Terceira has a temperate maritime climate with mild winters and warm summers. Being close to the Ocean humidity is usually high through out the year with higher temperatures in July to September. The annual temperature is around 13-15 C.
The best time for Terceira holidays is usually between May and September with nice sunny days. The best of the flora is at its bloom in May, June and August where as September is the best time to see some of the most exquisite marine animals and sea birds.