San Esteban IslandSan Esteban Island at a Glance
About San Esteban Island
San Esteban Island (Isla San Esteban) is an island in the Gulf of California off the coast of Sonora, Mexico. It is uninhabited by people and is notable for its wildlife, including species that occur only on the island.
The island’s terrain is rocky and arid, and it supports populations of seabirds, reptiles and other desert-adapted fauna. There are no towns or tourist facilities on the island, and visits are generally limited to scientific or carefully organised trips.
San Esteban Island lies in the central Gulf of California within the state of Sonora and is administered by Mexico. Access is by private boat from the Sonoran mainland.
- Endemic wildlife: Home to at least one endemic reptile species, the island is ecologically notable and has no permanent civilian population.
Best Time to Visit San Esteban Island
Aim for spring through late summer when sea conditions are gentler and wildlife viewing is at its best.
Weather & Climate near San Esteban Island
San Esteban Island's climate is classified as Hot Desert - Hot Desert climate with hot summers (peaking in August) and cool winters (coldest in January). Temperatures range from 9°C to 33°C. Very dry conditions with minimal rainfall with a pronounced dry season.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | 9° - 19° | 14° | 12 mm | - | - | 2.8 m/s | - | - |
| February | - | 9° - 20° | 15° | 7 mm | - | - | 2.9 m/s | - | - |
| March | - | 10° - 22° | 16° | 4 mm | - | - | 3.0 m/s | - | - |
| April | - | 12° - 24° | 18° | 1 mm | - | - | 3.1 m/s | - | - |
| May | - | 15° - 27° | 21° | 0 mm | - | - | 3.0 m/s | - | - |
| June | - | 19° - 31° | 25° | 1 mm | - | - | 3.1 m/s | - | - |
| July | - | 24° - 33° | 28° | 13 mm | - | - | 3.0 m/s | - | - |
| August | - | 24° - 33° | 29° | 27 mm | - | - | 2.8 m/s | - | - |
| September | - | 23° - 33° | 28° | 26 mm | - | - | 2.7 m/s | - | - |
| October | - | 18° - 29° | 23° | 10 mm | - | - | 2.8 m/s | - | - |
| November | - | 13° - 23° | 18° | 6 mm | - | - | 2.9 m/s | - | - |
| December | - | 10° - 20° | 15° | 19 mm | - | - | 3.0 m/s | - | - |
How to Get to San Esteban Island
Boat charters depart from Sonoran ports; scheduling depends on local operators in Puerto Peñasco and other Gulf harbours. Visits are generally day trips due to the island’s lack of facilities.
Tips for Visiting San Esteban Island
- If visiting for wildlife, bring a guide familiar with the Gulf of California's currents and protected-area restrictions.
- Respect local fishing rules and protected zones; much of the sea life is fragile and regulated.