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Weather on Nantucket



The Gulf Stream makes the climate of Nantucket, milder than than that of Massachusetts Bay, which is isolated from its effects by Cape Cod. Our average temperatures are;

January
high 40of 4oc
low 26of -3oc

May
high 62of 17oc
low 48of 9oc

September
high 70of 21oc
low 66of 19oc

February
high 41of 5oc
low 26of -3oc

June
high 71of 22oc
low 58of 14oc

October
high 59of 15oc
low 47of 8oc

March
high 42of 6oc
low 32of 0oc

July
high 78of 25oc
low 63of 17oc

November
high 48of 9oc
low 37of 3oc

April
high 53of 12oc
low 40of 4oc

August
high 76of 24oc
low 61of 16oc

December
high 40of 4oc
low 26of -3oc


Average Monthly Water Temperatures
as compiled by Dan Kelliher

January
32o

February
34o

March
37o

April
47o

May
58o

June
67o

July
73o

August
75o

September
68o

October
58o

November
48o

December
35o


Average Monthly Humidity
as compiled from city data

January
60-70%

February
56-71%

March
55-72%

April
50-70%

May
55-73%

June
57-75%

July
57-78%

August
58-80%

September
58-82%

October
55-79%

November
58-76%

December
59-73%

Data provided by the Nantucket Chamber of Commerce.