Hawaii & the Territories
Johns Folly Bay
St. John Island · Puerto Rico · NOAA station 9751274 · Tide predictions
18.3170, -64.7021
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48-hour outlook
Drag across the curve to inspect any time. Weather icons show the forecast at each high tide.
Drawn from the high/low predictions — NOAA publishes high/low only for this station.
The next seven days
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H = high tide · L = low tide · highs & lows in local time
On the water nearby
Vieques Island buoy · 50 mi W · Station 41056
Wind & wave reports →
Nearby tide stations
- Lameshur Bay, St. Johns Island · 1.5 mi W
- Coral Harbor, St. Johns · 2.4 mi NW
- Haulover Bay, St. Johns · 2.7 mi NE
- Leinster Point, Leinster Bay, St. Johns Island · 3.7 mi N
- Fish Bay, St. John · 3.9 mi W
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 1.3 ft — Tue Nov 16 · 11:10 AM
Lowest predicted low tide: -0.4 ft — Tue Jan 19 · 11:02 PM
Biggest single-day swing: 1.5 ft on Sat Jul 3
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sat Jun 5 | 1:40 PM | -0.4 ft |
| Fri Jun 4 | 12:55 PM | -0.4 ft |
| Sun Jun 6 | 2:27 PM | -0.4 ft |
| Sat Jul 3 | 12:38 PM | -0.4 ft |
| Sat May 8 | 2:43 PM | -0.4 ft |
| Fri Jul 2 | 11:46 AM | -0.4 ft |
| Sun May 9 | 3:25 PM | -0.3 ft |
| Fri May 7 | 2:05 PM | -0.3 ft |
| Thu Jun 3 | 12:13 PM | -0.3 ft |
| Sun Jul 4 | 1:31 PM | -0.3 ft |
180 minus tides (below 0 ft) are predicted here in 2027. The table shows up to the 10 lowest that fall between 7 AM and 7 PM — the ones worth planning a clam dig or tidepool walk around.
About this station
Johns Folly Bay, St. John Island is one of NOAA's reference tide stations — its predictions are computed directly from harmonic analysis of water levels observed here, and other nearby stations are calculated from it.
Trade-wind shores with small mixed tides — a foot or two in Hawaii, a few feet in the Caribbean — where swell and season matter more than range.