The Galapagos Islands have a warm and relatively dry climate year round, with temperatures ranging from 22ºC to 28ºC. Climate in the Galapagos Islands is  moderated both by the ocean currents and affected by altitude. There is a six-month-long dry period during which it rarely rains, with cooler temperatures, while the months of January through May are more humid and hotter.

The rainy season begins in January and runs until May. Unlike the name suggests it, the weather is typically warm and sunny. The water temperatures reach a comfortable 75º F (24º C), and occasional tropical rainstorms can occur, which will only last for an hour or two. March and April are generally considered the best months for visiting the islands. When the weather is warm, the winds are light, the sea is calm, and the birds are nesting. Snorkeling conditions are at their best, with high chance of visibility, no strong currents and calm waters.

After April, the weather becomes cooler. June to November marks the dry season. Temperatures become cooler and the skies cloudier. There's hardly any rain, but the islands may seem somewhat moist as an early mist sets in the morning hours to disappear by mid-day. Water temperatures drop to 70º F (21ºC) or below and the south east trade winds can make the water choppy.

August and September are months with little sun, quite cold, and the water the roughest. November is the best month to visit as the weather is getting progressively better. Snorkeling conditions are not as good, with a reduced visibility due to strong marine currents, and cooler waters doesn’t make it as comfortable as during the rainy season.