Lake Superior diving on the Ontario shore combines accessible beginner sites with a notable deep wreck. Silver Islet offers shore-based exploration of historical artefacts in shallow water, while Silver Harbour provides reef, wreck, and artificial reef structures within easy depth for beginners. The Howard, resting offshore near Victoria Island at significant depth, is the advanced option, requiring boat access and offering visibility that varies from poor to moderate. The lake runs cold for most of the year, with surface temperatures reaching their highest in late summer before dropping sharply through autumn.
Monthly water temperature across Lake Superior's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Lake Superior remains very cold from late autumn through spring, with temperatures near freezing from winter into early summer. Surface temperatures peak in late summer before falling quickly, making that window the most comfortable period for wetsuit diving. Drysuits extend the usable season considerably.
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Water temperature around Lake Superior ranges from about 1°C in February to 17°C in August, based on satellite sea-temperature data for its dive sites.
In the warm season (about 17°C) a 7mm or semi-dry suit is comfortable in Lake Superior; in the coldest months (about 1°C) step up to a drysuit.
Fin maps 3 sites in Lake Superior (3 scuba diving sites and 1 snorkelling spots, with some suited to both).
3 more sites to explore
