Mainside (Yomitan)
- Shortboard, Advanced riders
- Best for
- Intermediate to Advanced
- Skill Level
- Ocean
- Spot Type
- Busy
- Crowd Level
This spot information is AI-assisted and has not been human verified. It may be incomplete, outdated, or incorrect. Verify safety, access, local rules, and current conditions with official or local sources before riding.
About
Mainside (Yomitan) is an exposed reef break where the surf is strongly dependent on timing. The launch area involves working over a reef with shallow water that can become dangerously low as the tide drops, so the safest window is closely tied to high tide. In winter, the spot is typically most consistent, with offshore east-southeast winds helping the wave hold shape. The break is known for a strong right-hand option, and when conditions line up it can feel quite reliable for reef surfing rather than a casual beach-style setup. Hazards are a major part of the spot’s character: sharp coral/reef surface features, sea urchins, and the possibility of rips are repeatedly highlighted, along with occasional shark concerns. Larger swell can bring heavy, challenging conditions with wash-throughs, so experience and careful session planning matter. When it’s working, it can also become crowded. Respectful local rotation is recommended, and because there’s no dedicated beach-side rescue/lifeguarding, surfers should plan assuming self-rescue capability and have the right protective gear (notably reef-protection boots).
- Reliable exposed reef surf in winter with offshore east-southeast winds
- Right-hand wave is often the better side
- Strong tide dependence (high tide window)
- Exposed reef break with reliable winter surf when the tide and winds are right
- Offshore east-southeast winds in winter can help groom the wave
- Right-hand section is often the better side of the break
- Reef hazards (sharp coral/sea urchins) and strong currents can make it challenging
- Very tide dependent—can be dangerous at low tide
- Can get crowded when conditions are good
- No dedicated rescue/lifeguards
Wind, water and seasons
Wind
- Direction
- E, ESE, SE
- Offshore directions
- ESE
- Wind Range
- 10–20 kts
- Wind Type
- Mixed — Offshore east-southeast winds in winter; can include easterly and southerly components depending on the day and direction.
- Reliability
- fair
- Gust Factor
- Moderate gusts
- Best Months
- December, January, February, March, October, November
Water & beach
- Water Type
- Ocean
- Beach
- Reef — Sources conflict on composition (reef vs rocks); bottom is reef with sharp coral.
- Beach Size
- Small
- Waves
- Medium
- Launch
- Medium — Reef break launch with exposed shoreline; access can involve descending from a seawall and/or walking across reef flat at mid-to-high tide.
- Launch Difficulty
- Difficult — Access and entry can be difficult due to reef shallows and the seawall/rocky shoreline; overall difficulty rated moderate to difficult depending on conditions and tide.
Through the year
Rainy season is typically May to June; typhoon season is July to October.
By sport
What to expect for each.
An exposed reef break on Yomitan with a strong right-hand option and a tide-dependent window. It can offer a reliable reef setup in winter, but the reef is shallow over rock and becomes hazardous quickly as the tide drops.
- Wave Direction
- Right
- Optimal Swell
- N, NW
- Swell Height
- 1–2 m
- Optimal Tide
- High — Works best around high tide; typically only for a few hours around the high-tide window.
- Shelter
- Exposed — Open/exposed shoreline with little protection; conditions are sensitive to swell and wind.
- Wind Effect
- Best with east-southeast offshore winds; easterly flow can groom the wave, while other wind directions can blow it out.
- Bigger Swell
- Can get heavy and challenging on larger swells, including wash-throughs during typhoon swells.
- Wave Quality
- Good
- Wave Power
- Moderate — Rated as reliable but exposed; can become challenging on larger swells.
- Wave Shape
- Peeling
- Peel Speed
- Medium
- Ride Length
- Short — Sources conflict on ride length; typically short to medium depending on conditions and tide.
- Typical Ride Length
- 50–100 m
- Ride Length Details
- The right-hand reef break is the better side; left-hand waves are generally less favored when comparing the two directions.
Check the forecast before you go
See wind, waves, weather and session windows for Mainside (Yomitan) in the full forecast view.
Mainside (Yomitan) wind and wave forecast summary
- Wind
- 6–22 ktsGusts 38 kts
- Direction
- NNE31°
- Strongest day
- Sat, Oct 2422 kts
- Windy days
- 5/712 kts or more
- Waves
- 0.6–3.2 m7s period
- Temperature
- 23–29 °C
Over the next 7 days, Mainside (Yomitan) is forecast for daytime winds of 6–22 kts, peaking around 22 kts on Saturday, October 24 with gusts to 38 kts. The prevailing direction is NNE. Waves run 0.6–3.2 m with a period of about 7s. Based on the Wavind model, in the spot’s local time.
Other spots in the area
What to know before you launch
Safety, access, restrictions, rescue, and local rules can change. Treat these details as informational and confirm them locally before launching.
Hazards
- Rips
- Sharp coral
- Coral
- Sea urchins
- Sharks
- Shallow reef at low tide
Rescue & support
- Rescue & Self-Rescue
- Limited — No dedicated beach-side rescue confirmed for these rocky launches; emergency responders via Japan Coast Guard are available.
- Emergency Info
- Emergency services: 119. Japan Coast Guard emergency number 118 is available; no dedicated beach-side rescue is confirmed for these specific rocky launches.
- Localism / Vibe
- Moderate
Rules of the spot
Surf only in the safe tide window; respect local surfer rotation when conditions are working.
- Tide-restricted: do not surf at low tide due to exposed reef
- The reef is very tide dependent—surfing works best around high tide.
- Check tide charts carefully; the reef becomes dangerously shallow very quickly as the tide drops.
- The right-hand reef break is better than the left when it’s working.
- Expect crowds when it’s working well.
Getting there & access
- Nearest City
- Yomitan
- Local Language
- Japanese
What's on the beach
- Accommodation
- Nearby town — Various hotels and guesthouses are available in Yomitan and nearby Chatan.
- Food & Drink
- Convenience stores and local cafes are located a short drive away in Yomitan.
No schools or services are listed for this spot yet.
From riders who've been here
Latest reported conditions
Spot questions
Frequently asked questions
When is the best season at Mainside (Yomitan)?
The best overall months at Mainside (Yomitan) are October, November, December, January, February, March. The best wind months are December, January, February, March, October, November.
Which wind directions work at Mainside (Yomitan)?
Mainside (Yomitan) works with E, ESE, SE winds. Offshore directions are ESE.
What skill level is Mainside (Yomitan) suitable for?
Mainside (Yomitan) suits these riding levels: Surfing: Intermediate to Advanced.