Ponta Delgada, where it's located

The climate of Ponta Delgada is temperate oceanic, with mild, rainy winters and pleasantly warm summers.
The city is the capital of the Azores and is located on the southern coast of the island of São Miguel.The highest peak on the island is Pico da Vara, 1,103 meters (3,619 feet) high.
The average temperature of the coldest month (February) is of 14.1 °C (57 °F), that of the warmest month (August) is of 22.2 °C (72 °F). The lowest record (of the 1971/2000 period) is 3.5 °C (38 °F), the highest is 28.8 °C (84 °F). Here are the average temperatures.
Ponta Delgada - Average temperatures
Min (°C)121212121416181918161413
Max (°C)171717181921242524221918
Min (°F)545454545761646664615755
Max (°F)636363646670757775726664

Precipitation amounts to 970 millimeters (38.2 inches) per year: so, it is at an intermediate level. It ranges from 25 mm (1 in) in the driest month (July) to 120 mm (4.7 in) in the wettest ones (November, December). Here is the average precipitation.
Ponta Delgada - Average precipitation

On average, there are around 1,740 sunshine hours per year. Here are the average sunshine hours per day.
Ponta Delgada - Sunshine

The sea temperature ranges between 16 °C (61 °F) and 23 °C (73 °F). The sea is never very warm, though it is warm enough for swimming from July to September. Here are the average sea temperatures.
Ponta Delgada - Sea temperature
Temp (°C)171616171820222323211918
Temp (°F)636161636468727373706664

Ponta Delgada

Best Time

The best time to visit Ponta Delgada runs from June to August, since it is the warmest and the least rainy period of the year. In May, you can go, but cool and rainy days are more frequent.
Even in summer, it's better to bring a sweatshirt, and maybe a light jacket for the evening.