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Map of Yonaguni Monument (Iseki Point)
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Yonaguni Monument (Iseki Point)

Yonaguni, JapanDirections
Rash guard or 2mm shorty typical

Yonaguni Monument (Iseki Point) at a glance

Yonaguni Monument (Iseki Point) is a dive site in Yonaguni, Japan. Typically most favorable Sep · from 3 years of archive data. Recent reports put the water around 28°C (82°F). Check the latest conditions and entry details before you go.

No window today· next: Thu 7:00–19:00 · favorable & moderate

Forecast for this hour · 23:00 · run 21 h ago
2.0 m (6.5 ft)waves — about two meters expected (waves — about seven feet expected)

Tap a factor for its source and model point · Forecast 28°C · seasonal avg 29°C ( · Forecast 82°F · seasonal avg 84°F)

Dive windows this week

Smallest waves: Fri
MonNo window

2.1 m waves · 15 kn wind (7.0 ft waves · 15 kn wind)

TueNo window

2.1 m waves · 19 kn wind (6.9 ft waves · 19 kn wind)

WedNo window

2.7 m waves · 21 kn wind (8.8 ft waves · 21 kn wind)

Thu7:00–10:00 moderate, 10:00–19:00 favorable

1.6 m waves · 9 kn wind (5.1 ft waves · 9 kn wind)

Fri7:00–19:00 favorable

1.1 m waves · 12 kn wind (3.4 ft waves · 12 kn wind)

Sat7:00–13:00 moderate, 13:00–19:00 favorable

1.4 m waves · 15 kn wind (4.6 ft waves · 15 kn wind)

Sun7:00–19:00 favorable

1.2 m waves · 7 kn wind (3.9 ft waves · 7 kn wind)

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 6:27 · Sunrise 6:51 · Sunset 18:12 · some windows run past sunset

Source: Open-Meteo marine · model point 8.6 km from site · updated 26 Oct, 02:26 GMT+9

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Yonaguni Monument (Iseki Point)

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 18% of days have historically been favorable, water has typically been 24°C (75°F), waves have typically been 2.5 m (8.1 ft), wind has typically been 21 knots
  2. February, 12% of days have historically been favorable, water has typically been 24°C (74°F), waves have typically been 2.4 m (7.9 ft), wind has typically been 21 knots
  3. March, 30% of days have historically been favorable, water has typically been 24°C (75°F), waves have typically been 2.0 m (6.6 ft), wind has typically been 20 knots
  4. April, 47% of days have historically been favorable, water has typically been 26°C (79°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 18 knots
  5. May, 56% of days have historically been favorable, water has typically been 27°C (81°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 18 knots
  6. June, 58% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.4 m (4.5 ft), wind has typically been 17 knots
  7. July, 49% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 19 knots
  8. August, 73% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.3 m (4.3 ft), wind has typically been 13 knots
  9. September, 76% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.5 m (4.8 ft), wind has typically been 15 knots, historically most favorable
  10. October, 34% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 2.4 m (7.8 ft), wind has typically been 19 knots
  11. November, 19% of days have historically been favorable, water has typically been 27°C (81°F), waves have typically been 2.5 m (8.3 ft), wind has typically been 22 knots
  12. December, 13% of days have historically been favorable, water has typically been 26°C (78°F), waves have typically been 2.6 m (8.7 ft), wind has typically been 23 knots

September has typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life recorded at this site, by month

Recorded observations — evidence of past sightings, not a promise of what you’ll encounter.

  • Sphyrna zygaena recorded here Apr (1 record)

    most recent 2013

Newest record here: 2013. Counts are occurrence records near this site from public biodiversity datasets (GBIF), grouped by calendar month across all sampled years. Sightings vary — past records are context, not a prediction.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated July 2026

Site details

No description for this site yet — divers who know it can suggest one below.

boatdriftreefwall

No hazards recorded for this site yet — that never means there are none. Ask a local operator before you dive.

Reviews

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