Charlestown — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Charlestown (England, United Kingdom). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Charlestown help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Charlestown in the English Channel today is 13°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear.
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 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 Charlestown will be 14.7°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 5 | 15.6°C | 14.0°C | |
| JUN 6 | 15.5°C | 14.0°C | |
| JUN 7 | 14.9°C | 14.0°C | |
| JUN 8 | 14.4°C | 13.8°C | |
| JUN 9 | 14.0°C | 13.8°C | |
| JUN 10 | 13.1°C | 13.8°C | |
| JUN 11 | 13.4°C | 13.8°C | |
| JUN 12 | 13.4°C | 14.0°C | |
| JUN 13 | 13.4°C | 14.0°C | 13.4°C |
| JUN 14 | 14.0°C | 13.6°C | |
| JUN 15 | 14.5°C | 13.8°C | |
| JUN 16 | 14.3°C | 14.0°C | |
| JUN 17 | 14.5°C | 14.2°C | |
| JUN 18 | 15.0°C | 14.4°C | |
| JUN 19 | 15.3°C | 14.5°C | |
| JUN 20 | 15.3°C | 14.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
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.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 9°C | 11°C | 12°C |
| February | 8°C | 10°C | 12°C |
| March | 8°C | 9°C | 12°C |
| April | 9°C | 10°C | 13°C |
| May | 10°C | 12°C | 15°C |
| June | 12°C | 15°C | 18°C |
| July | 13°C | 17°C | 20°C |
| August | 15°C | 17°C | 19°C |
| September | 15°C | 16°C | 19°C |
| October | 13°C | 15°C | 17°C |
| November | 12°C | 14°C | 16°C |
| December | 10°C | 12°C | 14°C |
* Click on a month to view detailed water temperature data.
Charlestown: Weather Forecast
June 14
June 15
June 16
June 17
Location, Beaches & Local Information
Nearby Beaches & Facilities
Charlestown Beach
Duporth Beach
Porthpean Beach
Crinnis Beach
Carlyon Bay
Polgaver Beach
Spit Beach Par
Pentewan Sands Beach
Polkerris Beach
Swimming Conditions
Swimming and beach holidays around Charlestown suit those prepared for cooler sea temperatures and varied coastal conditions. Charlestown’s small harbour and nearby shores offer places for a paddle or a sea swim when conditions are calm, while sandier stretches and sheltered coves a short drive away provide more conventional beach options. Summer months are the most comfortable for open-water bathing without heavy thermal protection, but many visitors use wetsuits for longer swims or shoulder-season dips. The area also supports kayaking, coastal walks and boat trips that let visitors enjoy the harbour and coastline without prolonged immersion. As currents and weather can change quickly, swimmers should check local advice and tide information before entering the water and choose sites appropriate to their experience.