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 11.9°C. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

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.

53.4

°F

May 7, 01:19

Trend:

increasing

Yesterday:

53.3°F

Tomorrow:

53.6°F

Sunrise:

05:33

Sunset:

20:56

Day Length:

15 h. 23 min.

Caernarfon in May

Minimum:

46.5°F

Average:

48.0°F

Maximum:

49.9°F

Sea water temperature in Caernarfon today

As of now, in Caernarfon, the water temperature is 53.4°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 2.0°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 53.1°F on 2025, while the historical minimum was 49.5°F on 2016.

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. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 53.9°F, with minimum temperature starting at 53.6°F, while the maximum might reach 54.7°F.

Daily water temperature in Caernarfon

Date	Current Year actual* / forecast**	last year	10 years average
Apr 23	50.5°F	50.6°F	50.1°F
Apr 24	51.3°F	51.2°F	50.2°F
Apr 25	51.9°F	51.1°F	50.4°F
Apr 26	52.2°F	51.0°F	50.6°F
Apr 27	52.4°F	52.2°F	50.5°F
Apr 28	52.8°F	52.1°F	50.6°F
Apr 29	52.8°F	52.0°F	50.6°F
Apr 30	52.6°F	51.9°F	50.6°F
May 1	53.0°F	52.8°F	50.8°F
May 2	52.5°F	53.8°F	51.0°F
May 3	52.4°F	53.8°F	51.0°F
May 4	53.6°F	53.6°F	51.2°F
May 5	53.5°F	53.7°F	51.4°F
May 6	53.3°F	53.4°F	51.3°F
May 7	53.4°F	53.1°F	51.5°F
May 8	53.6°F	53.9°F	51.6°F
May 9	53.7°F	53.5°F	51.8°F
May 10	53.7°F	53.4°F	51.7°F
May 11	53.7°F	53.4°F	51.7°F
May 12	53.8°F	53.5°F	51.8°F
May 13	54.4°F	55.2°F	52.5°F
May 14	54.7°F	55.8°F	52.7°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 July 22, 2021, reaching a 66.9°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, 60.2°F in Summer, and 57.3°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Bangor	52.0°F	8mi
Holyhead	51.4°F	19mi
Conwy	53.2°F	21mi
Aberystwyth	53.2°F	51mi

* current water temperature in this city

** straight line distance from Caernarfon