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Galapagos Island Climate and Weather Patterns



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Climate of Galapagos (Usual Patterns)

Hot Season (warm-rainy) - From December through May

  • Air Temperature: Average air temperature in December is 25.4°C ( 77°F ), while in May is 26.8°C ( 80°F ). Peak month is March with 29.1°C ( 84°F ). Humidity fluctuates between 65% to 80%.
  • Water Temperature: Average surface water temperature in December is 23.2°C ( 74°F ), while in May is 24.5°C ( 76°F ). Peak month is March with 25.5°C (78°F). Visibility of the water ranges from 30 to 80 feet. In unusually warm years (like El Niño years) waters can even reach 29°C (84°F).
  • Precipitation (rainfall): ranges from 38 mm (December) to 62 mm (May), with its peak rainy at 87 mm (March).
  • Overall pattern: while this season is the one that gives rain to the islands, it should not be sold as the "rainy" season. Tropical showers are not too overwhelming, and a typical day may include a shower or two that will only last for an hour or so. There are times where for a whole week not a raindrop is experienced. The ocean is generally calm due to the absence of the south east trade winds.
  • Biological implications: all species which are land-based (like finches, mockingbirds, lizards, land iguanas, tortoises) will reproduce at this time of the year since there are plenty of food sources available: plants for insects, seeds for finches, flowers for iguanas, etc. Perhaps one of the few exceptions to this rule are the Great Frigate birds on Tower Island which being seabirds reproduce during the hot season.
  • Snorkeling conditions: since the water temperature reaches the "true" tropical range, one can expect generally calm waters, virtually no strong currents, and high chances of good visibility. Daily activities will be arranged in such a way that guests spend a great amount of time snorkeling as our way to add enjoyment to this marine resource. Most snorkeling times will be of no less than 90 minutes.

Dry Season (windy-dry) - From June through November

  • Air Temperature: Average air temperature in June is 25.2°C ( 77°F ), while in November is 24.4°C ( 76°F ). Peak month is September with 23.1°C ( 74°F ). Humidity fluctuates between 35% - 60%.
  • Water Temperature: Average surface water temperature in June is 23.3°C ( 74°F ), while in November is 22.8°C ( 73°F ). Peak month is September with 21.6°C (70°F) . Visibility of the water ranges from 15 to 50 feet. In unusually dry years (like La Niña years) waters can even reach 16°C (61°F).
  • Precipitation (rainfall): ranges only from 35 mm (June) to 13 mm (November), with its peak dry at 9.9 mm (September).
  • Overall pattern: this season is the one that gives the islands their totally non tropical look: dry, windy, barren. Even though the term "cold" season is sometimes applied, remember that such term does not sell a destination that is geographically tropical. There's hardly any rain, but the islands may seem somewhat moist as an early mist called "garua" covers the sky. Usually this layer of fine drizzle burns off by mid morning. The seas are moderately strong; surge, choppy waters and some waves should be expected. This is all due to the active presence of the south east trade winds.
  • Biological implications: all species which are land-based, but depend entirely upon the ocean's productivity (food available, like plankton) will reproduce during this season. This includes blue-footed boobies, waved albatrosses, sea lions.
  • Snorkeling conditions: since the water temperature reaches the "untrue" tropical range, one can expect generally waters with some current, and a slight decrease in visibility due to the amount of plankton particles suspended in the water column. This is the snorkeling season where a shortie wet suit is more likely to provide higher comfort in the water for our guests. Note that shortie wet suits are available for rent on some of our vessels.

 

Galapagos Natural Facts

The islands emerged about five million years ago, give or take a million, as a result of violent volcanic action. In geological terms, this should be considered a recent event.

As the young islands were cooling off, say, two million years later, some species gradually arrived. They were live organisms riding on "rafts of vegetation" from the shores of Central and South America. Unusual climatic events, like flooding, can take lots of vegetation rafts eventually to the ocean. Therefore, it is pure chance that allows a raft to eventually reach Galápagos. These early immigrants had to adapt to a peculiar new environment, and simply evolved -- slowly -- in a different direction from their continental ancestors. And, wonders of nature, they developed into species unique to the islands, with features not seen in their past ancestors.

 

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