Friday Harbor, San Juan Island, WA tide times
NOAA tide prediction station 9449880, 48.5453° N, 123.0125° W. Heights in feet above MLLW.
Today at Friday Harbor, San Juan Island, WA
Today's predicted high and low waters, sunrise and sunset for Friday Harbor, San Juan Island, WA load here from NOAA. Without JavaScript they cannot be shown: NOAA's own table for station 9449880 is at tidesandcurrents.noaa.gov. Everything else on this page is measured and does not change from day to day.
What the tide does at Friday Harbor, San Juan Island, WA
Across the 1271 high and low waters NOAA predicts here for 2027, high water averages 7.21 ft above MLLW and low water 2.21 ft — a mean range of 5 ft. Taking each day's higher high and lower low, which is the swing someone standing on the shore actually sees, the average is 7.82 ft.
On 75% of days in 2027 there are two high waters and on the remaining 85 days only one. Where there are two, they differ in height by 1.35 ft on average. Successive high waters are 13h 47m apart on average.
The largest daily swing of 2027 is 11.91 ft on 6 June 2027 and the smallest is 1.26 ft on 16 November 2027 , a factor of 9.5 between the biggest spring tide and the smallest neap.
Measured figures
| Mean high water | 7.21 ft above MLLW |
|---|---|
| Mean low water | 2.21 ft above MLLW |
| Mean range | 5 ft |
| Mean great diurnal range | 7.82 ft |
| Largest daily range in 2027 | 11.91 ft on 6 June 2027 |
| Smallest daily range in 2027 | 1.26 ft on 16 November 2027 |
| Highest predicted tide | 9.06 ft at 7:48 AM on 15 December 2027 |
| Lowest predicted tide | -3.36 ft at 11:29 AM on 4 July 2027 |
| Average gap between high waters | 13h 47m |
| Tidal pattern | mixed (1.74 high waters a day) |
| Position | 48.5453° N, 123.0125° W |
| NOAA station id | 9449880 |
Every figure above is computed from NOAA's published predictions for station 9449880 for the whole of 2027 (365 days, 1271 tides), not from a regional average or an estimate.
What MLLW means here
Every height on this page is feet above MLLW — mean lower low water, the chart datum NOAA publishes tide predictions against. It is the average of the lower of each day's low waters, taken over a 19-year period, so zero here is neither the sea bed nor the average sea level: it is a level the water drops below regularly. At Friday Harbor, San Juan Island, WA, 196 of the 635 low waters predicted for 2027 — 31% of them — fall below zero, the lowest being -3.36 ft on 4 July 2027.
Practically: a chart showing 6 ft of water here means about 6 ft at a mean lower low water and about 13.8 ft at a mean higher high. Add the predicted height for the moment you care about to the charted depth.
Where these predictions come from
This is a reference station: NOAA computes its predictions directly, from a harmonic analysis of water levels measured at this location, rather than by offsetting another station's table.
Daylight at this latitude
Friday Harbor, San Juan Island, WA sits at 48.5453° N. The longest day of 2027 here is 16h 08m of daylight on 21 June 2027; the shortest is 8h 17m on 21 December 2027 — a difference of 7h 51m.
Day lengths are computed with NOAA's published solar algorithm from the station's latitude and longitude. Clock times for sunrise and sunset are deliberately not printed here: they depend on the station's UTC offset, and this site takes that offset from NOAA's own answers rather than from a timezone table — so it is the live panel above, which has them, that shows the times.
Nearest other stations
- Orcas, Orcas Island, WA 7.6 km (4.7 miles)
- Shaw Island, Ferry Terminal, Harney Channel, WA 7.6 km (4.7 miles)
- Kanaka Bay, San Juan Island, WA 8.5 km (5.3 miles)
- Upright Head, Lopez Island, WA 9.8 km (6.1 miles)
- Hanbury Point, Mosquito Pass, San Juan I., WA 12 km (7.6 miles)
- Roche Harbor, San Juan Island, WA 13 km (7.9 miles)
Put these tides on your own site
One line of HTML shows today's tides for Friday Harbor, San Juan Island, WA on any page:
<script src="https://tidedata.romermade.com/v1/embed.js" data-station="9449880" defer></script>No account, no key, no build step. How it works.