All data are in degrees Fahrenheit

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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.
Sea temperature in Caernarfon now

52.4

°F

April 27, 23:47

Trend:

stable

Yesterday:

52.2°F

Tomorrow:

52.3°F

Sunrise:

05:53

Sunset:

20:38

Day Length:

14 h. 45 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 52.4°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. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

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 52.2°F on 2025, while the historical minimum was 48.4°F on 2018.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 52.6°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
Apr 13 48.9°F 51.3°F 48.5°F
Apr 14 49.5°F 51.5°F 48.7°F
Apr 15 49.4°F 51.2°F 48.9°F
Apr 16 49.1°F 50.9°F 48.9°F
Apr 17 49.7°F 50.6°F 49.0°F
Apr 18 49.9°F 50.3°F 49.0°F
Apr 19 50.5°F 50.2°F 49.3°F
Apr 20 50.8°F 50.0°F 49.6°F
Apr 21 50.7°F 50.0°F 49.8°F
Apr 22 50.7°F 49.9°F 49.9°F
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 50.4°F
Apr 28 52.3°F 52.1°F 50.3°F
Apr 29 52.4°F 52.0°F 50.4°F
Apr 30 52.4°F 51.9°F 50.4°F
May 1 52.6°F 52.8°F 50.6°F
May 2 52.8°F 53.8°F 50.8°F
May 3 52.9°F 53.8°F 50.9°F
May 4 53.0°F 53.6°F 51.0°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

January

February

March

April

May

June

July

August

September

October

November

December

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 51.3°F 8mi
Holyhead 49.9°F 19mi
Conwy 52.0°F 21mi
Aberystwyth 52.6°F 51mi

* current water temperature in this city

** straight line distance from Caernarfon