Tyoushi River Mouth (Kihoku)

Tyoushi River Mouth (Kihoku) is a rocky rivermouth surfing break known for clear, high-quality waves and a powerful right-hander. It works best with a south to southwest swell, and the wave can hold to large swell sizes (up to about 4m+). On suitable days, riders can get medium ride lengths, with good-day sessions described around 50 to 150 meters. Wind expectations are tightly linked to north winds: north winds are described as offshore, but overall wind reliability is considered low. The spot’s exposure and the rivermouth setting mean conditions can change quickly, and the river outflow can create significant currents. Safety considerations are a major part of planning here. The bottom is rocky with large rocks and boulders, and the river outflow can produce strong rip currents depending on swell size. Localism is also reported as moderate, and the spot can be sensitive to overcrowding. For timing, weekdays are generally quieter (often empty), while weekends may bring more surfers. Winter-to-early-spring months (December through February) are highlighted for wind, and the spot’s water temperature varies strongly through the year—from around the mid-teens in winter to the upper-20s in late summer. Gear planning is important, with wetsuit and boot recommendations varying by season.