If you're looking for summer vibes, the best time to travel to Terceira, Island is in July, August and September, when the average temperature reaches 22.11 °C, while June, August and July are the 3 sunniest months of the year, with an average of 39.55 hours.
However, if you prefer colder temperatures, make sure you visit Terceira, Island during January, February or March to experience an average of 12.47 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during February, May and June, when the average precipitation in Terceira, Island is 7.5 mm, while the months of January, February and March are drier, with an average of 0 mm.