Mattapoisett — Water Temperature in July

Water Temperature Range

15°C

minimum

21°C

average

24°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
JUL 1	20°C	19°C	23°C	21°C
JUL 2	20°C	19°C	22°C	21°C
JUL 3	20°C	19°C	21°C	21°C
JUL 4	20°C	20°C	20°C	21°C
JUL 5	20°C	20°C	21°C	20°C
JUL 6	20°C	20°C	20°C	19°C
JUL 7	21°C	20°C	21°C	20°C
JUL 8	20°C	20°C	21°C	20°C
JUL 9	20°C	21°C	20°C	21°C
JUL 10	21°C	21°C	21°C	21°C
JUL 11	20°C	20°C	20°C	21°C
JUL 12	20°C	20°C	20°C	21°C
JUL 13	21°C	20°C	21°C	22°C
JUL 14	21°C	20°C	20°C	21°C
JUL 15	21°C	20°C	21°C	21°C
JUL 16	21°C	21°C	21°C	22°C
JUL 17	21°C	22°C	22°C	21°C
JUL 18	21°C	22°C	21°C	22°C
JUL 19	22°C	22°C	22°C	21°C
JUL 20	22°C	21°C	23°C	21°C
JUL 21	22°C	21°C	22°C	22°C
JUL 22	22°C	21°C	23°C	22°C
JUL 23	22°C	21°C	22°C	23°C
JUL 24	22°C	21°C	23°C	23°C
JUL 25	22°C	21°C	23°C	23°C
JUL 26	22°C	21°C	21°C	23°C
JUL 27	22°C	21°C	22°C	23°C
JUL 28	22°C	21°C	22°C	24°C
JUL 29	22°C	21°C	23°C	24°C
JUL 30	22°C	22°C	23°C	24°C
JUL 31	22°C	22°C	22°C	24°C

July: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

23 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

10 hrs

Average Wind Speed

16 km/h

Average Humidity

72%

With such a ratio between the average monthly temperatures of water and air, swimming can feel slightly cool at first but still quite doable. It’s more comfortable if the sun is out, and you may want a towel or hoodie right after.