Charlestown — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people.

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 Charlestown today is lower than both a week ago and a month ago. Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Charlestown will be 16.9°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

Charlestown in England is a small, historic port on the south coast of Cornwall, renowned for its Georgian harbour and maritime heritage. The sea here is influenced by the Atlantic and local coastal currents, producing relatively cool conditions year-round compared with continental waters. Typical seasonal water temperatures around Charlestown range from about 7–10 °C in winter (December–February), rise to roughly 9–13 °C in spring (March–May), reach their warmest in summer at approximately 14–18 °C (June–August), and then ease back to around 11–15 °C in autumn (September–November). Local weather, wind and tides can cause short-term variations, so these figures represent average conditions rather than exact daily readings.