Belfast — Water Temperature in August

Water Temperature Range

13°C

minimum

15°C

average

18°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	2026	2025	2024	2023
AUG 1	-10°C	16°C	13°C	14°C
AUG 2	16°C	15°C	14°C	14°C
AUG 3	16°C	15°C	14°C	14°C
AUG 4	16°C	15°C	14°C	14°C
AUG 5	17°C	15°C	14°C	15°C
AUG 6	16°C	15°C	14°C	15°C
AUG 7	16°C	15°C	14°C	15°C
AUG 8	17°C	16°C	15°C	16°C
AUG 9	18°C	16°C	15°C	16°C
AUG 10	18°C	16°C	16°C	16°C
AUG 11	18°C	16°C	15°C	16°C
AUG 12	18°C	15°C	14°C	15°C
AUG 13	18°C	16°C	14°C	16°C
AUG 14	17°C	16°C	14°C	16°C
AUG 15	17°C	16°C	14°C	17°C
AUG 16	17°C	16°C	14°C	17°C
AUG 17	16°C	16°C	14°C	17°C
AUG 18	16°C	16°C	15°C	17°C
AUG 19	16°C	16°C	14°C	16°C
AUG 20	15°C	15°C	13°C	15°C
AUG 21	16°C	15°C	13°C	15°C
AUG 22	16°C	15°C	13°C	16°C
AUG 23	15°C	16°C	14°C	16°C
AUG 24	17°C	16°C	14°C	16°C
AUG 25	17°C	15°C	14°C	16°C
AUG 26	16°C	15°C	14°C	15°C
AUG 27	17°C	15°C	14°C	16°C
AUG 28	18°C	15°C	14°C	17°C
AUG 29	17°C	15°C	14°C	16°C
AUG 30	17°C	14°C	13°C	15°C
AUG 31	17°C	14°C	13°C	15°C

August: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

85 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

5 hrs

Average Wind Speed

16 km/h

Average Humidity

86%

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.