Marblehead — Water Temperature in July

Water Temperature Range

15°C

minimum

19°C

average

23°C

maximum

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

July: Climate and Swimming Opportunities

Average Night Air Temperature

17°C

Average Day Air Temperature

26°C

Precipitation Amount per Month

92 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

9 hrs

Average Wind Speed

14 km/h

Average Humidity

69%

With such a ratio between the average monthly temperatures of water and air, the swim feels brisk and very refreshing. The air is warm enough to make the cool water easy to handle, especially for short swims.