Azores Dive Conditions: Temperature, Visibility & Seasons

Azores Diving Conditions: Visibility, Temperature, Currents, and Seasons

Before you plan the Azores dive trip — and before you book your expedition to Princess Alice Bank or Dollabarat Seamount — you need to understand the conditions. The Azores are not a tropical Caribbean destination where you can drop in any weekend and expect glass-still water and 28°C seas. This is the mid-Atlantic. The ocean here is deep, wild, and seasonally dynamic. The diving is world-class year-round, but conditions vary dramatically by month, and some months are clearly better for specific types of diving.

This guide gives you the real numbers — temperature by season, visibility ranges, current patterns, and what each month actually feels like underwater — so you can plan your trip around the conditions you want.

The Numbers That Matter Most

Water temperature: 16–25 °C (61–77 °F) across the year. Winter drops to 16–17 °C (61–63 °F), summer peaks at 22–25 °C (72–77 °F). A 5 mm wetsuit is the baseline year-round for comfort, though many divers add a 3 mm hood in winter. Some divers do summer dives in a 3 mm shorty, but a full suit gives you more flexibility between dives.

Visibility: 15–40 m (50–130 ft). Offshore and seamount dives typically see 25–40 m when conditions are stable, driven by nutrient-rich upwellings that keep the water crystal clear. Near-shore coastal dives run 15–30 m, which is still exceptional by most standards. Visibility is at its best during June–September when surface chop is minimal and the water column is stratified.

Current: Mild near-shore, strong to very strong at offshore seamounts. The Gulf Stream influence creates persistent nutrient upwellings across the archipelago. Princess Alice Bank and Dollabarat regularly see currents of 2–3 knots, and experienced divers stay close to the descent line until the current stabilizes. North-facing coasts experience stronger swell effects, which can translate to current shifts at depth.

Thermoclines: There are no strong thermoclines in most Azores waters. Unlike the Caribbean where a warm surface layer sits over cold deep water, the Azores tend to have a gradual temperature change with depth. You may notice a 2–3°C drop around 20–25 m in summer, but it's far less pronounced than in tropical destinations. This means a single wetsuit thickness usually works throughout your profile.

Depth range by site type: Coastal and shore dives 5–30 m (15–100 ft). Offshore seamount dives 30–60+ m (100–200+ ft). Princess Alice Bank's summit is at 32 m, but the seamount rises from 1,500+ meters — meaning the bottom drops off almost immediately from the summit line. Dollabarat and other deep seamounts have pelagic zones extending well below recreational dive limits.

Best season overall: June through October for warmest water, calmest seas, highest visibility, and peak pelagic encounters. Shoulder months May and November offer solid conditions with fewer divers. Winter (December–February) is challenging for recreational divers but offers unique opportunities for experienced divers.

Month by Month

January – March: Deep Water, Quiet Seas

Winter in the Azores means water temperatures of 16–17 °C (61–63 °F) and significantly reduced diving activity. This is not a time for casual dives — rough seas, cold water, and unpredictable weather mean the diving is reserved for experienced, properly equipped divers.

Visibility during winter is typically 15–25 m near shore and can reach 25–30 m on stable offshore days. The cold water drives some species deeper, but it also concentrates baitfish, which attracts predators. Blue shark sightings are possible year-round, and winter expeditions to Dollabarat can produce remarkable encounters with mako and blue sharks feeding on concentrated bait.

Dolphins are present year-round in Azores waters, and January–February sometimes offers calmer days between weather systems when visibility and animal activity are surprisingly good. Night dives in this season are a unique Azores experience — tope sharks, squid, and clouds of krill respond to the light, creating an otherworldly environment.

Wetsuit: 5 mm full suit, plus hood, gloves, and boots. Many divers layer a 3 mm hood under a hooded vest. Rental gear is widely available at the major dive shops.

Target species: Blue sharks, mako sharks, dolphins, various whale species (passing through migration corridors), tope sharks on night dives.

Best sites: Pico coastal dives (Dollabarat expeditions), São Miguel sheltered sites, Faial sheltered bays.

April – May: Conditions Improving, Pelagics Still Present

Spring is when Azores diving transitions from challenging to genuinely rewarding. Water temperatures climb to 17–19 °C (63–66 °F), seas generally calm, and visibility begins building toward its annual peak of 30–40 m.

Whale season runs strongly through April and May — 20+ species of whales and dolphins pass through Azores waters annually, and the spring migration corridor brings humpback, fin, sperm, and pilot whales. Dolphin encounters are daily occurrences on coastal dives.

Pelagic activity is still elevated in May. Princess Alice Bank starts producing mobula rays in late May, though the major aggregations don't build until July. The Dollabarat shark dives continue strong through May as water temperatures begin warming.

Shoulder season pricing applies in April and May — dive packages and accommodation are noticeably cheaper than the June–October peak, and the number of divers in the water is far lower.

Wetsuit: 5 mm full suit, or 5 mm shorty for longer summer-type dives. Hood becomes optional for May, but still recommended for early-season dives.

Target species: Whales and dolphins, blue sharks, first mobula rays at Princess Alice, tuna, marlin, green and loggerhead sea turtles (beginning their summer passage).

Best sites: All sites begin to be accessible. Santa Maria coastal dives become comfortable. Pico and Faial start delivering reliable pelagic encounters.

June – July: Summer Kickoff

June is the transition into prime Azores diving. Water warms to 19–22 °C (66–72 °F), seas are generally calm, visibility climbs to 25–35 m, and the first major mobula aggregations appear at Princess Alice Bank.

June is also prime manta ray season. Manta rays (Manta birostris) gather around Pico, Faial, and the transit routes between islands. Encounters at Príncipe Alberto Passage and coastal drops around Pico are frequent, and the rays' size and behavior — with individuals regularly exceeding 4–5 meters wingspan — make them one of the most memorable Azores wildlife encounters.

Whale activity remains strong in June, and the combination of whales, mobulas, and manta rays on the same trip is a real possibility. This is when Azores diving earns its reputation as a world-class pelagic destination.

Current conditions are moderate at most sites, but offshore seamount expeditions require strong swim fitness and good buoyancy control. A certified Advanced Open Water with some open-ocean experience is the recommended minimum for boat expeditions to Princess Alice Bank.

Wetsuit: 5 mm full suit remains comfortable for most divers. The warmth of the water means some divers transition to a 3 mm full suit or thick shorty by late June.

Target species: Manta rays (major season starts), mobula rays (beginning), whales, blue sharks, marlin, dolphins, sea turtles, ocean sunfish (mola mola — Azores is one of Europe's best spots).

Best sites: Princess Alice Bank (first major aggregations), Vila Franca do Campo (excellent water clarity, warm water), Dollabarat (strong shark activity), coastal sites across all islands.

August – September: Peak Conditions

August and September are the absolute peak of Azores diving. Water temperatures hit their annual maximum of 22–25 °C (72–77 °F). Visibility reaches 30–40 m on stable days. Seas are generally calm. The combination of warm water, excellent visibility, and high animal abundance makes this the best two-month window in the Azores.

Mobula ray aggregations at Princess Alice Bank are at their peak — diving with 1,000+ rays on a single dive is a real and repeatable experience during these months. This is the month when dive operators report the highest success rates for mobula encounters.

Manta rays continue to visit through September, and the addition of ocean sunfish (Mola mola) sightings in August and September makes the Azores arguably the best spot in Europe for encountering this extraordinary fish. Sunfish can weigh up to 2 tons and can reach 3 meters in width — diving alongside one is unforgettable.

Blue shark activity at Dollabarat remains strong through September, with sardine bait balls creating feeding frenzies that attract multiple shark species. Mako sharks and sailfish are also reported during this period.

Current conditions during these peak months are generally moderate: 1–2 knots on most coastal and caldera sites, and 2–3 knots on offshore seamount dives — manageable for divers with good fitness and proper briefing.

Wetsuit: 3 mm full suit or thick shorty is comfortable for most August and September dives. A 5 mm suit is useful for early-morning dives and seamount expeditions where you'll be in the water for hours.

Target species: Peak mobula rays, manta rays, ocean sunfish (mola), whales (late season tail-end), blue sharks, mako sharks, marlin, dolphins, sea turtles, all reef fish species.

Best sites: Every site is in full operation. Princess Alice Bank, Dollabarat, Vila Franca, Ilhéus das Cabras, Formigas Islets, Terceira wrecks — all running daily.

October: Final Month of Prime

October is the closing window for peak Azores diving. Water temperatures stay warm at 21–23 °C (70–73 °F), visibility remains excellent at 25–35 m, and mobula ray activity continues through mid-October. The Princesa Alice Bank season typically wraps up around mid-month when temperature and current patterns begin shifting.

October is also shoulder season pricing, which makes it a financially smart choice if you want peak conditions without peak-season rates. The number of divers drops off sharply after the first half of October.

Whale activity begins tapering in October as southern-migration species start their journey, but northern-migration species like fin whales may still be present in the first half of the month.

Wetsuit: 5 mm full suit for early October; 3 mm full suit or thick shorty for later October. Hood recommended for seamount dives.

Target species: Late-season mobula rays, manta rays (waning), fin whales, dolphins, blue sharks (early month), sea turtles.

Best sites: Princess Alice Bank (first two weeks of October remain productive), all coastal and offshore sites.

November – December: Season Winds Down

November brings the transition to winter. Water temperatures drop to 18–21 °C (64–70 °F) in November and then to 16–17 °C (61–63 °F) by December. Visibility generally stays decent at 20–30 m near shore, but rougher seas mean fewer dive operations, especially on offshore expeditions.

November is a mixed month. Some operators run late-season Princess Alice Bank dives in early November if conditions allow, but blue-water seamount expeditions become increasingly unreliable. Coastal dives on São Miguel and Pico are still feasible throughout November on calm days.

By December, most operators significantly reduce their schedule. The diving that does happen is for experienced divers who are comfortable in cold water, strong currents, and rough sea conditions. Night dives remain a unique offering, and some experienced operators continue running pelagic coastal dives on stable days.

Wetsuit: 5 mm full suit with hood, gloves, and boots. This is non-negotiable — without proper thermal protection, December diving in the Azores is miserable and potentially dangerous.

Target species: Pelagic species still present (blue sharks, dolphins), night dive species (tope sharks, squid), coastal reef fish.

Best sites: São Miguel coastal dives, sheltered bays on Pico and Faial. Offshore seamount dives are generally suspended.

Reading Azores Currents

Current is the single most variable element of Azores diving. Unlike Cozumel's predictable north-running reef current, Azores currents are driven by open-ocean dynamics — temperature gradients, tidal exchange, wind patterns, and the confluence of the Gulf Stream with colder northern waters.

Near-shore sites: Vila Franca, Ilhéus das Cabras, and most São Miguel coastal dives experience mild currents (0.5–1.5 knots). These are comfortable for Open Water and Advanced Open Water divers. The caldera interior is essentially protected from ocean currents entirely.

Offshore seamounts: Princess Alice Bank and Dollabarat regularly produce 2–3 knot currents, sometimes stronger during active upwelling events. Divers are instructed to descend slowly along the boat's anchor or descent line, monitor their position relative to the boat, and abort the dive if current exceeds comfortable swim speed. The current is what makes these dives technically demanding — and it's also what drives the nutrient concentration that attracts 1,000+ mobula rays.

Seasonal shifts: Current patterns shift seasonally. Summer months (June–September) produce the most stable current conditions — the warm surface layer and stratified water column create consistent flow. Winter months bring more variable currents as cold frontal systems push through the Atlantic.

Geographic Variation

The Azores archipelago spans nearly 600 km from northeast to southwest, and conditions can vary significantly between island groups:

• São Miguel (eastern group): Warmest waters, most sheltered, most dive sites, most dive shops. Best for beginners and intermediate divers. Water temps typically 0.5–1 °C warmer than the western islands.
• Pico (central group): The pelagic diving capital. Dollabarat Seamount, Princess Alice Bank approach, and the best shark encounters. Stronger currents and more challenging conditions. Water temps slightly cooler than São Miguel.
• Faial (central group): Similar to Pico but milder overall. The underwater museum dive is a highlight. DiveAzores is run by marine biologists and is the most eco-conscious operation in the archipelago.
• Santa Maria (southernmost): Warmest individual island, most sheltered from Atlantic swells. Sandy bottoms with reef patches. Best coastal diving if you're looking for easier conditions. Water temps 0.5–1 °C warmer than the central group.
• Terceira, Graciosa, São Jorge (central-western): Fewer verified dive shops but interesting wreck and coastal diving on Terceira. Conditions similar to the central group.

Gear Recommendations for Azores Conditions

Wetsuit: 5 mm full suit is the standard year-round recommendation. Most rental shops carry these. Bring your own if fit matters to you — rental suits at the Azores tend to be generic sizing.

Accessories: Hood (especially November–April), gloves, and boots for winter dives. Reef shoes for rocky shore entries on Pico and Faial.

Dive computer: Essential for seamount dives. Many Azores seamount sites require multi-level diving profiles. Open-ocean blue-water dives can push deep (Princess Alice summit at 32 m, Dollabarat accessing 40–50 m layers), and dive computers are the only practical way to manage your no-decompression limits accurately.

Surface marker buoy: Recommended for offshore dives, especially at Princess Alice and Dollabarat where you may be far from the boat in open ocean. Strong currents can drift divers significant distances if the dive is terminated early.

Underlight: Useful for night dives on coastal sites and the Formigas Islets reserve. The Azores' dark, clear ocean waters make underlights especially effective for spotting nocturnal marine life.

Summary Table

Bottom Line

The Azores delivers world-class diving from May through October, with August and September offering the warmest water, clearest visibility, and highest animal abundance. Winter diving is challenging but rewarding for experienced divers willing to work with rough conditions and cold water. The key to a great Azores trip is matching your skill level, your goals, and your risk tolerance to the specific conditions of the month you choose.