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  • Nigel Muir and Sophy Aykroyd

Paddleboarding on the River Thames

Updated: Nov 18, 2022

Everything you need to know about SUP safety on the Thames

Sun shining, no wind, beautiful day – perfect conditions to go paddleboarding on the Thames…. But wait, is there anything else to consider?

There certainly is!

So read on if you want to understand more about safety on the river, particularly during the colder months. If you want to know what kit to pack for a safe trip on the Thames then check out our paddleboarding equipment list.

This article covers the key things our coaches take into account, when they decide whether it’s safe or not to go out on the river and shares some of the apps and resources we use (full list at end of article).

We call it a risk assessment, and every day these factors determine whether a paddleboard session goes ahead, is postponed or even cancelled:

1.Weather – the first thing we do is check the likelihood of rain and thunderstorms, the air and water temperature, and the wind speed and direction.

We use the Dark Sky app for very local weather, Weather Pro for week ahead forecasts and Windy for wind conditions.

Let’s deal with the key factors one at a time:

Rain - It’s actually fun and rather beautiful paddling in the rain, but highly dangerous in thunderstorms where there is a risk of lightning. So definitely check thunderstorm risk and never go out on the water if there’s any likelihood.

Fog, although rare, is also worth avoiding – as visibility on the water is critical for safety. But a little mist adds atmosphere and is fine…

Air temperature – if it’s cold, wrap up warm, remembering a hat and gloves. Carry a drybag for extra layers, or for the layers you remove once you warm up. When you are standing up on a paddleboard you’re exposed to any wind, so remember the effects of wind chill.

Water temperature – the water in the Thames is always pretty cold, averaging 12 degrees, and there’s a real risk of cold water shock even in summer (see this article on cold water shock for more info). Carry extra layers in case you take a dip, avoid cotton clothing, which is really cold when wet, even on warm days, and wear a wetsuit if water temperatures dip below 12 degrees. If you get wet, get those warm layers on quickly before your temperature drops.

Wind speed and direction – at Richmond we are fortunate that the bends in the river generally protect us from the prevailing SW wind, but as you paddle upstream towards Eel Pie island and Twickenham it can be pretty exposed. Generally winds of up to 10mph, gusting up to 20mph, are manageable, although we will paddle in the more sheltered spots in winds of 15mph, gusting to 30mph. Local knowledge is vital here! So look at a map and the wind direction before you go out, so you know what to expect – otherwise you risk going out and not being able to get back to your start point…


Understanding the tide on the Thames is critical for your safety and trip planning.

The Thames is tidal up to Teddington Lock, with two High and Low Tides per day. At Richmond, we are fortunate in that the weir gates at Richmond Lock are lowered to maintain an upstream river depth of 1.7m from two hours before High Tide to two hours after High Tide. This creates an eight-hour Half-Tide window where river conditions are generally safe, with low currents (unless there is high fluvial flow, about which more later). During this time paddle trips can generally be run in either direction on the river between Richmond Lock and Teddington. Below Richmond Lock the river is always tidal, and extreme care needs to be taken during the mid-tide period when flows are strongest.

All our session times at Richmond are determined by the tides, and we schedule these using tide tables provided by the Port of London Authority who control the river up to Teddington

We also use apps like Tides Planner for tides on the day, and Tides Near Me for planning up to a week ahead.

The key thing to consider is whether your paddle trip will be affected by the tides. If paddling near Richmond at half-tide, make sure you’re off the water before Richmond Lock weir gates open as you risk not being able to paddle home against the tide. Similarly, if you go on the water at High Tide, the tide will very soon start to go out, with very fast flows downstream. These can be very difficult to paddle against, with flow rates of up to 8 knots (10mph) which is really fast – and you run a real risk of entanglement in moored boats, low branches and pontoons if you fall in or are swept towards them. If in doubt restrict your paddling to half-tide, or come on one of our High Tide River Skills and Navigation courses to learn more about river safety.

The other thing we consider is Spring Tides, which occur every 14 days around the full Moon and new Moon. This leads to very high tides, often covering the towpath at Richmond – and a far greater volume of water moving on the tides, with higher flow rates and increased level of risk. Spring tides are also significantly stronger than neap tides, and this will affect your ability to paddle against the current.

Also note that very occasionally, when there is high river flow, and tidal surges and big spring tides are forecast, the Thames Barrier may be closed to prevent flooding, often with minimal notice. This will mean that the incoming High Tide only reaches half normal height before starting to ebb, and therefore cannot be relied on to assist you going upstream. We check this on Twitter.

3.Fluvial flow – or land water

This is a key consideration before you go paddling. If there has been heavy rain upriver from Richmond, the flow from land water, known as fluvial flow, can increase dramatically. At high flow levels, even at half-tide, it can be too dangerous to go out on the water. Flow is measured in cubic metres per second, and we take measurements from the Environment Agency’s river gauges at Kingston, the nearest accurate gauge or on Twitter.

We also look at the PLA’s website and app for their Ebb Tide Flag Warnings – which warn of dangers from flow levels on the Ebb Tide:

· Red: Danger, very strong fluvial flow, no paddling on Ebb Tide

· Yellow: Caution, strong fluvial flow, only experienced paddlers exercising caution

· Green: Average fluvial flow, safe conditions

· Black: Low fluvial flow, lower than predicted tides possible, safe conditions


The Environment Agency have a similar system for the river upstream of Teddington

Flow levels below 40 cu.m/sec make for easy paddling. In summer flow is typically around 10 cu.m/sec, and is barely noticeable. Over 80 becomes difficult, and over 120 potentially dangerous and very difficult to paddle against. This week it’s been in the 90-110 range. But with the heavy rain in January and February 2020 we saw flow levels of over 400 cu.m/sec – a raging torrent, and definitely not good for paddling! Remember also the effect of tide on river flow - an incoming tide may neutralise the flow but an outgoing ebb tide will exacerbate it and hugely increase the flow rate and level of risk.

4.Water Quality

Generally the water quality of the Thames at Richmond and above is really good, as evidenced by the huge amount of wildlife – from herons to fish to seals!

But every now and then, after very heavy rain, there can be a sewage discharge from Mogden Sewage Works at Isleworth (and other locations downstream such as Hammersmith). Definitely time to avoid paddling until a couple of tides have cleaned the river up. We check this on Twitter here

Once the Tideway Super Sewer opens in 2025, sewage in the Thames will a thing of the past. We can’t wait!

5.River Traffic

Before we go paddling we check for events and any traffic that may affect us. On summer weekends there is always plenty to think about – hired rowing boats, pilot gigs, rowing sculls and eights, canoes, gin palaces and the passenger boats operated by Turk’s Launches and Colliers (Remember they can’t manoeuvre easily and have no brakes!). We need to ensure that we keep out of the way, stick to starboard (the right-hand side of the river whichever way you are paddling) and maintain a good lookout.

The PLA maintain an events calendar which advises us of regattas or races on the river – anything from sailing races to rowing and kayaking events. The same info is available on their app.

In some cases these can result in a river closure, where no paddling is allowed. For example, the Oxford and Cambridge Boat Race always involves a river closure between Putney and Chiswick, and the Great River Race closes the Thames from Central London up to Eel Pie Island. We check the Notices to Mariners from the PLA for this – they send us an email but you can look here:

For river closure information above Teddington Lock, we check the Environment Agency website here.

6.Route planning

Finally for this blog post, we look at route planning. Before we set off we work out where we intend to paddle, what our turning point will be, any stopping points (the White Swan at Twickenham , The Anglers at Teddington Lock and the London Apprentice in Isleworth are favourites) and what hazards we expect en-route. And we have a back-up plan if weather or traffic conditions in a certain part of the river makes it too difficult to paddle there.

We also make sure we have a good understanding of where we can exit the river if we need to – our access and egress points. There are plenty of steps and slipways along the Thames, but we also consider which of these allow vehicular access should anyone need a taxi home, or, worst case, should an ambulance be required.

On longer trips (further up or down the Thames, or on the coast) we use a tracking app to let our friends and family know where we’re going and what our expected finish time will be. They get alerted and can see our position if we don’t turn up on time. There are plenty of these including WhatsApp location alerts, but we like RYA Safetrx as it includes a number of other useful safety features – link at end of article.

So – plenty to think about before heading out onto the river, even on the sunniest of days. If you’d like to know more, come on one of our High Tide River Skills and Navigation courses.

In part two, we’ll be discussing the other areas of paddleboarding preparation – paddle equipment, safety kit, communications etc.



Dark Sky app:

Not available on Android, but try:

Weather Pro app:

Windy app:

Apple Weather

My Lightning Tracker


Met Office


Tides Planner app:

Tides Near Me app:

Flow rates:

Kingston Gauge Twitter:

Environment Agency Thames river conditions:

PLA Ebb Tide Warning: on homepage of

PLA app:

Water Quality:

Sewage Discharge Twitter:

Sewage Discharge website:

Events and River Closures:

River Closures on the tidal Thames via PLA Notices to Mariners:

River closures upstream of Teddington Lock:

Route planning:

RYA SafeTrx app:

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1 comentario

Greg B
Greg B
15 jul 2021

Thanks for taking the time to lay out all these safety considerations.

Regarding the Tideway Super Sewer, will this effect water quality down in Richmond and beyond? It seems the new sewer doesn't come this far down the Thames.

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