[{"data":1,"prerenderedAt":200},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-lady-julia-percy-island-deen-maar-leeward-side-dive-site":9,"spot-lady-julia-percy-island-deen-maar-leeward-side-dive-site":51},{"entries":4,"total":5,"period":6,"type":7,"generated_at":8},[],0,"all_time","reports","2026-10-03T06:32:05.526386Z",{"title":10,"description":11,"canonical_url":12,"og_image":13,"structured_data":14,"breadcrumbs":44},"Snorkeling Conditions at Lady Julia Percy Island (Deen Maar) - Leeward side dive site - How's the Spot","Check snorkeling conditions at Lady Julia Percy Island (Deen Maar) - Leeward side dive site, Victoria. Hazardous conditions, water 14.9°C, waves 2.50m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Flady-julia-percy-island-deen-maar-leeward-side-dive-site","https:\u002F\u002Fhowsthespot.com\u002Fog-default.png",[15,28],{"@context":16,"@type":17,"name":18,"description":19,"url":12,"geo":20,"address":24},"https:\u002F\u002Fschema.org","Place","Lady Julia Percy Island (Deen Maar) - Leeward side dive site","Lady Julia Percy Island (Deen Maar) is Australia's only offshore volcano — a rugged basalt fortress rising from Bass Strait, 8 km off Victoria's coast. The leeward (eastern) side offers relative sh...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-38.4126,142.0018,{"@type":25,"addressRegion":26,"addressCountry":27},"PostalAddress","Victoria","Australia",{"@context":16,"@type":29,"name":30,"description":11,"url":12,"breadcrumb":31},"WebPage","Snorkeling Conditions at Lady Julia Percy Island (Deen Maar) - Leeward side dive site",{"@context":16,"@type":32,"itemListElement":33},"BreadcrumbList",[34,39,42],{"@type":35,"position":36,"name":37,"item":38},"ListItem",1,"Home","https:\u002F\u002Fhowsthespot.com",{"@type":35,"position":40,"name":26,"item":41},2,"https:\u002F\u002Fhowsthespot.com\u002Fexplore?region=victoria",{"@type":35,"position":43,"name":18,"item":12},3,[45,47,49],{"label":37,"href":46},"\u002F",{"label":26,"href":48},"\u002Fexplore?region=victoria",{"label":18,"href":50},"\u002Fspots\u002Flady-julia-percy-island-deen-maar-leeward-side-dive-site",{"id":52,"name":18,"slug":53,"latitude":22,"longitude":23,"description":54,"difficulty":55,"image_url":56,"status":57,"tide_constituents":58,"hazard_entries":109,"access_info_structured":138,"area_boundary":56,"routes":56,"created_at":146,"updated_at":147,"today_conditions":148,"today_verdict_view":170,"images":196,"submitted_by":197,"region_name":26,"verification_status":199,"verified_at":56,"disputed":161,"verifier_count":5,"last_verified_display_name":56},"82f8f15a-59f2-4182-8b0c-1a5344551d07","lady-julia-percy-island-deen-maar-leeward-side-dive-site","Lady Julia Percy Island (Deen Maar) is Australia's only offshore volcano — a rugged basalt fortress rising from Bass Strait, 8 km off Victoria's coast. The leeward (eastern) side offers relative shelter from prevailing south-westerly swells, where underwater terrain drops from 5 to 25 metres across boulder gardens, rocky reefs and bommies. This remote, boat-only site sits beside a thriving Australian fur seal colony, with sea caves, encrusted ledges and kelp forests creating a dramatic seascape. The island is a State Faunal Reserve, so expect pristine conditions and abundant wildlife in a truly wild setting.","advanced",null,"published",{"name":59,"amplitude":75,"phase":91,"latitude":22,"model":107,"epoch":108},[60,61,62,63,64,65,66,67,68,69,70,71,72,73,74],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[76,77,78,79,80,81,82,83,84,85,86,87,88,89,90],0.003802871096663876,0.010413812804651862,0.1767431470781165,0.038962878136952005,0.13014800328973772,0.0037835946817970805,0.005097298217355835,0.005336492163631262,0.009528811615418136,0.1297295551778061,0.05436882518969233,0.03331470279174859,0.011608362019040764,0.13765045396382275,0.012389386392156749,[92,93,94,95,96,97,98,99,100,101,102,103,104,105,106],155.8435649617835,280.97711866534945,256.5347807071285,115.77471897752253,42.75259116024236,115.02229155231616,171.11273804819973,246.99553371612353,294.1100398374652,237.88053928887075,250.58120919358544,223.76220677166975,9.516030563897859,113.48235013236194,122.15831573259318,"EOT20","1992-01-01T00:00:00Z",[110,116,119,123,127,132,135],{"name":111,"description":112,"severity":113,"season_start":114,"season_end":115},"Open ocean swell exposure","Despite being on the leeward side, the site is exposed to Bass Strait swells which can build suddenly. Calm conditions are essential.","warning",6,9,{"name":117,"description":118,"severity":113,"season_start":56,"season_end":56},"Strong currents and rips","Tidal flows around the island can produce strong currents, particularly on changing tides. Drift diving conditions are possible.",{"name":120,"description":121,"severity":122,"season_start":56,"season_end":56},"Remote location","The island lies 8 km offshore with no facilities, shelter or emergency services. Self-sufficiency and marine radio\u002FEPIRB are mandatory.","danger",{"name":124,"description":125,"severity":126,"season_start":56,"season_end":56},"Restricted access (State Faunal Reserve)","Landing on the island requires a permit. Snorkeling\u002Fdiving must be done from an authorised boat charter.","caution",{"name":128,"description":129,"severity":126,"season_start":130,"season_end":131},"Cold water temperatures","Bass Strait waters range from 12–18°C year-round. Thick wetsuit or drysuit required.",5,12,{"name":133,"description":134,"severity":113,"season_start":36,"season_end":131},"Strong ocean swells","The island sits exposed in Bass Strait with large Southern Ocean swells rolling in year-round, making conditions highly variable even on the leeward side.",{"name":136,"description":137,"severity":113,"season_start":36,"season_end":131},"Strong currents and surge","Tidal currents and wave surge around the island can be powerful, especially when swells wrap around the headlands.",{"directions":139,"parking":140,"facilities":141,"fees":144,"access_method":145},"The island lies 8 km off the coast near Yambuk, about 21 km south-west of Port Fairy. Boat trips depart from Port Fairy Harbour. The leeward dive site is on the eastern side at -38.4126, 142.0018.","Parking available at the Port Fairy boat ramp precinct off Gipps Street, Port Fairy.",[142,143],"parking","boat_ramp","Join a licensed charter from Port Fairy (~$100–$200 pp). Independent landing requires a Parks Victoria permit.","boat","2026-07-27T02:57:53.119454Z","2026-08-04T05:34:24.990711Z",{"verdict":149,"evaluated_at":150,"models":151},"no_go","2026-10-03T02:18:01.155098Z",[152,159,165],{"model_name":153,"is_favourable":154,"value":155,"threshold":156,"unit":157,"operator":158},"Wind Speed",true,2.31,10,"kn","lte",{"model_name":160,"is_favourable":161,"value":162,"threshold":163,"unit":164,"operator":158},"Wave Height",false,2.495,0.5,"m",{"model_name":166,"is_favourable":161,"value":167,"threshold":40,"unit":168,"operator":169},"Visibility",0.99,"","gte",{"verdict":149,"rating":171,"evaluated_at":150,"generated_at":150,"source":172,"confidence":173,"visibility":176,"parameters":177,"models_passed":40,"models_total":130},"Hazardous","precomputed",{"level":174,"value":175},"High",100,{"score":167,"rating":56,"confidence":56},[178,180,185,188,193],{"name":160,"value":179,"label":56,"unit":164,"favourable":161,"score":5,"optimal_max":163,"marginal_max":36},2.4953563879685268,{"name":181,"value":182,"label":56,"unit":183,"favourable":161,"score":36,"optimal_max":184,"marginal_max":131},"Swell Period",10.55,"s",8,{"name":153,"value":186,"label":56,"unit":157,"favourable":154,"score":43,"optimal_max":156,"marginal_max":187},2.3131696,15,{"name":189,"value":190,"label":56,"unit":191,"favourable":161,"score":5,"optimal_max":130,"marginal_max":192},"Precipitation",32.2,"mm",20,{"name":194,"value":56,"label":195,"unit":168,"favourable":154,"score":43,"optimal_max":56,"marginal_max":56},"Tidal Phase","slack",[],{"display_name":198},"Daniel","unverified",1791009166087]