Mon Sep 14 at Half Moon Bay: high tide at 1:23 AM (4.7 ft) and 1:08 PM (5.6 ft); low tide at 6:58 AM (1.8 ft) and 7:58 PM (0.6 ft) — from NOAA station Pillar Point Harbor, Half Moon Bay #9414131, 6.4 km out.
| Day | Time | Tide | Height |
|---|---|---|---|
| Mon Sep 14 | 1:23 AM | High | 4.7 ft (1.42 m) |
| 6:58 AM | Low | 1.8 ft (0.55 m) | |
| 1:08 PM | High | 5.6 ft (1.72 m) | |
| 7:58 PM | Low | 0.6 ft (0.17 m) | |
| Tue Sep 15 | 2:16 AM | High | 4.2 ft (1.29 m) |
| 7:27 AM | Low | 2.3 ft (0.71 m) | |
| 1:40 PM | High | 5.5 ft (1.67 m) | |
| 8:48 PM | Low | 0.7 ft (0.21 m) | |
| Wed Sep 16 | 3:18 AM | High | 3.8 ft (1.17 m) |
| 7:56 AM | Low | 2.8 ft (0.85 m) | |
| 2:14 PM | High | 5.3 ft (1.60 m) | |
| 9:48 PM | Low | 0.8 ft (0.26 m) | |
| Thu Sep 17 | 4:49 AM | High | 3.6 ft (1.09 m) |
| 8:29 AM | Low | 3.1 ft (0.96 m) | |
| 2:57 PM | High | 5.0 ft (1.54 m) | |
| 11:01 PM | Low | 0.9 ft (0.28 m) | |
| Fri Sep 18 | 6:36 AM | High | 3.6 ft (1.09 m) |
| 9:23 AM | Low | 3.4 ft (1.04 m) | |
| 3:57 PM | High | 4.9 ft (1.48 m) | |
| Sat Sep 19 | 12:11 AM | Low | 0.9 ft (0.26 m) |
| 7:55 AM | High | 3.7 ft (1.14 m) | |
| 11:25 AM | Low | 3.5 ft (1.07 m) | |
| 5:16 PM | High | 4.8 ft (1.47 m) | |
| Sun Sep 20 | 1:11 AM | Low | 0.7 ft (0.22 m) |
| 8:39 AM | High | 4.0 ft (1.20 m) | |
| 12:47 PM | Low | 3.3 ft (1.01 m) | |
| 6:27 PM | High | 4.9 ft (1.49 m) | |
| Mon Sep 21 | 2:02 AM | Low | 0.6 ft (0.17 m) |
| 9:06 AM | High | 4.2 ft (1.27 m) | |
| 1:49 PM | Low | 3.0 ft (0.92 m) | |
| 7:29 PM | High | 5.1 ft (1.54 m) | |
| Tue Sep 22 | 2:44 AM | Low | 0.4 ft (0.12 m) |
| 9:29 AM | High | 4.4 ft (1.35 m) | |
| 2:39 PM | Low | 2.6 ft (0.79 m) | |
| 8:23 PM | High | 5.2 ft (1.60 m) |
Half Moon Bay runs mixed-semidiurnal water: two highs and two lows daily, unequal by ~1.1 ft between successive highs this week. An average swing here this week moves 2.7 ft of water. A 5.1 ft swing — Half Moon Bay's biggest this table — runs from the 1:08 PM high on Mon Sep 14 into the next low. Half Moon Bay tops out at 5.6 ft (Mon Sep 14 1:08 PM) and bottoms at 0.4 ft (Tue Sep 22 2:44 AM).
Half Moon Bay mid-swing times below mark predicted peak flow on its 2.7 ft average cycle (why moving water matters):
Half Moon Bay numbers: NOAA CO-OPS #9414131 (Pillar Point Harbor, Half Moon Bay), 6.4 km off Half Moon Bay center; this open-water pick beat 7 closer-in candidates. Onshore wind or a storm can push real water at Half Moon Bay above the 5.6 ft predicted peak; offshore wind can hold it under. All Half Moon Bay times station-local, refreshed 2026-09-14.
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