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Nantucket Sea Temperature in July

Massachusetts, United States

June Nantucket year-round → August

Average sea temperature for Nantucket, United States across July, based on 10 years of daily readings.

Average

20.81° C

High

23.48° C

Low

17.51° C

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

July is the 2nd warmest of 12 months at Nantucket. On average the water sits 8.9° than the year-round mean of 11.87° C.

Compared to June, July is 4.4° warmer than (16.43° C in June). By August the water is usually 21.64° C.

Nantucket Day-by-Day Water Temperature in July

10-year low, average and high

16.5° C
18.5° C
20.5° C
22.5° C
24.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through July. Range Average

Each vertical bar above is one day of July. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Nantucket.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

July Water Temperature Table for Nantucket

10-year daily averages

Day Average Low High
July 1 19.41° C 18.41° C 21.08° C
July 2 19.61° C 18.66° C 21.42° C
July 3 19.8° C 18.81° C 20.9° C
July 4 19.97° C 19° C 20.61° C
July 5 20.16° C 19.2° C 20.97° C
July 6 20.11° C 18.98° C 21.37° C
July 7 20.09° C 19.48° C 20.85° C
July 8 20.09° C 18.94° C 20.93° C
July 9 19.91° C 19.25° C 20.66° C
July 10 20.13° C 19.31° C 20.46° C
July 11 20.34° C 19.42° C 21.08° C
July 12 20.41° C 19.57° C 20.93° C
July 13 20.51° C 19.66° C 21.09° C
July 14 20.65° C 19.44° C 21.4° C
July 15 20.93° C 19.58° C 21.91° C
July 16 21.11° C 19.91° C 22.21° C
July 17 21.28° C 19.78° C 22.19° C
July 18 21.41° C 19.82° C 22.2° C
July 19 21.29° C 20.09° C 22.3° C
July 20 21.39° C 19.96° C 22.98° C
July 21 21.43° C 19.57° C 23.18° C
July 22 21.49° C 19.95° C 23.1° C
July 23 21.45° C 19.86° C 22.89° C
July 24 21.41° C 18.95° C 22.68° C
July 25 21.28° C 17.51° C 23.04° C
July 26 21.32° C 18.37° C 22.91° C
July 27 21.55° C 19.57° C 23.19° C
July 28 21.65° C 19.56° C 23.21° C
July 29 21.68° C 18.58° C 23.21° C
July 30 21.58° C 18.15° C 23.19° C
July 31 21.8° C 19.42° C 23.48° C

Where July Sits in the Year

July highlighted

-2.5° C
4.9° C
12.3° C
19.6° C
27.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
4.27° C
3.2° C
4.2° C
7.08° C
11.06° C
16.43° C
20.81° C
21.64° C
19.77° C
15.86° C
11.19° C
6.95° C
10-year monthly history for Nantucket. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in July

Compare other United States water for the same month

Nantucket Location

41.2835, -70.0995

41.28347, -70.09945 View on OpenStreetMap →

Nantucket sits at 41.2835°N, 70.0995°W, on the coast of Massachusetts, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Nantucket