What is the current water temperature in Caernarfon?

Q: What is the current water temperature in Caernarfon?

As of now, in Caernarfon, the water temperature is 18.28°C. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

United Kingdom > Caernarfon

Water temperature in Caernarfon

Detailed information about the current water temperature in Caernarfon. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

64.9

°F

August 24, 07:57

Trend:

increasing

Yesterday:

64.8°F

Tomorrow:

65.1°F

Sunrise:

06:12

Sunset:

20:26

Day Length:

14 h. 14 min.

Caernarfon in August

Minimum:

45.6°F

Average:

47.6°F

Maximum:

49.8°F

Sea water temperature in Caernarfon today

As of now, in Caernarfon, the water temperature is 64.9°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 2.6°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 64.5°F on 2025, while the historical minimum was 60.8°F on 2017.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 64.9°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Caernarfon

Date	Current Year actual* / forecast**	last year	10 years average
Aug 10	65.0°F	63.7°F	62.6°F
Aug 11	64.8°F	63.7°F	62.6°F
Aug 12	65.4°F	64.5°F	62.9°F
Aug 13	66.6°F	65.4°F	63.1°F
Aug 14	67.2°F	65.4°F	63.2°F
Aug 15	67.5°F	65.9°F	63.2°F
Aug 16	67.6°F	65.9°F	63.1°F
Aug 17	66.8°F	66.0°F	63.0°F
Aug 18	66.5°F	65.6°F	63.0°F
Aug 19	66.5°F	65.3°F	62.7°F
Aug 20	66.7°F	65.7°F	62.8°F
Aug 21	65.9°F	65.2°F	62.8°F
Aug 22	65.3°F	64.9°F	62.7°F
Aug 23	64.8°F	64.5°F	62.2°F
Aug 24	64.9°F	64.5°F	62.3°F
Aug 25	65.1°F	65.0°F	62.4°F
Aug 26	65.1°F	65.3°F	62.5°F
Aug 27	65.2°F	65.6°F	62.6°F
Aug 28	64.8°F	65.1°F	62.2°F
Aug 29	64.7°F	64.6°F	62.1°F
Aug 30	64.8°F	64.8°F	62.2°F
Aug 31	64.7°F	64.0°F	62.0°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Caernarfon by month

In an average year, Caernarfon offers no days when the water temperature is warm enough to swim comfortably.

The warmest water in Caernarfon was recorded on August 16, 2026, reaching a 67.6°F. While the coldest temperature occurred on March 11, 2018, dipping to 42.3°F. The average readings by season are 47.3°F in Winter, 49.4°F in Spring, 60.5°F in Summer, and 57.3°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Bangor	64.8°F	8mi
Holyhead	62.7°F	19mi
Conwy	65.7°F	21mi
Aberystwyth	67.2°F	51mi

* current water temperature in this city

** straight line distance from Caernarfon