Martha’s Vineyard typically experiences warm, sunny conditions in July, with average high temperatures ranging from the mid-70s to low 80s Fahrenheit (low to mid-20s Celsius). Sea breezes moderate the heat and humidity, creating a pleasant climate. Rainfall is typically moderate and spread throughout the month, with occasional brief showers or thunderstorms. Ocean temperatures are generally comfortable for swimming.
Pleasant summer weather makes July a popular time to visit this island destination. The warm temperatures and sunshine are ideal for outdoor activities such as swimming, boating, fishing, and cycling. Historically, July has marked the height of the tourist season, contributing significantly to the island’s economy. This period offers visitors long daylight hours for enjoying the beaches, exploring the towns, and experiencing the unique cultural attractions.