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Mariner's Cave

TongaDirections
3mm wetsuit typical

Mariner's Cave at a glance

Mariner's Cave is a dive site in Tonga. Typically most favorable Jan · from 3 years of archive data. Recent reports put the water around 25°C (76°F). Check the latest conditions and entry details before you go.

Next window today· 14:00–19:00 · moderate · sunset 18:41

Forecast for this hour · 6:00 · run 11 h ago
2.0 m (6.4 ft)waves — about two meters expected (waves — about six feet expected)

Tap a factor for its source and model point · Forecast 25°C · seasonal avg 26°C ( · Forecast 76°F · seasonal avg 79°F)

Dive windows this week

Mon14:00–19:00 moderate

2.0 m waves · 18 kn wind (6.5 ft waves · 18 kn wind)

Tue6:00–12:00 moderate, 12:00–19:00 favorable

1.6 m waves · 13 kn wind (5.2 ft waves · 13 kn wind)

Wed6:00–8:00 favorable, 8:00–19:00 moderate

1.5 m waves · 16 kn wind (5.0 ft waves · 16 kn wind)

Thu6:00–19:00 favorable

1.2 m waves · 11 kn wind (3.9 ft waves · 11 kn wind)

Fri6:00–19:00 favorable

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

Sat6:00–19:00 favorable

1.0 m waves · 11 kn wind (3.3 ft waves · 11 kn wind)

SunNot in the forecast yet

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 5:36 · Sunrise 5:59 · Sunset 18:41 · some windows run past sunset

Source: Open-Meteo marine · model point 5.6 km from site · updated 25 Oct, 18:25 GMT+13

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Mariner's Cave

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, 52% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.7 m (5.6 ft), wind has typically been 14 knots, historically most favorable
  2. February, 39% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 15 knots
  3. March, 49% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.6 m (5.2 ft), wind has typically been 15 knots
  4. April, 39% of days have historically been favorable, water has typically been 29°C (83°F), waves have typically been 1.6 m (5.3 ft), wind has typically been 16 knots
  5. May, 23% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 1.9 m (6.3 ft), wind has typically been 18 knots
  6. June, 30% of days have historically been favorable, water has typically been 27°C (80°F), waves have typically been 1.7 m (5.5 ft), wind has typically been 17 knots
  7. July, 26% of days have historically been favorable, water has typically been 26°C (79°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 18 knots
  8. August, 31% of days have historically been favorable, water has typically been 26°C (78°F), waves have typically been 1.7 m (5.4 ft), wind has typically been 18 knots
  9. September, 22% of days have historically been favorable, water has typically been 26°C (78°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 19 knots
  10. October, 15% of days have historically been favorable, water has typically been 26°C (79°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 19 knots
  11. November, 27% of days have historically been favorable, water has typically been 27°C (81°F), waves have typically been 1.8 m (5.9 ft), wind has typically been 17 knots
  12. December, 35% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 1.7 m (5.6 ft), wind has typically been 16 knots

January 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

No recorded sightings data for this site yet. Species lists appear as GBIF records and diver reports accumulate.

Fills & rentals nearby

Facts from OpenStreetMap, corrected by the community — listed by distance only. Details change; confirm with the shop.

Shop facts come from OpenStreetMap and community corrections, shown nearest first. PickADive lists facts and contacts only — no listing is sponsored or ranked.

Data updated July 2026

Site details

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

boatcave

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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