Stithians Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Stithians Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Stithians Reservoir today is 14.2°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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 3 | 14.4°C | 20.0°C | |
| JUN 4 | 14.3°C | 20.0°C | |
| JUN 5 | 14.3°C | 20.0°C | |
| JUN 6 | 14.3°C | 20.0°C | |
| JUN 7 | 14.4°C | 20.0°C | |
| JUN 8 | 14.4°C | 20.0°C | |
| JUN 10 | 14.3°C | 20.0°C | |
| JUN 11 | 20.0°C | 14.5°C | |
| JUN 12 | 20.0°C | 14.8°C | |
| JUN 13 | 20.0°C | 15.1°C | |
| JUN 14 | 20.0°C | 15.4°C | |
| JUN 15 | 20.0°C | 15.7°C | |
| JUN 16 | 20.0°C | 15.9°C | |
| JUN 17 | 20.0°C | 16.2°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.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 4°C | 8°C | 11°C |
| February | 4°C | 8°C | 11°C |
| March | 5°C | 9°C | 12°C |
| April | 7°C | 11°C | 14°C |
| May | 7°C | 12°C | 18°C |
| June | 14°C | 20°C | 25°C |
| July | 16°C | 21°C | 26°C |
| August | 17°C | 22°C | 27°C |
| September | 12°C | 18°C | 23°C |
| October | 7°C | 11°C | 14°C |
| November | 5°C | 9°C | 12°C |
| December | 4°C | 8°C | 11°C |
Stithians Reservoir: Water Temperature by Location
Stithians Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
#Cornwall
Stithians Reservoir’s surface water temperatures vary through the year with spring typically around 8–12 °C (46–54 °F), summer commonly warming to about 14–20 °C (57–68 °F), autumn cooling to roughly 10–14 °C (50–57 °F), and winter often falling to 4–8 °C (39–46 °F). As with many upland Cornwall reservoirs, temperatures can change with depth, weather and sunlight, so surface readings in warm spells may feel pleasant while deeper water remains cold.
Open wild swimming at Stithians is generally not permitted because the site is a working water supply and carries risks from cold, submerged hazards and lack of lifeguards; these restrictions help protect water quality and visitor safety. The reservoir does support organised watersports, angling and sailing through clubs and authorised operators, which provide supervised access. Nearby attractions include the village of Stithians and surrounding countryside, walking trails, birdwatching spots and Cornwall’s historic mining landscapes, while coastal beaches and harbour towns such as Falmouth are within a short drive for those seeking sea swimming.