Praia do Camilo
Lagos · Golden Sand
September Average: 20.0°C
PT
Portugal Sea Temperature in September
Historical 30-year sea surface temperatures across 36 coastlines in Portugal for September. Derived from NOAA 0.25° blended satellite and in-situ marine observations.
Notice: 30-year historical climatological monthly mean (1991–2020), not a live single-day sensor forecast.
Canary Current, Coastal Upwelling & The Nazaré Canyon
Despite sitting at Mediterranean latitudes, Portugal’s Atlantic coast and Algarve exhibit cool sea surface temperatures (averaging 18.5–20.3°C in August). Persistent northerly summer winds (the Nortada) push surface waters offshore, driving active coastal upwelling that draws deep, nutrient-rich ocean layers (14–16°C) to the shoreline. Off central Portugal at Nazaré, the continental shelf is bisected by the Nazaré Submarine Canyon (Canhão da Nazaré) — a 230km long, 5,000m deep underwater chasm terminating just 1km offshore. In winter, this bathymetric trench acts as a hydraulic funnel, refracting and focusing North Atlantic storm swells into world-record 20–30m breaking waves at Praia do Norte.
Oceanographic Phenomenon:
Summer Upwelling (Nortada) & Deep Canyon Wave Refraction
Thermal Lag Characteristic:
Pronounced oceanic thermal lag: Atlantic water temperature peaks in late August and September (20.3°C), warming far slower than Mediterranean basins but buffering autumn cooling.
Peak Bathing Average:
August / September