Dumbarton — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Dumbarton, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Dumbarton today is 15.5°C.
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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 25 | 15.1°C | 17.0°C | |
| JUN 26 | 15.1°C | 17.0°C | |
| JUN 27 | 15.9°C | 17.0°C | |
| JUN 28 | 15.9°C | 17.0°C | |
| JUN 29 | 16.0°C | 17.0°C | |
| JUN 30 | 16.3°C | 17.0°C | |
| JUL 1 | 15.5°C | 17.0°C | |
| JUL 2 | 15.5°C | 17.0°C | |
| JUL 3 | 17.0°C | 15.6°C | |
| JUL 4 | 17.0°C | 15.7°C | |
| JUL 5 | 17.0°C | 15.7°C | |
| JUL 6 | 17.0°C | 15.8°C | |
| JUL 7 | 17.0°C | 15.9°C | |
| JUL 8 | 17.0°C | 16.0°C | |
| JUL 9 | 17.0°C | 16.0°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 | 0°C | 3°C | 6°C |
| February | 0°C | 3°C | 7°C |
| March | 1°C | 5°C | 8°C |
| April | 4°C | 7°C | 11°C |
| May | 8°C | 12°C | 17°C |
| June | 12°C | 17°C | 21°C |
| July | 12°C | 17°C | 21°C |
| August | 12°C | 17°C | 21°C |
| September | 9°C | 14°C | 18°C |
| October | 6°C | 9°C | 12°C |
| November | 4°C | 7°C | 11°C |
| December | 0°C | 4°C | 7°C |
Dumbarton: Weather Forecast
July 3
July 4
July 5
July 6
Location & Local Information
Dumbarton is a historic town located where the River Leven meets the Firth of Clyde, an estuarine section of the River Clyde. The water temperature here is heavily influenced by the sea, and remains cold throughout the year. Average winter lows fall to approximately 6 to 7∘C (43 to 45∘F), with summer highs peaking at only about 14 to 15∘C (57 to 59∘F), typically in August. The tidal flows in the Firth of Clyde mean the water is dynamic but consistently chilly.
Swimming in the River Clyde at Dumbarton is strongly discouraged and carries significant risks, despite general public access rights to Scottish waters. The main concerns are powerful undercurrents, which are often unseen and deadly, the threat of cold water shock due to the frigid temperatures, and concerns over historic pollution and water quality, particularly following heavy rain. For safer and more enjoyable local activities, visitors can explore the impressive Dumbarton Castle perched atop its volcanic rock, or head north to the nearby Loch Lomond and The Trossachs National Park for hillwalking and organised watersports.