Izumi (Isumi)

Izumi is an exposed river-mouth surf spot near Isumi, set up around shifting sandbars at the river exit. Surf can be inconsistent, and both wave direction (lefts and rights) can depend on how the sandbar configuration evolves from day to day. The break is generally exposed, so conditions respond noticeably to wind and swell. Westerly winds are reported to help keep conditions cleaner, but the spot is still subject to fast-changing conditions tied to river flow. After heavy rain, the river can alter the break—so checking the sandbars before committing to a session is especially important. Safety is a major consideration: strong river-mouth currents and rip currents are reported, particularly around outgoing tides. Obstacles can include shifting sandbars and river debris, and larger typhoon-period swells can make the situation messier and heavier due to stronger currents. Seasonally, the most commonly cited surf window for Izumi is late summer into autumn, with best months reported as September through November (with November highlighted as a top month by a surf-forecast source). Typhoon season—typically peaking from September to October—is described as the main period to watch for better swell, while weekend/holiday crowds can also occur at times.