When To Go · Destination Guide
Atlantic reef and wreck adventures on Lisbon's wild side
Updated Dec 13, 2025 • 21 sources
When to go
Sesimbra is diveable yearround, but conditions change fast because you are on the open Atlantic.
Best overall window
Warmest water and the easiest beach logistics; mornings often calmer before wind builds.
Outside that window
More Atlantic storms and rain; expect fewer offshore windows and choose sheltered sites.
Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.
The overall row stays visible so you can compare it against the currently selected scope.
| Scope | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Overall - Jan: Tradeoffs | Overall - Feb: Tradeoffs | Overall - Mar: Tradeoffs | Overall - Apr: Good | Overall - May: Good | Overall - Jun: Best | Overall - Jul: Best | Overall - Aug: Best | Overall - Sep: Best | Overall - Oct: Good | Overall - Nov: Tradeoffs | Overall - Dec: Tradeoffs |
These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.
Bottlenose dolphin spotting (Sado Estuary boat trips)
Best for Topside
Year-round
A classic addon day from nearby Setubal: boat tours search for resident dolphins and coastal birdlife.
Kelp and invertebrate garden season
Best for Scuba, Snorkel
Apr to Jul
Spring into early summer often brings lush kelp and busy reef life in the Marine Park, which is great for photographers who like texture and macro.
Late-summer calm windows for Cape Espichel
Best for Scuba, Freedive
Aug to Oct
Historically, some of the best offshore windows arrive as summer transitions to autumn.
Winter swell watching and storm photography
Best for Topside
Dec to Feb
Even when diving is limited, the coast can be spectacular.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.