Viana do Castelo sits on Portugal's northern Atlantic coast and offers an unusually varied set of dive environments: ocean reefs, a kelp forest, artificial reef structures, and a freshwater lake site at Vilarinho da Furna. Water temperatures run cooler than regions further south, holding around fourteen degrees Celsius in winter and peaking in the mid-to-upper teens through summer and early autumn. The seven sites in our database range from very shallow shore dives suitable for beginners to deeper boat-access reefs reaching thirty-five metres. Recorded species include common octopus, European spiny lobster, flying gurnard, marbled electric ray, gorgonians, and harbour seal.
Monthly water temperature across Viana do Castelo's sites, from satellite sea-surface data corrected for depth. The band shows the site-to-site spread.
Ocean temperatures sit at their lowest through winter and early spring and climb gradually to their modest peak in late summer and autumn before dropping again through December. The cool conditions suit a temperate species list and make a five-millimetre wetsuit or drysuit the sensible choice for most of the year. Visibility varies considerably by site, from a few metres at the shallower shore entries to over twenty-five metres at the cleaner offshore reefs.
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Portugal
Portugal
Portugal
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Portugal
Water temperature around Viana do Castelo ranges from about 14°C in January to 17°C in October, based on satellite sea-temperature data for its dive sites.
With water around 14–17°C, a 7mm or semi-dry suit works in Viana do Castelo year-round.
Fin maps 7 sites in Viana do Castelo (6 scuba diving sites and 1 snorkelling spots).
Across Viana do Castelo's dive sites, May, June, July, August and September are most often reported as the best months to visit.
4 more sites to explore
