Race Intelligence · Tenby, Pembrokeshire, United Kingdom
Tenby is honest about what it asks. The sea can be demanding, Pembrokeshire roads are hilly, and the marathon returns you again and again to a town that knows how to cheer. There is nowhere to hide an overambitious bike.
Pembrokeshire, the coastal cliffs.
Your day in Tenby
I’m Tom, the coach behind Sense Endurance Coaching. Tell me where you are now and I’ll show you what a strong day in Tenby could look like.
The course behind your race
North Beach gives you open sea before the long run up the zig-zag ramp to transition. After that, the Pembrokeshire roads keep asking for one more climb, and Tenby's walls and seafront draw you back into a town that can make a difficult marathon feel special. This is the earlier course layout; the September 2027 route and date still need confirmation.
Tenby North Beach, previous full swim start
Two loops of open sea off the famous North Beach lead into a genuinely long 1 km run up the 'zig zag' ramp to transition. Settle into rhythm early and don't empty the tank before that run even starts.
Settle by 400 m. Save legs for the zig zag ramp.
Pembrokeshire, opening bike loop
The course moves through the genuinely undulating Pembrokeshire Coast National Park, past castles and landmarks easy to get distracted by. This lap repeats, so ride the rollers at a number you can hold twice.
Cap power on every roller. Fuel on the flatter stretches between them.
Pembrokeshire, closing bike loop one
As loop one closes, hold the same effort you plan for lap two rather than easing up early because the terrain briefly settles.
Stay on the fuelling schedule. Keep power consistent through the closing kilometres.
Pembrokeshire, second bike loop
The second loop repeats the same rolling coastal terrain. Ride to the same power ceiling you set on lap one, especially on the rollers that felt manageable the first time.
Compare effort to lap one. Finish planned nutrition before T2.
Tenby's walls, opening marathon lap
The walls and seafront give Tenby a finish-line atmosphere long before you reach the finish. Enjoy it, but keep your first loop deliberately easier than the crowd wants.
Shorten stride out of T2. Hold opening pace regardless of the noise.
Tenby seafront, marathon lap two
Passing the same walls and beachfront a second time gives a clear read on how loop one's pace is holding after a rolling bike course. Adjust deliberately here.
Compare loop two to loop one. Keep fuelling on schedule.
Tenby's streets, marathon lap three
The third loop is where genuinely undulating bike terrain, ridden twice, starts to show up in the legs. Manage effort rather than chasing a pace that's slipping.
Reassess goal pace honestly. Keep taking aid on schedule.
Tenby's walls, final marathon loop
By the final loop, Tenby's walls and crowds will feel different from the first pass. If you have kept the bike and early run in check, this is the moment to take what is left.
Decide the finish honestly. Save something for the final loop's crowd.
Check the confirmed 2027 race date and course before memorising specific turns. On race week, pay attention to sea conditions at North Beach, the long exit to transition, road closures and where you can eat and drink between climbs. Don't let the crowds decide your opening marathon pace.
A race-day forecast is not meaningful yet; check back closer to the event.
Historical baseline, 2019–2025 · Open-Meteo historical archive · Updated 2026-09-15.Historical comparison only. This is not a forecast for 2027.
Make your finish prediction and I can send this plan to you in race week.
Prepare for Tenby
A finish range gives you something to work towards. The preparation is specific to this race: confidence in open sea, climbing power you can repeat and the patience to run four town laps after a genuinely demanding bike.
I’m Tom. With Sense Endurance Coaching, I’ll build that preparation around your life, follow how you respond and adjust the work as you get closer to Tenby.
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