Experience the thrill of the One on the River - Henley Triathlon, set to take place on September 20, 2026, along the picturesque banks of Henley-on-Thames. This challenging and scenic race invites triathletes from around the globe to test their endurance against a unique course that showcases some of England's most beautiful landscapes. The event kicks off with an exhilarating swim in the river itself, offering participants the chance to cool down under clear skies as they navigate through calm waters surrounded by lush greenery. Following the swim, athletes transition to the cycling leg, where they will pedal along scenic routes lined with ancient trees and rolling hills that provide a mix of flat terrain and challenging climbs. The final stretch is an invigorating run that winds its way through historic Henley-on-Thames, taking runners past charming cobblestone streets and iconic landmarks. The race concludes in the heart of this quaint town where spectators gather to cheer on competitors as they cross the finish line. Whether you are a seasoned triathlete or new to the sport, the One on the River - Henley Triathlon promises an unforgettable experience with its picturesque setting and challenging course. For those looking for more than just competition, the event also includes pre-race training sessions and post-event celebrations that allow participants to connect with fellow athletes and explore all that Henley-on-Thames has to offer. Don't miss your chance to be a part of this unique triathlon experience in one of England's most charming locations. Join us on September 20, 2026, for the One on the River - Henley Triathlon and immerse yourself in a day filled with athletic challenge and scenic beauty.
Races Offered
Aquabike - Middle
Sep 20, 2026
straighten
Distance —
Aquabike - Middle
terrain
Type —
Multisports
timer
7 days remaining
sell
£85.40
Aquabike - Sprint
Sep 20, 2026
straighten
Distance —
0.8K Swim 20K Bike
terrain
Type —
Multisports
timer
7 days remaining
sell
£64.05
Aquabike - Standard
Sep 20, 2026
straighten
Distance —
Aquabike - Standard
terrain
Type —
Multisports
timer
7 days remaining
sell
£69.38
Swim - 1500m
Sep 20, 2026
straighten
Distance —
1.5K
terrain
Type —
Multisports
timer
7 days remaining
sell
£32.02
Swim - 3000m
Sep 20, 2026
straighten
Distance —
3K
terrain
Type —
Multisports
timer
7 days remaining
sell
£42.70
Swim - 750m
Sep 20, 2026
straighten
Distance —
0.8K
terrain
Type —
Multisports
timer
7 days remaining
sell
£26.68
Triathlon - Middle
Sep 20, 2026
straighten
Distance —
Triathlon - Middle
terrain
Type —
Multisports
timer
7 days remaining
sell
£117.42
Triathlon - Sprint
Sep 20, 2026
straighten
Distance —
0.8K Swim 20K Bike 5K Run
terrain
Type —
Multisports
timer
7 days remaining
sell
£74.72
Triathlon - Standard
Sep 20, 2026
straighten
Distance —
Triathlon - Standard
terrain
Type —
Multisports
timer
7 days remaining
sell
£85.40
Weather History
These values represent the 3-year monthly averages for September in Henley-on-Thames.
thermostatTemperature
11.4° / 19.3°
wb_sunnyFeels like
9.1° / 17.0°
light_mode
Avg sunshine hours
8h 26m
water_drop
Avg rainfall
3.4 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
14.0 km/h (Gentle breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (3.5)
humidity_mid
Humidity
79.7%
wb_twilight
Sunrise
06:38
nightlight
Sunset
19:15
Hotels & Places to Stay
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