You can go to San Blas all year round: it is tropical Caribbean and the temperature sits around 28–30 °C in January and in August alike. What changes is not the heat but the rain and the sea. From December to April it is the dry season, with the best sea and the most people; from May to November it rains — almost always hard and short — and the islands are far quieter.
The only thing that genuinely cancels a tour is rough sea: if the port authority closes the port, no boat goes out. Rain on its own cancels nothing.
There is no bad month, there are different months. Here is what to expect from each stretch.
| Months | What it is like | The sea | People |
|---|---|---|---|
| December to March | Dry and windy. The strongest sun of the year | Good, though the trade winds raise waves some days | The busiest. Book weeks ahead |
| April and May | The end of the dry season and the first rains | Among the calmest of the year | Drops off after Easter |
| June to August | Afternoon rain, mornings almost always clear | Calm, good visibility for snorkelling | Few, except school holidays |
| September to November | The rainiest months, with several grey days in a row | Variable; the odd port closure | The lowest of the year |
Caribbean rain is not a grey all-day drizzle. It comes down hard, for half an hour or an hour, and then it clears. It usually does so at dawn or late afternoon — precisely when you are not in the boat.
That is why a tour in the "rainy season" almost always works out: the morning on the islands is clear and the downpour catches you having dinner under a roof. And the water, after the rain, is still 28 degrees.
What rain does change is the colour of the sea near the coast, because the rivers carry sediment. Further out, on the cays, the turquoise holds.
April, May, June. Less wind, stiller water and high visibility underwater.
January to March. That is the real dry season, with clear skies almost every day.
September and October. It rains more, yes, but you sleep on an island with nobody else on it.
Easter week and the two weeks around New Year, if crowds bother you: they are the only times the islands genuinely fill up and everything has to be booked far ahead.
Pick a day on the calendar and see real availability. Free cancellation up to 72 hours before, so holding a spot early does not tie you to anything.
December to April if you want guaranteed sun, and April to June if the state of the sea and snorkelling matter more. September and October are the rainiest, but also the quietest and the best value for accommodation.
Between 28 and 30 °C during the day virtually all year, and around 24 °C at night. The water is always warm: nobody needs a wetsuit.
No. It is only cancelled if the port authority closes the port because of rough sea, and in that case the date is changed or the money returned in full. Rain by itself does not stop the boats.
Panama sits outside the Caribbean hurricane belt: by latitude, the storms pass much further north. There can be swell or occasional strong winds.
In the rainy season, especially at dawn and dusk, and more on vegetated islands than on bare cays. Bring repellent in any month.
San Blas does not get the mass sargassum that reaches other parts of the Caribbean. There can be some loose weed at the shoreline depending on the day's current, nothing that spoils a swim.