West Coast
Korths Harbor
San Joaquin River · California · NOAA station 9415229 · Tide predictions
38.0976, -121.5684
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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
San Francisco Bar, CA (142) buoy · 62 mi W · Station 46237
Wind & wave reports →
Nearby tide stations
- Georgiana Slough entrance · 2.0 mi N
- Prisoners Point · 2.6 mi S
- Terminous, South Fork · 3.9 mi E
- Irish Landing, Sand Mound Slough · 4.5 mi S
- Wards Island, Little Connection Slough · 5.1 mi SE
Plan ahead
2027 tide extremes for this station
Highest predicted high tide: 4.3 ft — Sat Jul 3 · 4:14 AM
Lowest predicted low tide: -0.6 ft — Thu Dec 16 · 1:07 AM
Biggest single-day swing: 4.7 ft on Sun Jul 4
Best daytime minus tides of 2027
| Date | Low tide | Height |
|---|---|---|
| Sun Jun 6 | 1:45 PM | -0.6 ft |
| Sat Jun 5 | 12:56 PM | -0.5 ft |
| Mon Jun 7 | 2:33 PM | -0.5 ft |
| Sat May 8 | 2:01 PM | -0.5 ft |
| Fri May 7 | 1:11 PM | -0.5 ft |
| Sun May 9 | 2:52 PM | -0.5 ft |
| Fri Jun 4 | 12:07 PM | -0.5 ft |
| Thu May 6 | 12:22 PM | -0.5 ft |
| Mon May 10 | 3:45 PM | -0.5 ft |
| Tue Jun 8 | 3:20 PM | -0.4 ft |
162 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
Korths Harbor, San Joaquin River 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.
Mixed semidiurnal tides — two unequal highs and two unequal lows a day — with ranges growing as you head north. Harbor entrances feel the swell as much as the tide.