The weather in Ecuador is exceptionally difficult to predict. The diverse landscape creates countless micro-climates that cause varied weather in neighboring geographical locations. Although there are some seasonal weather variations, these conditions generally do not limit travel to any particular time of the year. The more popular travel periods correspond more to vacation schedules in North America and Europe than any particular season within the country itself.
There are two seasons in Galapagos, but climate is tempered year-around on the equator. The "warm" season runs from January through April with air temperatures ranging from 65° F-81° F (water temperatures 76° F-83° F). Skies are clear, blue and interspersed with sporadic rains. This season offers the most pleasant weather and calm seas. It is the best season for cruising. From May through December, the Humboldt current predominates, cooling air temperatures slightly to between 60° F - 72° F (water temperatures 65° F-72° F) and creating comfortable hiking weather. Although the sea is rarely ever rough, southeast trade winds cause the ocean to be choppier this time of year and a misty "garua" fog may linger part of the day. Since climate in Galapagos depends so much on shifting ocean currents, local weather varies from year to year.
The valleys and surrounding hillsides of Quito are situated in the Andes at an altitude of 9,000 feet. Climate is Spring-like throughout the year with variations ranging from occasional hail showers and cold temperatures at night, to very typical warm and sunny days. Daytime temperatures average 67° F and evening average is 50° F. Expect more rainfall in this region of the Andes from October to May when precipitation consistently falls for a few hours in the afternoon and the lush agricultural hillsides are a vibrant green.
If your travels take you to the Amazonian rain forest, be prepared for rain any time of the year, especially from March to October.