6:45 AM	5:35 PM	96%
Mon Nov 23	1:11 AM1.6 ft	9:04 AM-0.1 ft	2:49 PM1.1 ft	8:26 PM0.7 ft	6:46 AM	5:35 PM	99%
Tue Nov 24	1:53 AM1.7 ft	9:51 AM-0.3 ft	3:40 PM1.0 ft	9:06 PM0.7 ft	6:47 AM	5:34 PM	100%
Wed Nov 25	2:39 AM1.8 ft	10:40 AM-0.4 ft	4:29 PM1.0 ft	9:48 PM0.7 ft	6:47 AM	5:34 PM	98%
Thu Nov 26	3:29 AM1.8 ft	11:30 AM-0.4 ft	5:18 PM0.9 ft	10:33 PM0.6 ft	6:48 AM	5:34 PM	95%
Fri Nov 27	4:22 AM1.8 ft	12:23 PM-0.2 ft	6:08 PM0.9 ft	11:23 PM0.6 ft	6:49 AM	5:34 PM	89%
Sat Nov 28	5:18 AM1.7 ft	1:19 PM-0.1 ft	6:59 PM0.9 ft		6:49 AM	5:34 PM	81%
Sun Nov 29	12:22 AM0.7 ft	6:17 AM1.6 ft	2:17 PM0.1 ft	7:52 PM0.9 ft	6:50 AM	5:34 PM	73%
Mon Nov 30	1:35 AM0.7 ft	7:23 AM1.4 ft	3:15 PM0.3 ft	8:49 PM1.0 ft	6:51 AM	5:34 PM	63%

How these predictions are made

Grassy Key, north side, Florida Bay is a subordinate station: NOAA derives its tides from the reference station Key West by applying fixed offsets.

High tide time

+5h 40m

relative to Key West

Low tide time

+6h 48m

relative to reference

High tide height

x0.73

ratio

Low tide height

x1.04

ratio

Nearby tide stations

Toms Harbor Channel, Hwy. 1 bridge1.1 mi · next high 8:08 AM
Grassy Key, south side, Hawk Channel1.6 mi · next high 4:57 PM
Duck Key, Hawk Channel1.7 mi · next high 4:38 PM
Toms Harbor Cut2.2 mi · next high 4:30 PM
Conch Key, eastern end3.8 mi · next high 4:40 PM
Fat Deer Key, Florida Bay5.5 mi · next high 8:10 AM

Questions

What time is high tide at Grassy Key, north side, Florida Bay today?

High tide at Grassy Key, north side, Florida Bay, Florida on Sunday, October 18, 2026 is at 8:41 AM (1.4 ft above MLLW) and 11:29 PM (1.0 ft above MLLW), NOAA prediction, local time.

What time is low tide at Grassy Key, north side, Florida Bay today?

Low tide at Grassy Key, north side, Florida Bay on Sunday, October 18, 2026 is at 2:18 AM (1.3 ft) and 5:29 PM (0.7 ft).

What is the water temperature at Grassy Key, north side, Florida Bay?

The nearest NOAA water-temperature reading to Grassy Key, north side, Florida Bay is 85.5 F at Vaca Key, Florida Bay (11 mi away), as of October 18, 2026.

Not for navigation. Predictions do not include weather; wind and pressure can move the real water level by a foot or more. Source: NOAA CO-OPS station 8723921.