Because the Galápagos is set on the equator, it is a true year-round destination with seasonal temperatures varying only slightly. The best time to go is really up to the demands of your schedule. The Galápagos have a subtropical climate regulated by the cold Humboldt Current and the warm El Niño Current.
December through May is the warmest time of year, with air temperatures in the upper 80°s F (31° degrees Celsius). Although the islands receive slightly more rainfall during this time, the lower elevations typically offer blue skies and sunshine with occasional haze. The sea is at its warmest and is usually calmer during this time of year.
The drier garua season lasts from June through November. The garua is a cloud layer that forms over the highlands of the islands. Ironically, the garua season provides more moisture at the upper elevations of the islands than the so-called wet season. There may be plenty of sunshine during the day, but it is less intense, with cloudier skies. Air temperature is lower, with highs in the upper 70°s or mid-80°s F (25 - 30 degrees Celsius). The strong Antarctic Humboldt Current, coming from the south, affects the climate at this time of year. The water temperature, therefore, is at its coolest, about 68° degrees Fahrenheit, 20 degrees Celsius.