About

I'm Wen. This is the notebook I keep for planning low-tide walks around Singapore: when the good tides are, what each shore is like, and what to look for.

It started as a spreadsheet of tide times with the dawn ones highlighted. Over time it grew into the pages here. I'm not a marine biologist and I'm not affiliated with NParks, MPA or any nature group. For anything official, follow their sites and the guides on the day.

How the tide calendar is made

The calendar is my own calculation. I fitted a standard harmonic tide model (22 tidal constituents) to five years of hourly sea-level readings from the Tanjong Pagar tide gauge, then used it to predict the coming years. To check it, I compared its predictions against years of real readings it hadn't seen:

• low-tide times were typically within 6 to 9 minutes, and almost always within 25 minutes;
• low-tide heights were typically within 4 to 9 cm, and almost always within 25 cm.

Weather, wind and river runoff move the real sea away from any prediction, and the gauge is at one spot in the harbour, so shores elsewhere can turn a little earlier or later. Sunrise and sunset come from the standard NOAA solar formulas. Times are Singapore time (UTC+8).

Sources

• Sea-level data: University of Hawaii Sea Level Center, research-quality hourly data for Tanjong Pagar.
• Official tide predictions: Maritime and Port Authority of Singapore, Singapore Tide Tables.
• Parks, access and guided walks: National Parks Board.
• Weather and lightning: Meteorological Service Singapore.

This site

No ads, trackers or third-party scripts. The pages are static; the only thing that talks to a server is the optional reminder sign-up.