[{"data":1,"prerenderedAt":191},["ShallowReactive",2],{"leaderboard-total":3,"spot-seo-portsea-ocean-beach-back-beach":9,"spot-portsea-ocean-beach-back-beach":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 Portsea Ocean Beach (Back Beach) - How's the Spot","Check snorkeling conditions at Portsea Ocean Beach (Back Beach), Victoria. Hazardous conditions, water 14.4°C, waves 1.48m","https:\u002F\u002Fhowsthespot.com\u002Fspots\u002Fportsea-ocean-beach-back-beach","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","Portsea Ocean Beach (Back Beach)","Portsea Ocean Beach — known locally as \"Back Beach\" — is a wild 2.5 km stretch of white sand on the ocean side of the Mornington Peninsula, within Mornington Peninsula National Park. Exposed to the...",{"@type":21,"latitude":22,"longitude":23},"GeoCoordinates",-38.341,144.715634,{"@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 Portsea Ocean Beach (Back Beach)",{"@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\u002Fportsea-ocean-beach-back-beach",{"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":130,"area_boundary":56,"routes":56,"created_at":138,"updated_at":139,"today_conditions":140,"today_verdict_view":161,"images":187,"submitted_by":188,"region_name":26,"verification_status":190,"verified_at":56,"disputed":152,"verifier_count":5,"last_verified_display_name":56},"e07e259f-8a5d-488b-bd9b-86107405ab1e","portsea-ocean-beach-back-beach","Portsea Ocean Beach — known locally as \"Back Beach\" — is a wild 2.5 km stretch of white sand on the ocean side of the Mornington Peninsula, within Mornington Peninsula National Park. Exposed to the full force of Bass Strait, this beach features powerful rolling swells, deep rip currents, and offshore reefs that create dramatic surf conditions. Unlike the calm waters of Port Phillip Bay, this is a raw, energetic coastline where snorkelers need strong swimming ability. The beach is backed by low coastal heath and dramatic cliffs, offering a sense of remoteness despite being close to the resort town of Portsea.","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],0.01518292922640474,0.01472168794339704,0.2155732427365139,0.047741180988985624,0.7146294438004043,0.0485776342591161,0.006695082368918923,0.006271020015272035,0.14601752475277144,0.15123126870810275,0.06594009495004506,0.03337316900793892,0.013468462951739814,0.20394125347557102,0.021713807928545815,[92,93,94,95,96,97,98,99,100,101,102,103,104,105,106],302.1631015167527,298.7176095127919,271.3918072985951,156.97924453406665,31.38161022641543,141.6326019564649,171.65689595655897,233.23454694124558,351.7257123300841,251.3588879870997,263.4414581883648,241.78128985020675,0.8177182716631818,156.54102600930918,161.48724200406718,"EOT20","1992-01-01T00:00:00Z",[110,115,119,124],{"name":111,"description":112,"severity":113,"season_start":36,"season_end":114},"Strong Rips and Shore Dumps","Powerful rip currents and shore break (dumping waves) are common year-round. Only swim between the flags when lifeguards are on duty.","danger",12,{"name":116,"description":117,"severity":118,"season_start":36,"season_end":114},"Offshore Reefs and Rocks","Submerged rocky reefs line the beach, creating uneven bottom contours and sudden shallow areas hazardous in surf.","warning",{"name":120,"description":121,"severity":118,"season_start":122,"season_end":123},"Large Swell Conditions","Bass Strait generates consistent large swells, especially during winter (June–August) and spring, making entry and exit difficult.",6,11,{"name":125,"description":126,"severity":127,"season_start":128,"season_end":129},"Cold Water Temperatures","Ocean water temperature ranges from 12–18°C, with significant cold shock risk for unprepared swimmers and snorkelers.","caution",5,10,{"directions":131,"parking":132,"facilities":133,"fees":136,"access_method":137},"From Melbourne, take the M1 to the Mornington Peninsula Freeway, then follow the signs to Portsea. Turn onto Point Nepean Road and then onto Back Beach Road, which leads to the beach car park. The beach is approximately 1.5 hours drive from Melbourne CBD.","Limited roadside parking is available along Back Beach Road. Spaces fill quickly on summer weekends and public holidays.",[134,135],"toilets","parking","No entry fee. Part of Mornington Peninsula National Park — no park fees apply for beach access.","shore_entry","2026-07-27T02:58:11.152390Z","2026-08-04T05:37:15.120985Z",{"verdict":141,"evaluated_at":142,"models":143},"no_go","2026-10-03T02:22:07.107633Z",[144,150,156],{"model_name":145,"is_favourable":146,"value":147,"threshold":129,"unit":148,"operator":149},"Wind Speed",true,2.34,"kn","lte",{"model_name":151,"is_favourable":152,"value":153,"threshold":154,"unit":155,"operator":149},"Wave Height",false,1.481,0.5,"m",{"model_name":157,"is_favourable":152,"value":158,"threshold":40,"unit":159,"operator":160},"Visibility",0.99,"","gte",{"verdict":141,"rating":162,"evaluated_at":142,"generated_at":142,"source":163,"confidence":164,"visibility":167,"parameters":168,"models_passed":36,"models_total":128},"Hazardous","precomputed",{"level":165,"value":166},"High",100,{"score":158,"rating":56,"confidence":56},[169,171,176,179,184],{"name":151,"value":170,"label":56,"unit":155,"favourable":152,"score":5,"optimal_max":154,"marginal_max":36},1.4805164543999998,{"name":172,"value":173,"label":56,"unit":174,"favourable":152,"score":36,"optimal_max":175,"marginal_max":114},"Swell Period",11.95,"s",8,{"name":145,"value":177,"label":56,"unit":148,"favourable":146,"score":43,"optimal_max":129,"marginal_max":178},2.3392580111270647,15,{"name":180,"value":181,"label":56,"unit":182,"favourable":152,"score":5,"optimal_max":128,"marginal_max":183},"Precipitation",32.1,"mm",20,{"name":185,"value":56,"label":186,"unit":159,"favourable":152,"score":36,"optimal_max":56,"marginal_max":56},"Tidal Phase","flood",[],{"display_name":189},"Daniel","unverified",1791009187832]