California · Bay
Monterey
Monterey Bay
66.2°F-0.4° vs 24h ago
Above usual October range
Next low tide2:13 AMThu · 0.76 ft MLLW
Observed
San Luis Obispo Bay · Harbor
Port San Luis
Water temperature & tides
WATER TEMPERATURE Station observation
66.9°F
Above usual October range
10th–90th percentile: 57.4°F – 61.9°F · 2021–2025.
Seasonal context, not a failed sensor quality check. Compared with hourly observations in the same UTC calendar month.
Last available observation
66.9°F ·
Historical reading, over 24 hours old. It is excluded from current temperatures and comparisons.
+0.4° compared with 24 hours earlier
COMING UP · LOCAL TIME
Signed heights relative to MLLW; negative values are below the datum. Astronomical tide predictions do not include storm surge.
✓
Official weather alerts shown above. Local water-quality closures are not included. Check local beach authorities.
RECENT OBSERVATIONS
Water temperature
Past 72 hours at Port San Luis. Gaps are left visible.
View observation table
| Local date & time | Water temperature |
|---|---|
| Oct 21 · 8:00 PM PDT | 66.9°F |
| Oct 21 · 7:54 PM PDT | 66.9°F |
| Oct 21 · 7:48 PM PDT | 66.9°F |
| Oct 21 · 7:42 PM PDT | 66.9°F |
| Oct 21 · 7:36 PM PDT | 66.9°F |
| Oct 21 · 7:30 PM PDT | 66.9°F |
| Oct 21 · 7:24 PM PDT | 66.9°F |
| Oct 21 · 7:18 PM PDT | 66.9°F |
| Oct 21 · 7:12 PM PDT | 66.9°F |
| Oct 21 · 7:06 PM PDT | 66.9°F |
| Oct 21 · 7:00 PM PDT | 66.9°F |
| Oct 21 · 6:54 PM PDT | 66.9°F |
| Oct 21 · 6:48 PM PDT | 66.9°F |
| Oct 21 · 6:42 PM PDT | 66.9°F |
| Oct 21 · 6:36 PM PDT | 66.9°F |
| Oct 21 · 6:30 PM PDT | 66.9°F |
| Oct 21 · 6:24 PM PDT | 66.9°F |
| Oct 21 · 6:18 PM PDT | 66.9°F |
| Oct 21 · 6:12 PM PDT | 66.9°F |
| Oct 21 · 6:06 PM PDT | 66.9°F |
| Oct 21 · 6:00 PM PDT | 66.9°F |
| Oct 21 · 5:54 PM PDT | 66.9°F |
| Oct 21 · 5:48 PM PDT | 66.9°F |
| Oct 21 · 5:42 PM PDT | 66.9°F |
| Oct 21 · 5:36 PM PDT | 66.9°F |
| Oct 21 · 5:30 PM PDT | 67.1°F |
| Oct 21 · 5:24 PM PDT | 67.1°F |
| Oct 21 · 5:18 PM PDT | 67.1°F |
| Oct 21 · 5:12 PM PDT | 67.1°F |
| Oct 21 · 5:06 PM PDT | 67.1°F |
| Oct 21 · 5:00 PM PDT | 67.1°F |
| Oct 21 · 4:54 PM PDT | 67.1°F |
| Oct 21 · 4:48 PM PDT | 67.1°F |
| Oct 21 · 4:42 PM PDT | 67.1°F |
| Oct 21 · 4:36 PM PDT | 67.1°F |
| Oct 21 · 4:30 PM PDT | 67.1°F |
| Oct 21 · 4:24 PM PDT | 67.1°F |
| Oct 21 · 4:18 PM PDT | 67.1°F |
| Oct 21 · 4:12 PM PDT | 67.1°F |
| Oct 21 · 4:06 PM PDT | 67.1°F |
| Oct 21 · 4:00 PM PDT | 66.9°F |
| Oct 21 · 3:54 PM PDT | 66.9°F |
| Oct 21 · 3:48 PM PDT | 67.1°F |
| Oct 21 · 3:42 PM PDT | 67.1°F |
| Oct 21 · 3:36 PM PDT | 66.9°F |
| Oct 21 · 3:30 PM PDT | 67.1°F |
| Oct 21 · 3:24 PM PDT | 67.1°F |
| Oct 21 · 3:18 PM PDT | 67.1°F |
| Oct 21 · 3:12 PM PDT | 67.1°F |
| Oct 21 · 3:06 PM PDT | 67.1°F |
| Oct 21 · 3:00 PM PDT | 67.1°F |
| Oct 21 · 2:54 PM PDT | 67.1°F |
| Oct 21 · 2:48 PM PDT | 66.9°F |
| Oct 21 · 2:42 PM PDT | 66.9°F |
| Oct 21 · 2:36 PM PDT | 66.9°F |
| Oct 21 · 2:30 PM PDT | 66.9°F |
| Oct 21 · 2:24 PM PDT | 66.9°F |
| Oct 21 · 2:18 PM PDT | 66.9°F |
| Oct 21 · 2:12 PM PDT | 66.9°F |
| Oct 21 · 2:06 PM PDT | 66.9°F |
| Oct 21 · 2:00 PM PDT | 66.9°F |
| Oct 21 · 1:54 PM PDT | 66.9°F |
| Oct 21 · 1:48 PM PDT | 66.9°F |
| Oct 21 · 1:42 PM PDT | 66.9°F |
| Oct 21 · 1:36 PM PDT | 66.9°F |
| Oct 21 · 1:30 PM PDT | 66.9°F |
| Oct 21 · 1:24 PM PDT | 66.9°F |
| Oct 21 · 1:18 PM PDT | 66.9°F |
| Oct 21 · 1:12 PM PDT | 66.9°F |
| Oct 21 · 1:06 PM PDT | 66.9°F |
| Oct 21 · 1:00 PM PDT | 66.7°F |
| Oct 21 · 12:54 PM PDT | 66.7°F |
| Oct 21 · 12:48 PM PDT | 66.7°F |
| Oct 21 · 12:42 PM PDT | 66.7°F |
| Oct 21 · 12:36 PM PDT | 66.7°F |
| Oct 21 · 12:30 PM PDT | 66.7°F |
| Oct 21 · 12:24 PM PDT | 66.7°F |
| Oct 21 · 12:18 PM PDT | 66.7°F |
| Oct 21 · 12:12 PM PDT | 66.7°F |
| Oct 21 · 12:06 PM PDT | 66.7°F |
| Oct 21 · 12:00 PM PDT | 66.7°F |
| Oct 21 · 11:54 AM PDT | 66.7°F |
| Oct 21 · 11:48 AM PDT | 66.7°F |
| Oct 21 · 11:42 AM PDT | 66.7°F |
| Oct 21 · 11:36 AM PDT | 66.7°F |
| Oct 21 · 11:30 AM PDT | 66.7°F |
| Oct 21 · 11:24 AM PDT | 66.7°F |
| Oct 21 · 11:18 AM PDT | 66.7°F |
| Oct 21 · 11:12 AM PDT | 66.7°F |
| Oct 21 · 11:06 AM PDT | 66.7°F |
| Oct 21 · 11:00 AM PDT | 66.7°F |
| Oct 21 · 10:54 AM PDT | 66.7°F |
| Oct 21 · 10:48 AM PDT | 66.7°F |
| Oct 21 · 10:42 AM PDT | 66.7°F |
| Oct 21 · 10:36 AM PDT | 66.7°F |
| Oct 21 · 10:30 AM PDT | 66.7°F |
| Oct 21 · 10:24 AM PDT | 66.7°F |
| Oct 21 · 10:18 AM PDT | 66.7°F |
| Oct 21 · 10:12 AM PDT | 66.7°F |
| Oct 21 · 10:06 AM PDT | 66.7°F |
| Oct 21 · 10:00 AM PDT | 66.7°F |
| Oct 21 · 9:54 AM PDT | 66.7°F |
| Oct 21 · 9:48 AM PDT | 66.7°F |
| Oct 21 · 9:42 AM PDT | 66.7°F |
| Oct 21 · 9:36 AM PDT | 66.7°F |
| Oct 21 · 9:30 AM PDT | 66.7°F |
| Oct 21 · 9:24 AM PDT | 66.7°F |
| Oct 21 · 9:18 AM PDT | 66.7°F |
| Oct 21 · 9:12 AM PDT | 66.7°F |
| Oct 21 · 9:06 AM PDT | 66.7°F |
| Oct 21 · 9:00 AM PDT | 66.7°F |
| Oct 21 · 8:54 AM PDT | 66.7°F |
| Oct 21 · 8:48 AM PDT | 66.7°F |
| Oct 21 · 8:42 AM PDT | 66.7°F |
| Oct 21 · 8:36 AM PDT | 66.7°F |
| Oct 21 · 8:30 AM PDT | 66.7°F |
| Oct 21 · 8:24 AM PDT | 66.7°F |
| Oct 21 · 8:18 AM PDT | 66.7°F |
| Oct 21 · 8:12 AM PDT | 66.7°F |
| Oct 21 · 8:06 AM PDT | 66.7°F |
Latest 120 observations shown in this table.
OFFICIAL ASTRONOMICAL PREDICTIONS
Tides for October 21
NOAA prediction DaylightTimes in America/Los_Angeles
| Date | Event | Local time | Height |
|---|---|---|---|
| Wed, Oct 21 | ↘ Low | 1:19 AM PDT | 0.69 ft |
| ↗ High | 8:02 AM PDT | 4.54 ft | |
| ↘ Low | 1:45 PM PDT | 2.21 ft | |
| ↗ High | 7:23 PM PDT | 4.47 ft | |
| Thu, Oct 22 | ↘ Low | 1:50 AM PDT | 0.78 ft |
| ↗ High | 8:21 AM PDT | 4.88 ft | |
| ↘ Low | 2:24 PM PDT | 1.61 ft | |
| ↗ High | 8:13 PM PDT | 4.53 ft | |
| Fri, Oct 23 | ↘ Low | 2:19 AM PDT | 0.96 ft |
| ↗ High | 8:41 AM PDT | 5.27 ft | |
| ↘ Low | 3:02 PM PDT | 0.99 ft | |
| ↗ High | 9:01 PM PDT | 4.54 ft | |
| Sat, Oct 24 | ↘ Low | 2:48 AM PDT | 1.22 ft |
| ↗ High | 9:04 AM PDT | 5.68 ft | |
| ↘ Low | 3:42 PM PDT | 0.40 ft | |
| ↗ High | 9:49 PM PDT | 4.48 ft | |
| Sun, Oct 25 | ↘ Low | 3:17 AM PDT | 1.56 ft |
| ↗ High | 9:30 AM PDT | 6.06 ft | |
| ↘ Low | 4:24 PM PDT | -0.12 ft | |
| ↗ High | 10:40 PM PDT | 4.36 ft | |
| Mon, Oct 26 | ↘ Low | 3:48 AM PDT | 1.93 ft |
| ↗ High | 10:01 AM PDT | 6.36 ft | |
| ↘ Low | 5:09 PM PDT | -0.52 ft | |
| ↗ High | 11:36 PM PDT | 4.18 ft | |
| Tue, Oct 27 | ↘ Low | 4:21 AM PDT | 2.30 ft |
| ↗ High | 10:36 AM PDT | 6.52 ft | |
| ↘ Low | 5:59 PM PDT | -0.74 ft |
A LITTLE LONGER VIEW
Seasonal water temperatures
NOAA station observations · 2021–2025 baseline. Each published month has at least three qualifying years.
| Month | Mean | 10th–90th percentile | Years used |
|---|---|---|---|
| Jan | 55.6°F | 53.4°F – 57.6°F | 2021, 2022, 2023, 2024, 2025 |
| Feb | 55.1°F | 52.5°F – 58.1°F | 2021, 2022, 2023, 2024, 2025 |
| Mar | 54.2°F | 52.0°F – 56.5°F | 2021, 2022, 2023, 2024, 2025 |
| Apr | 53.3°F | 51.3°F – 55.6°F | 2021, 2022, 2023, 2024, 2025 |
| May | 54.6°F | 52.0°F – 57.2°F | 2021, 2022, 2023, 2024, 2025 |
| Jun | 57.3°F | 54.7°F – 59.9°F | 2021, 2022, 2023, 2024, 2025 |
| Jul | 58.7°F | 56.1°F – 61.3°F | 2021, 2022, 2023, 2024, 2025 |
| Aug | 60.1°F | 57.4°F – 63.0°F | 2021, 2022, 2023, 2024, 2025 |
| Sep | 60.6°F | 58.6°F – 62.6°F | 2021, 2022, 2023, 2024, 2025 |
| Oct | 59.4°F | 57.4°F – 61.9°F | 2021, 2022, 2023, 2024, 2025 |
| Nov | 57.2°F | 54.3°F – 59.9°F | 2021, 2022, 2023, 2024, 2025 |
| Dec | 57.4°F | 55.2°F – 60.1°F | 2021, 2022, 2023, 2024, 2025 |
All 12 months are shown. “Insufficient data” means fewer than three years meet 70% hourly coverage for that calendar month. Winter months use the same coverage rules; they are not deliberately excluded.
Hourly UTC observations, at least 70% coverage per station-month-year and at least three qualifying years per calendar month; 10th–90th percentiles of qualifying hourly observations.
BEHIND THE NUMBER
Know where your reading comes from.
A station observation at Port San Luis. Use its tide predictions to plan the date and time of a coastal visit.
- Monitoring station
- Port San Luis · NOAA 9412110
- Coordinates
- 35.16889, -120.75417
- Water body
- San Luis Obispo Bay
- Source relationship
- Official NOAA station location; observation applies to the named sensor.
- Last successful collection
- Oct 21, 2026 · 8:10 PM PDT
- Tide reference
- MLLW · Mean Lower Low Water
To report an issue, include the station ID, observation time and source link when contacting the site operator. Read our methodology.
A LITTLE FARTHER ALONG
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72.1°F-0.7° vs 24h ago
Above usual October range
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—°F
More observations are needed to draw this chart.
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