St. Augustine Tide ChartFirst Coast, Florida
Updated 10:32 AM EDT on Wednesday, August 26, 2026
The tide at St. Augustine is falling, currently 2.4 ft above MLLW, with the next low tide at 1:32 pm (0.5 ft). Today's range is 4.8 ft on a mixed semi-diurnal tide, in a neap period.
St. Augustine tide chart
Predicted water level at the St. Augustine Beach station, in feet above MLLW. Drag or hover the chart to read any point.
St. Augustine tide times — next 5 days
| Day | Tides | Range | Sun |
|---|---|---|---|
| TodayAug 26 | Low1:33 am0.8 ftHigh7:34 am4.4 ftLow1:32 pm0.5 ftHigh7:53 pm5.3 ft | 4.8 ft | 6:58 am7:54 pm |
| TomorrowAug 27 | Low2:09 am0.6 ftHigh8:14 am4.6 ftLow2:13 pm0.3 ftHigh8:32 pm5.3 ft | 5.0 ft | 6:59 am7:53 pm |
| FridayAug 28 | Low2:44 am0.4 ftHigh8:54 am4.9 ftLow2:53 pm0.3 ftHigh9:12 pm5.3 ft | 5.1 ft | 7:00 am7:51 pm |
| SaturdayAug 29 | Low3:18 am0.3 ftHigh9:34 am5.1 ftLow3:33 pm0.3 ftHigh9:51 pm5.3 ft | 5.0 ft | 7:00 am7:50 pm |
| SundayAug 30 | Low3:52 am0.3 ftHigh10:14 am5.2 ftLow4:14 pm0.3 ftHigh10:32 pm5.1 ft | 5.0 ft | 7:01 am7:49 pm |
Heights in feet above MLLW. Sunrise above, sunset below.
About the tide in St. Augustine
St. Augustine has the largest tide range of the six Florida towns on this site — the northeast Florida coast runs a solidly twice-daily tide of four to six feet, several times what the Gulf coast sees. That range drives serious water through the St. Augustine Inlet and up the Matanzas and Tolomato rivers, and it is the single most useful number for planning a day on this water.
Northeast Florida behaves much more like the Carolinas than like Tampa. You get two highs and two lows every day, close to equal in height, on a clean semi-diurnal rhythm — which makes the tide here unusually easy to plan around. Roughly six hours up, roughly six hours down, and a range big enough that the difference between high and low genuinely changes where you can go.
The St. Augustine Inlet is the pinch point. It is a dynamic, shoaling inlet whose channel migrates, and the combination of a five-foot range and an exposed Atlantic entrance means an ebb tide against an onshore northeast wind stacks up a steep breaking sea across the bar. This is a well-known local hazard, not a theoretical one. The inside water — the Matanzas River, the bayfront, the ICW — stays workable in far more conditions than the inlet does.
The bigger range also means the tide reaches well inland. Expect the high and low to arrive progressively later as you move up the rivers away from the inlet; the times below are for the beach.
St. Augustine tide questions
What time is high tide in St. Augustine today?
High tide in St. Augustine today is at 7:34 am (4.4 ft) and 7:53 pm (5.3 ft). The 7:53 pm high of 5.3 ft is the larger of the two — that difference between the day's two highs is called diurnal inequality and is normal here.
What time is low tide in St. Augustine today?
Low tide in St. Augustine today is at 1:33 am (0.8 ft) and 1:32 pm (0.5 ft).
What is the tide range in St. Augustine?
Today's range in St. Augustine — the difference between the day's highest high and lowest low — is 4.8 ft. The average over the next two weeks is 5.1 ft, so today is below-average. Range varies through the month on the spring–neap cycle.
Is this week a spring tide or a neap tide in St. Augustine?
This week is a neap tide period in St. Augustine — predicted daily ranges are at or near their smallest of the cycle. Spring tides bring the largest ranges and the strongest currents; neap tides the smallest. This is worked out from the predicted water levels themselves rather than from moon phase, which does not always line up — especially on the Gulf coast.
How many tides a day does St. Augustine get?
St. Augustine has a mixed semi-diurnal tide: two highs and two lows a day, but the two highs are noticeably unequal — averaging about 0.5 ft apart. That inequality is normal and predictable.
What time is sunrise and sunset in St. Augustine today?
Sunrise in St. Augustine today is at 6:58 am and sunset is at 7:54 pm. The moon is waxing gibbous, 97% illuminated.
What tide datum are these St. Augustine heights measured from?
All heights on this page are in feet above MLLW (mean lower low water), the standard chart datum used by NOAA for US tide predictions. A predicted height of 0.0 ft means water at the datum, not a dry bottom — and negative predictions do occur on the biggest spring lows.
How accurate are these St. Augustine tide predictions?
They are astronomical predictions from NOAA harmonic constituents for the St. Augustine Beach station, which is the same basis NOAA publishes its own tables on. They account for the motion of the sun and moon but not for weather. Sustained wind, barometric pressure and river flow can all push real water levels above or below the prediction, sometimes by a foot or more in a strong blow.
Why is the tide range at St. Augustine so much bigger than in Tampa or Sarasota?
The Atlantic coast of northeast Florida sits on a broad continental shelf that amplifies the tide, and it has an unobstructed connection to the open ocean. The Gulf of Mexico is a semi-enclosed basin whose geometry produces a much smaller and often once-daily tide. The result is four to six feet at St. Augustine against roughly two feet on the Gulf coast.
How does the tide affect crossing the St. Augustine Inlet?
Substantially. The inlet shoals and its channel moves, and an outgoing tide running against an onshore wind from the northeast builds a short, steep, breaking sea on the bar. The safest transits are generally on a flood tide or near slack water, with current local knowledge of where the channel actually is.
Can I get tides and a marine forecast for my own spot near St. Augustine?
Yes. The free SeaLegs AI app gives tide predictions plus wind, wave and an AI-rated GO / CAUTION / NO-GO call for any spot you drop a pin on — not just listed stations.
Other Florida tide charts
Fort Lauderdale tide chart, Jacksonville Beach tide chart, Ponce Inlet tide chart, Sarasota tide chart, Sebastian Inlet tide chart
Tides are one input. Get the whole picture.
SeaLegs AI puts tides next to wind, waves, period and an honest GO / CAUTION / NO-GO call for any spot you drop a pin on — not just listed stations. Free on iOS and Android.
- Station
- St. Augustine Beach
- NOAA ID
- 8720587
- Position
- 29.8567, -81.2633
- Datum
- MLLW
Astronomical tide predictions derived from NOAA harmonic constituents. These do not account for weather — sustained wind, barometric pressure and river flow can push actual water levels above or below the prediction. Not for navigation.