Rosslyn — Water Temperature in July

Water Temperature Range

18°C

minimum

21°C

average

22°C

maximum

Water Temperature Chart for July

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

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

Climate and Swimming Opportunities in Rosslyn in July

Average Day Air Temperature

21°C

Average Night Air Temperature

13°C

Precipitation Amount per Month

56 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

7 hrs

Average Wind Speed

13 km/h

Average Humidity

59%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.