Main image

Helder da Rocha from Sao Paulo, Brazil CC BY-SA 4.0 Wikimedia Commons

Ilha das Cobras

Island

A small island in Rio de Janeiro's harbour, visible from Guanabara Bay; boat tours point it out for its naval facilities and historic fortifications rather than public access.

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In this guide

Ilha das Cobras essentials

Address: Ilha das Cobras, Guanabara Bay, Rio de Janeiro, Brazil
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About Ilha das Cobras

Ilha das Cobras is a small island in Guanabara Bay, Rio de Janeiro, Brazil, situated close to the city centre and the main port area. It is notable for hosting Brazilian naval facilities rather than tourist amenities.

The island is not primarily a public visitor destination; its shoreline and built structures are largely occupied by military and naval installations. It is best appreciated from viewpoints along the Rio waterfront and harbour rather than by visiting the island itself.

Historically the island has been associated with naval activity and defence of the harbour; it contains longstanding shipyard and base facilities maintained by the Brazilian Navy. Public access has been limited because of these uses.

Geographically the island sits inside Guanabara Bay immediately off downtown Rio de Janeiro, adjacent to the main harbour and port terminals and visible from central waterfront areas such as Praça Mauá.

  • Visibility and access: Located within Guanabara Bay immediately adjacent to downtown Rio de Janeiro, making it clearly visible from the city waterfront but generally not open for public visits due to naval use.

What to See#

  • Naval Arsenal: A Brazilian Navy shipyard and base that occupies much of the island and its waterfront, used for naval maintenance and operations in Guanabara Bay.
Things to Do
When to Go

Best Time to Visit Ilha das Cobras

Best seen from the Rio waterfront during the dry season; direct access is restricted due to naval installations.

Dry season
May-September · 18-26°C
Clearer skies and more comfortable conditions for viewing from the city.
Shoulder months
April & October · 20-28°C
Milder temperatures with fewer tourists on waterfront promenades.

Weather & Climate near Ilha das Cobras

Climate

Subtropical climate with hot summers (peaking in February) and warm winters (coldest in July). Temperatures range from 16°C to 32°C. Abundant rainfall (1115 mm/year), wettest in March.

Air Quality: AQI 57 Moderate
Temperature & Rainfall
Temperature Range
32°
Warmest Month
16°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January - 21° - 31° 26° 139 mm - - 2.6 m/s - -
February - 21° - 32° 27° 139 mm - - 2.7 m/s - -
March - 21° - 31° 26° 149 mm - - 2.5 m/s - -
April - 20° - 29° 24° 125 mm - - 2.3 m/s - -
May - 18° - 27° 23° 82 mm - - 2.3 m/s - -
June - 16° - 27° 21° 54 mm - - 2.2 m/s - -
July - 16° - 27° 21° 45 mm - - 2.3 m/s - -
August - 16° - 27° 22° 40 mm - - 2.7 m/s - -
September - 17° - 27° 22° 53 mm - - 3.0 m/s - -
October - 18° - 28° 23° 75 mm - - 3.2 m/s - -
November - 19° - 29° 24° 84 mm - - 3.1 m/s - -
December - 21° - 30° 25° 130 mm - - 3.1 m/s - -
Getting There & Around

How to Get to Ilha das Cobras

No public landings; best viewed from the waterfront near Praça Mauá, the Museu do Amanhã, or from boat tours of Guanabara Bay (note that boats do not dock on the naval island).

Tips for Visiting Ilha das Cobras

  • View the island from Praça Mauá or the Fortaleza de São João rather than attempting to land; the island hosts naval facilities.
  • Photography is best at low tide when the naval docks and ship silhouettes create dramatic profiles.