Afuera (Whale Shark Aggregation)
Isla Mujeres · Mexico
The open water north of Isla Mujeres hosts the largest known aggregation of whale sharks on the planet, with hundreds of individuals converging June through September to filter spawn from mass spawning events above the Yucatan Shelf. Snorkelers and freedivers enter the water to swim alongside these gentle giants, sometimes 10 to 20 animals visible in a single glance. The aggregation is seasonal but utterly predictable, drawing researchers from around the world to study feeding ecology and migration patterns.
Conditions
Depth
0 to 15 m
Good for beginners
Current
Usually gentle
Can pick up on the edge
Visibility
8 to 20 m
Clearest in the calm season
Water
24 to 31°C
skin or 1mm
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 24 | 24 | 25 | 26 | 27 | 28 | 29 | 29 | 28 | 27 | 26 | 25 |
| Vis (m) | 15 | 15 | 15 | 15 | 10 | 8 | 8 | 8 | 8 | 10 | 12 | 15 |
| Current | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Moderate | Moderate | Gentle | Gentle |
Your chances of seeing each animal
Caribbean Land Hermit Crab
Last confirmed Jan 22, 2026 · 21 records
Very likely
Most dives
Magnificent Frigatebird
Last confirmed May 26, 2026 · 15 records
Very likely
Most dives
Osprey
Last confirmed Jan 9, 2026 · 5 records
Very likely
Most dives
Red Cushion Sea Star
Last confirmed Jul 20, 2025 · 2 records
Likely
About 6 in 10 dives
Whale Shark
Last confirmed Jun 6, 2026 · 8 records
Likely
About 6 in 10 dives
Green Sea Turtle
Last confirmed Apr 14, 2024 · 2 records
Sometimes
About 1 in 3 dives
Cozumel Spiny Lizard
Last confirmed Apr 26, 2026 · 3 records
Sometimes
About 1 in 3 dives
Manta Ray
Expected
Known here, not yet in recent logs
Gear