The Galapagos Islands have a sub-tropical climate with two seasons; the rainy season and the dry season. Ocean currents are largely responsible for the climate of the islands. Though located on the equator the temperatures are much milder then one would imagine due to the cold current traveling north from Antarctica .
The rainy season runs from November until June . Unlike the name suggests the weather is typically warm and sunny with daytime air temperatures between 77-87F (26-30C) . The water temperatures reach a comfortable 75º F (24º C ), and occasional tropical rainstorms can occur. February, 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. In the Highland areas, the temperatures will be fresher (4- 5C cooler than on the coastline) and both cloudy and sunny skies will be experienced.
After April the weather becomes cooler. July to November marks the dry season. Temperatures become cooler (75-77F, 24-25C) and the skies cloudier although it seldom rains. Water temperatures drop to 70º F (21ºC) or below and the winds can make the water choppy. A sweater or jacket may be necessary on cloudy days and at night. August and September tend to be considered the "worst" months to visit when there is little sun, it can be quite cold, and the water the roughest. In the Highland areas, the "Garua" (fine mist and clouds) season is experienced regularly over high ground at this time of the year.