SnorkelForecast Field Atlas / Seasonal planning
Best Places to Snorkel in October
Where to snorkel in October: compare historical wave, wind, calm-water and temperature evidence at monitored destinations worldwide.
October brings northern autumn and southern spring. Some tropical Southern Hemisphere coasts move toward their wet and marine-stinger seasons.
Original comparable model evidence
October conditions by destination
These locations have a full year of comparable model observations. The table uses October data only, not the annual average; it is not a complete ranking of all the world’s reefs. Importantly, the model averages nighttime hours scored zero, so even a top place can have a modest score. This is not a percentage of safe snorkeling time.
- Destinations compared
- 11
- Countries represented
- 5
- Observed month
- Oct 2025
| Destination | Model score /100 · night included | Calm sampled hours | Sea temperature | Hemisphere |
|---|---|---|---|---|
| 01 Cozumel Mexico · Water temperature history | 29.6 | 76%81% calm mornings | 30.1°C | Northern |
| 02 Maui USA · Water temperature history | 27.2 | 74%77% calm mornings | 27.4°C | Northern |
| 03 Key Largo USA · Water temperature history | 26.9 | 68%68% calm mornings | 28.4°C | Northern |
| 04 Mallorca Spain · Water temperature history | 26.2 | 54%50% calm mornings | 24.0°C | Northern |
| 05 Roatán Honduras · Water temperature history | 25.7 | 47%54% calm mornings | 29.9°C | Northern |
| 06 Bahia Honda USA · Water temperature history | 24.9 | 42%39% calm mornings | 29.1°C | Northern |
| 07 Kauai USA · Water temperature history | 24.3 | 0%0% calm mornings | 28.2°C | Northern |
| 08 Looe Key USA · Water temperature history | 24.3 | 40%39% calm mornings | 29.2°C | Northern |
| 09 Dry Tortugas USA · Water temperature history | 22.4 | 21%23% calm mornings | 29.1°C | Northern |
| 10 Oahu USA · Water temperature history | 21.9 | 0%0% calm mornings | 27.1°C | Northern |
| 11 Kralendijk Bonaire · Water temperature history | 20.2 | 21%28% calm mornings | 29.7°C | Northern |
South of the equator
Southern Hemisphere destinations
September to November is Southern Hemisphere spring moving toward summer. Tropical wet and marine-stinger seasons begin in some areas before the calendar summer.
No qualifying southern locations in the current comparable cohort; this is not a finding that southern snorkeling is worse.
Southern locations to investigate · unranked
These existing forecast destinations do not have comparable monthly scores yet and are not recommendations for this month.
- Jervis BayTemperate New South Wales shore snorkeling; check exposure, swell and rainfall.
- Ningaloo ReefWestern Australian fringing reef; safe access and tide windows vary by site.
- Great Barrier ReefQueensland tropical reefs; summer overlaps marine-stinger, wet and cyclone seasons.
- Goat Island Marine ReserveNew Zealand temperate-water reserve; local water temperature and swell matter.
North of the equator
Northern Hemisphere destinations
September to November is Northern Hemisphere autumn moving toward winter. In the Atlantic, tropical-storm risk and changing swell exposure matter more than a general 'best month' label.
How to use this comparison
Historical, not a live forecast
The sampled month is part of the 1 Oct 2025–30 Sep 2026 historical window. Models are not underwater observations or predictions for next year. Follow each location report for the current forecast.
Coverage before ranking
Each listed destination meets a 12-month coverage check with at least 20 qualified days per month and 18 hourly samples per day. No partial-year comparisons or mixed scoring profiles.
What 25/100 means
The all-hours Snorkel Score includes night hours scored zero. A 25/100 score does not mean a reef is poor or 25% of hours are safe. Calm-share is a wind-and-wave threshold, also not a safety guarantee. Visibility, shorebreak and hazardous currents require local checks.
Underlying data: Open-Meteo Marine API and historical weather. View the annual comparison. Commercial listings never affect the order.