Conwy — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming.

It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart Over the Last 30 Days

Water temperature in Conwy rose over the last 30 days but fell over the last week. Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Conwy will be 16.8°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Conwy sits on the north coast of Wales where the Conwy estuary meets the Irish Sea, so water temperatures reflect both sheltered estuary conditions and the cooler open sea. Typical winter sea temperatures around Conwy range from about 7–9 °C, rising slowly through spring to roughly 8–12 °C by late spring. Summer months bring the warmest conditions, generally between 12–18 °C, with the highest values often seen in shallower, sheltered bays and the estuary itself. Autumn sees a gradual cooling, with sea temperatures usually between 10–14 °C, although short warm spells or cold snaps can push values outside these bands. Local factors such as tidal range, wind direction and recent weather can cause noticeable day-to-day variation, and shallow areas warm faster while deeper channels remain cooler.