St Lawrence — Water Temperature in July

Water Temperature Range

14°C

minimum

17°C

average

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

July: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

22°C

Precipitation Amount per Month

47 mm

Number of Rainy Days

Daylight per Day

16 hrs

Sunshine per Day

6 hrs

Average Wind Speed

14 km/h

Average Humidity

80%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.