Photo: FusTup · CC BY-SA 4.0 Two things matter: the season (calm seas, boats running) and the time of day (the angle of the sun).
Time of day
The effect depends on sunlight entering the underwater opening. Aim for roughly 10:00–14:00, with late morning usually the strongest. Cloudy days give a much weaker blue.
Month by month
| Months | Conditions |
|---|---|
| April – May | Fewer boats, cooler sea, quieter cave |
| June | Long days, good light, crowds building |
| July – August | Peak season: busiest queues at midday |
| September | Warm sea, calmer crowds — often ideal |
| October | Fewer departures; weather more variable |
Weather
The low entrance closes in rough seas. Southerly swell is the most common reason for closures, so keep a spare day in your plans if the cave is a must.
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