Weather and Climate

Temperatures on Nantucket vary greatly throughout the year. On average in July and August the highs reach about 75 F and the ocean temperature hovers in the low 60's. Evening temperatures can drop quite a bit and ocean breezes can make it chilly.

Average Temperatures

January
High 40 F
Low 26 F

February
High 41 F
Low 26 F

March
High 42 F
Low 32

April
High 53 F
Low 40 F

May
High 62 F
Low 48 F

June
High 71
Low 58

July
High 78 F
Low 63 F

August
High 76 F
Low 61

September
High 70 F
Low 66 F

October
High 59 F
Low 47 F

November
High 48 F
Low 37 F

December
High 40 F
Low 26 F