David Flater (who is author of xtide, the program I use to produce this data) provides the following disclaimer, behind which I firmly stand:

Do not rely on the output of this program for decisions that can result in harm to anyone or anything. Really. I mean it.

Agencies like NOAA exist because there is a need for certifiably correct tide predictions. Please do not rely on XTide if you need guaranteed results. There is no way I can get certified data on a zero budget. I rely on users like you to tell me when something is wrong. Please continue to do so.

Click this button to hide this disclaimer. (Requires JavaScript and cookie support in your browser.)

Tidal Heights at Seattle, Puget Sound, Washington

Time Zone is PDTUnits are feet
Tue 01 May00:274.9L05:5410.8H12:39-0.9L19:3711.1H
Wed 02 May01:125.6L06:2610.4H13:13-1.0L20:2011.2H
Thu 03 May01:586.1L07:019.9H13:50-0.9L21:0411.1H
Fri 04 May02:486.5L07:389.3H14:30-0.5L21:5111.0H
Sat 05 May03:466.8L08:218.7H15:130.0L22:4110.8H
Sun 06 May04:576.8L09:138.0H16:010.7L23:3610.7H
Mon 07 MayT06:236.5L10:197.5H16:551.3L
Tue 08 May00:3110.6H07:355.9L11:387.2H17:552.0L
Wed 09 May01:2110.6H08:215.1L12:587.3H18:572.5L
Thu 10 May02:0310.7H08:534.1L14:117.7H19:572.9L
Fri 11 May02:3810.9H09:223.0L15:128.4H20:513.4L
Sat 12 May03:1111.0H09:511.8L16:069.2H21:403.9L
Sun 13 May03:4111.2H10:230.5L16:559.9H22:274.4L
Mon 14 May04:1211.3H10:57-0.7L17:4310.7H23:145.0L
Tue 15 May004:4511.4H11:35-1.8L18:3111.3H
Wed 16 May00:015.5L05:2111.3H12:16-2.5L19:2111.7H
Thu 17 May00:516.0L06:0111.2H13:00-2.9L20:1212.0H
Fri 18 May01:446.4L06:4510.8H13:47-2.9L21:0712.0H
Sat 19 May02:446.6L07:3510.2H14:38-2.4L22:0412.0H
Sun 20 May03:516.5L08:359.5H15:32-1.6L23:0311.8H
Mon 21 MayG05:086.1L09:478.7H16:30-0.5L
Tue 22 May00:0211.8H06:295.3L11:128.1H17:340.7L
Wed 23 May00:5711.7H07:384.1L12:457.9H18:421.9L
Thu 24 May01:4611.7H08:332.7L14:178.2H19:503.0L
Fri 25 May02:2911.6H09:191.4L15:358.9H20:543.9L
Sat 26 May03:0511.5H09:580.3L16:399.6H21:524.7L
Sun 27 May03:3911.3H10:33-0.5L17:3310.3H22:445.4L
Mon 28 May04:1011.1H11:06-1.1L18:1910.8H23:326.0L
Tue 29 May@04:4110.7H11:38-1.5L19:0011.1H
Wed 30 May00:186.4L05:1310.3H12:10-1.6L19:3711.4H
Thu 31 May01:036.7L05:479.9H12:45-1.6L20:1211.5H

QR code: http://www.dairiki.org/tides/monthly.php/sea/2018-05 Available online at

The data in the above table was generated using the program xtide, written by David Flater.
No guarantees as to the correctness of this data are made or implied.
Do not rely on it to make decisions which can result in harm to anyone or anything.

  Support this site. Make a donation!  

Suggestions, questions and comments regarding this page are welcomed.
Here is a form you can use to submit them.
Or, if you have public comments, feel free to add them below.