London's tidal River Thames is one of the most iconic waterways in the world — and one of the most dynamic. Unlike ocean coastlines, the Thames experiences powerful semidiurnal tides that push saltwater deep into the heart of the city twice a day. Whether you're planning a riverside walk, a kayaking trip, or simply curious about why the foreshore keeps appearing and disappearing, this guide will help you understand London's tides in 2026.
Overview of London Tides
The Thames at London Bridge experiences a tidal range of approximately 6–7 metres at spring tides — one of the largest in the UK. This means the river can rise or fall by the height of a two-storey building within just six hours. The tidal influence extends roughly 100 km inland to Teddington Lock, the official tidal limit of the Thames.
London's tides are semidiurnal, meaning two high tides and two low tides occur approximately every 24 hours and 50 minutes. Due to the shape of the Thames estuary, high water at London Bridge arrives around 1 hour and 20 minutes after high water at Southend-on-Sea, creating a staggered progression upriver.
How to Read the London Tide Table
Reading a tide table for London is straightforward once you understand the key columns:
| Column | Meaning |
|---|---|
| Date | Day and month |
| High Water Time (HW) | Time of high tide (GMT or BST) |
| High Water Height (m) | Water level at high tide above Chart Datum |
| Low Water Time (LW) | Time of low tide |
| Low Water Height (m) | Water level at low tide above Chart Datum |
GMT vs BST
Always check whether the table is in Greenwich Mean Time (GMT) or British Summer Time (BST). Between late March and late October, the UK observes BST (GMT+1), so you must add 1 hour to GMT-based tables.
In 2026, BST begins on 29 March and ends on 25 October.
Spring and Neap Tides in London
Not all tides are equal. Tidal strength in London follows the lunar cycle:
- Spring tides (around new and full moon): The largest tidal ranges, often exceeding 6.5 m. The foreshore becomes very exposed at low water, revealing centuries of history.
- Neap tides (around first and last quarter moon): Smaller ranges, typically 4–5 m. The river changes less dramatically and currents are weaker.
In 2026, some of the largest spring tides will occur in February and September, when the moon is at perigee (closest to Earth) during a full or new moon.
Best Times to Visit the Thames Foreshore
London's mudlarking community — people who search the Thames foreshore for historical artefacts — live and breathe the tide table. The best times to visit the foreshore are:
- 1–2 hours after high water begins to fall, when the foreshore starts to expose itself
- At low water during spring tides, when the maximum amount of foreshore is accessible
- Early mornings on weekdays, when the foreshore is less crowded
⚠️ Always check with the Port of London Authority (PLA) before accessing the foreshore. Some sections require permits.
Water Activities on the Thames in 2026
The Thames hosts an enormous variety of water sports, all governed by the tides:
Kayaking and Paddleboarding
The safest windows are 2 hours either side of high water, when tidal flow is at its weakest (slack water). Avoid paddling on a strong ebb tide, which can reach 4–5 knots under London Bridge and sweep inexperienced paddlers toward the estuary.
River Swimming
Wild swimming in the Thames is officially permitted in certain sections above Teddington Lock. Below Teddington, the combination of tidal currents, cold water, and river traffic makes swimming extremely hazardous for most people.
Rowing and Sailing
The Thames Tideway is one of the busiest stretches of river in Europe. Rowers from clubs between Putney and Mortlake typically favour the flood tide (rising tide) for heading upstream and the ebb tide (falling tide) for heading downstream.
Curious Facts About London's Tides
- The Thames Barrier near Woolwich was completed in 1982 to protect London from tidal storm surges. In 2026, it is expected to close dozens of times to prevent flooding.
- During extreme low tides, the old wooden piers from Roman and medieval London can sometimes be seen near Blackfriars Bridge — the city's tidal history made literally visible.
- The word "estuary" comes from the Latin aestuarium, meaning "tidal inlet" — a fitting description of the lower Thames.
- Low tide in London exposes around 45 km² of foreshore, the largest intertidal zone of any major European capital.
Planning Your Visit Around the Tides
| Activity | Best Tide Condition |
|---|---|
| Mudlarking / foreshore exploring | Low water, spring tides |
| Kayaking / paddleboarding | 2 hrs either side of high water |
| Riverside walking (Embankment) | Any — Embankment is always accessible |
| Boat trips | High water or flood tide |
| Photography of exposed foreshore | Low water, golden hour |
Check the Live Tide Table for London at MaréAgora
Stay ahead of the Thames tides every day of 2026. Check the live tide table for London at MaréAgora for real-time predictions, moon phase data, and sunrise/sunset times — all in one place. Whether you're a mudlarker, a kayaker, or simply someone who loves the river, accurate tidal data is your most important tool.
Tidal data for the River Thames is provided by the Port of London Authority and the UK National Tide Gauge Network. All times should be verified against official sources before undertaking any water activity.