When To Go · Destination Guide
Aegean reefs, blue caverns and Delos antiquity from a lively Cycladic base
Updated Apr 26, 2026 • 28 sources
When to go
The best allaround trip windows are MayJune and SeptemberOctober.
Best overall window
Warm days, active operators, easier Delos walking and lateseason water around 21°C to 24°C.
Outside that window
Quiet offseason with rain, stronger winter seastate risk and many beach or dive operations paused.
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: Best | Overall - Jun: Best | Overall - Jul: More variable | Overall - Aug: More variable | Overall - Sep: Best | Overall - Oct: Best | Overall - Nov: Good | Overall - Dec: Tradeoffs |
These regional shifts apply only to the selected scope.
| Area | Best months | Why it changes |
|---|---|---|
| South and East Coast Bays | May to October | Lia, Paradise, Kalafatis and Agia Anna are the practical watersports base areas when operators are running. Main caution: Surface chop can add a little more texture on exposed entries. |
| North Coast Beaches | May to June and September to October | Panormos, Ftelia and Agios Sostis can be beautiful but are more exposed to northerly winds. Main caution: Wind Exposed Departures. |
| Delos and Rineia Channel | April to June and September to October | Delos, Rineia and smallislet trips depend heavily on boat schedules and sea state. Main caution: Wind Exposed Departures. |
These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.
Mediterranean Monk Seal Habitat
Best for Scuba, Snorkel, Freedive
Apr to Oct
Tragonisi and Chtapodi are associated with Monachus monachus habitat.
Mediterranean Barracuda Schools
Best for Scuba, Snorkel
Jun to Oct
Kalafakiona Reef and other fishy sites can produce schools of Mediterranean barracuda in clear water.
Warmest Swimming Water
Best for Snorkel, Freedive, Topside
Jul to Oct
The Aegean around Mykonos feels best for long snorkels and relaxed surface intervals from high summer into early fall, with September often offering the best crowdtowatertemperature balance.
Delos Archaeology Season
Best for Topside
Apr to Nov
Delos is the signature nondiving encounter.
Meltemi Wind Window
Best for Scuba, Freedive, Snorkel, Topside
Jun to Sep
The seasonal northerly wind is part of the Cyclades experience.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.