The Midday Rule - Calculating Spring / Neap Tide for Falmouth, Cornwall

Kayak Hacks

The Midday Rule – Calculating Spring / Neap Tide for Falmouth, Cornwall – a quick reference tool.

Back in my early days coaching for Sea Kayaking Cornwall, Simon Osborne (now of Online Sea Kayaking) introduced me to this brilliant quick reference tool.

Based on Falmouth tide times:

• Low water at midday = Peak Spring Tide

• High water at midday = Peak Neap Tide

This is a fantastic “rule of thumb” when planning a trip. For example, if I see a 10:00 am low water, I know immediately that we are building towards a Spring tide, even without a full tide table or internet access.

There is likely a rule for your local area too (provided it is semi-diurnal). Take a look at your local tide table and see which timings match the peak Springs and Neaps throughout the year.

Check it for yourself here: Falmouth Tide Calendar

Pro Tip: Is it foolproof? Almost! It’s a very reliable indicator for Falmouth, but keep these two things in mind:

1. British Summer Time: Remember that in the summer, the “Midday” rule shifts to 1:00 PM because our clocks have moved forward but the sun (and the tides) haven’t!

2. Weather: A big Atlantic depression (low pressure) can push the water in faster and higher, which can slightly shift these “fixed” timings.

The Bottom Line: Use this rule to get your bearings instantly but always double-check your official tide app or almanac before committing to a long crossing!