Swimming in Belfast in august 2025: Average sea temperature in august and tide times in august 2025

Average sea temperature in Belfast in august 2025.

In august, according to seasonal norms, the sea temperature in Belfast is:

Minimum: 57°F

Average: 58°F

Maximum: 59°F

Other useful seasonal weather averages in august:

  • Outside temperature: 54°F to 63°F
  • Most common weather: "Moderate rain at times"
  • The wind blows at 6.8mph
  • It rains a total of 5.9in, over 10 day(s).

Should we swim in Belfast in august?

No... The water temperature in Belfast in august is freezing

You won't be able to swim in Belfast in august! The water temperature is freezing, reaching as low as 57°F (and only 59°F at best)! Our advice: if you are going to Belfast this month, plan to sightsee and forget the beach!

Note also that in august, the climate is tolerable with an average outside temperature of 59°F, 5.9in of precipitation (over 10 days) and 93.51 % humidity.

Water and normal seasonal temperatures in Belfast in august

August
Average sea temperature 58°F
Minimum sea temperature 57°F
Maximum sea temperature 59°F
Average outside temperature 59°F
Maximum outside temperature 65°F
Minimum outside temperature 56°F
Wind speed 12.4mph
Wind temperature 52°F
Precipitation 5.9in
Number of days of rain 10 jour(s)
(32%)
Humidity 94%
Visibility in kilometers 8.6km
Cloud cover 59%
Our opinion freezing swimming

Chart of the tides in august 2025

Tide times in august 2025 in Belfast

Swim elsewhere in Northern Ireland in august

City Average T° Max. T° Our opinion
Derry (Londonderry) in august59°F61°Ffreezing swimming
Portrush in august58°F60°Ffreezing swimming
Portstewart in august58°F60°Ffreezing swimming

Swim in Northern Ireland in august: sea temperature by city

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