All data are in degrees Fahrenheit


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



July 14, 05:27











Day Length:

16 h. 29 min.

Caernarfon in July







Sea water temperature in Caernarfon today

As of now, in Caernarfon, the water temperature is 60.4°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 about the same as 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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 62.8°F on 2022, while the historical minimum was 58.2°F on 2015.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 60.8°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
Jun 30 59.4°F 61.3°F 58.8°F
Jul 1 58.9°F 61.1°F 58.8°F
Jul 2 59.4°F 61.4°F 59.0°F
Jul 3 59.3°F 61.1°F 59.0°F
Jul 4 59.1°F 61.0°F 59.0°F
Jul 5 60.3°F 61.6°F 59.2°F
Jul 6 60.0°F 61.3°F 59.2°F
Jul 7 60.0°F 60.9°F 59.4°F
Jul 8 59.5°F 61.4°F 59.5°F
Jul 9 59.6°F 60.7°F 59.5°F
Jul 10 59.5°F 60.9°F 59.7°F
Jul 11 59.6°F 61.1°F 60.1°F
Jul 12 59.5°F 61.2°F 60.0°F
Jul 13 60.1°F 62.0°F 60.2°F
Jul 14 60.4°F 61.8°F 60.5°F
Jul 15 60.4°F 61.2°F 60.4°F
Jul 16 60.5°F 61.0°F 60.5°F
Jul 17 60.7°F 61.1°F 60.7°F
Jul 18 60.9°F 61.2°F 61.0°F
Jul 19 60.9°F 60.0°F 61.0°F
Jul 20 61.0°F 59.8°F 61.1°F
Jul 21 61.1°F 60.3°F 61.2°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 47.5°F in Winter, 49.0°F in Spring, 59.8°F in Summer, and 57.4°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Bangor 59.4°F 8mi
Holyhead 59.1°F 19mi
Conwy 60.2°F 21mi
Aberystwyth 62.0°F 51mi

* current water temperature in this city

** straight line distance from Caernarfon