Portstewart — Water Temperature in August

Water Temperature Range

12°C

minimum

14°C

average

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

August: Climate and Swimming Opportunities

Average Night Air Temperature

12°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

100 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

4 hrs

Average Wind Speed

16 km/h

Average Humidity

88%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.