St. Marks River Entrance, FL tide times
NOAA tide prediction station 8728130, 30.0783° N, 84.1783° W. Heights in feet above MLLW.
Today at St. Marks River Entrance, FL
Today's predicted high and low waters, sunrise and sunset for St. Marks River Entrance, FL load here from NOAA. Without JavaScript they cannot be shown: NOAA's own table for station 8728130 is at tidesandcurrents.noaa.gov. Everything else on this page is measured and does not change from day to day.
What the tide does at St. Marks River Entrance, FL
Across the 1397 high and low waters NOAA predicts here for 2027, high water averages 3.23 ft above MLLW and low water 0.66 ft — a mean range of 2.58 ft. Taking each day's higher high and lower low, which is the swing someone standing on the shore actually sees, the average is 3.45 ft.
On 91% of days in 2027 there are two high waters and on the remaining 32 days only one. Where there are two, they differ in height by 0.52 ft on average. Successive high waters are 12h 33m apart on average.
The largest daily swing of 2027 is 5.31 ft on 4 July 2027 and the smallest is 1.71 ft on 6 November 2027 , a factor of 3.1 between the biggest spring tide and the smallest neap.
Measured figures
| Mean high water | 3.23 ft above MLLW |
|---|---|
| Mean low water | 0.66 ft above MLLW |
| Mean range | 2.58 ft |
| Mean great diurnal range | 3.45 ft |
| Largest daily range in 2027 | 5.31 ft on 4 July 2027 |
| Smallest daily range in 2027 | 1.71 ft on 6 November 2027 |
| Highest predicted tide | 4.44 ft at 2:34 PM on 2 August 2027 |
| Lowest predicted tide | -1.53 ft at 7:31 AM on 21 January 2027 |
| Average gap between high waters | 12h 33m |
| Tidal pattern | semidiurnal (1.91 high waters a day) |
| Position | 30.0783° N, 84.1783° W |
| NOAA station id | 8728130 |
Every figure above is computed from NOAA's published predictions for station 8728130 for the whole of 2027 (365 days, 1397 tides), not from a regional average or an estimate.
What MLLW means here
Every height on this page is feet above MLLW — mean lower low water, the chart datum NOAA publishes tide predictions against. It is the average of the lower of each day's low waters, taken over a 19-year period, so zero here is neither the sea bed nor the average sea level: it is a level the water drops below regularly. At St. Marks River Entrance, FL, 194 of the 699 low waters predicted for 2027 — 28% of them — fall below zero, the lowest being -1.53 ft on 21 January 2027.
Practically: a chart showing 6 ft of water here means about 6 ft at a mean lower low water and about 9.4 ft at a mean higher high. Add the predicted height for the moment you care about to the charted depth.
Where these predictions come from
This is a reference station: NOAA computes its predictions directly, from a harmonic analysis of water levels measured at this location, rather than by offsetting another station's table.
3 nearby stations take their predictions from this one by applying a time and height offset: Mandalay, Aucilla River, St. Marks, St. Marks River, Alligator Point, St. James Island.
Daylight at this latitude
St. Marks River Entrance, FL sits at 30.0783° N. The longest day of 2027 here is 14h 05m of daylight on 21 June 2027; the shortest is 10h 12m on 21 December 2027 — a difference of 3h 53m.
Day lengths are computed with NOAA's published solar algorithm from the station's latitude and longitude. Clock times for sunrise and sunset are deliberately not printed here: they depend on the station's UTC offset, and this site takes that offset from NOAA's own answers rather than from a timezone table — so it is the live panel above, which has them, that shows the times.
Nearest other stations
- Port Leon, FL 5.8 km (3.6 miles)
- St. Marks, St. Marks River, FL 8.7 km (5.4 miles)
- St. Marks, Wakulla River, FL 9.8 km (6.1 miles)
- Shell Point, Walker Creek, FL 11 km (6.9 miles)
- Mandalay, Aucilla River, FL 20 km (13 miles)
- Panacea, Dickerson Bay, FL 21 km (13 miles)
Put these tides on your own site
One line of HTML shows today's tides for St. Marks River Entrance, FL on any page:
<script src="https://tidedata.romermade.com/v1/embed.js" data-station="8728130" defer></script>No account, no key, no build step. How it works.