Water temperature in Caernarfon in August

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Is it warm enough to swim in Caernarfon in August? Average water temperature in Caernarfon in August is 16.3°C and therefore is not suitable for comfortable swimming. The warmest sea in Caernarfon in August is 19.4°C, and the coldest is 14.6°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Caernarfon

Changes water temperature in Caernarfon in August 2025, 2024

To get an accurate forecast for the water temperature in Caernarfon for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Caernarfon, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 August	17.1°C	18°C	14.6°C	18°C
2 August	17.5°C	17.6°C	14.7°C	17.6°C
3 August	17.4°C	17.8°C	14.8°C	17.8°C
4 August	17.7°C	17.5°C	14.9°C	17.7°C
5 August	17.6°C	16.9°C	14.6°C	17.6°C
6 August	17.4°C	16.7°C	15°C	17.6°C
7 August	17.5°C	16.7°C	15°C	18°C
8 August	17.5°C	16.6°C	15.1°C	18.7°C
9 August	17.7°C	16.8°C	14.9°C	18.8°C
10 August	17.3°C	17°C	15.2°C	19.4°C
11 August	18.2°C	17.3°C	15.2°C	19.2°C
12 August	18.8°C	17.1°C	15.3°C	19.3°C
13 August	18.8°C	16.6°C	15.3°C	18.9°C
14 August	19.1°C	16.6°C	15.1°C	19.1°C
15 August	19.1°C	16.5°C	15.3°C	19.1°C

Day	2025	2024	Min	Max
16 August	19.2°C	16.5°C	15.3°C	19.2°C
17 August	18.8°C	17°C	15.5°C	18.8°C
18 August	18.6°C	16.4°C	15.6°C	18.6°C
19 August	18.8°C	16.5°C	15.6°C	18.8°C
20 August	18.5°C	16.7°C	15.4°C	18.5°C
21 August	18.4°C	16.6°C	15.5°C	18.4°C
22 August	18.1°C	16.4°C	15.5°C	18.1°C
23 August	18.2°C	16.4°C	15.6°C	18.2°C
24 August	18.5°C	16.3°C	15.6°C	18.5°C
25 August	18.6°C	16.1°C	15.4°C	18.6°C
26 August	18.8°C	16°C	15.6°C	18.8°C
27 August	18.4°C	15.9°C	15.6°C	18.4°C
28 August	18.1°C	16.1°C	15.6°C	18.1°C
29 August	18.2°C	16.3°C	15.6°C	18.2°C
30 August	17.8°C	16.3°C	15.6°C	17.8°C
31 August	17.5°C	16.1°C	15.6°C	17.8°C

Average water temperature in Caernarfon in August over a decade

2016	2017	2018	2019	2020
16°C	16°C	16.6°C	16.7°C	16.6°C

2021	2022	2023	2024	2025
17°C	18°C	16.9°C	16.7°C	17.5°C

Caernarfon sea state in August

Chart comparing the height of waves in Caernarfon in August over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Caernarfon water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Newborough	16.3°C	14.6°C	19.3°C
Dinas Dinlle	16.3°C	14.6°C	19°C
Criccieth	17.6°C	16.1°C	20.6°C
Pwllheli	17.3°C	15.7°C	20.3°C
Morfa Nefyn	16.2°C	14.6°C	18.4°C
Trearddur Bay	15.8°C	14.2°C	17.3°C
Black Rock Sands	17.7°C	16.1°C	20.6°C
Morfa Bychan	17.7°C	16.1°C	20.6°C
Penmaenmawr	16.5°C	14.9°C	18.9°C
Amlwch	15.8°C	14.3°C	17.3°C

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Our report for Caernarfon is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature