Dumbarton
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Dumbarton, United Kingdom

In January, the average sea temperature in Dumbarton, United Kingdom, is 8.3°C (46.9°F). Note: Swimming in 8.3°C (46.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in January »

In February, the average sea temperature in Dumbarton, United Kingdom, is 7.6°C (45.7°F). Note: Swimming in 7.6°C (45.7°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in February »

With an average sea temperature of 7.4°C (45.3°F), March is the month with the coldest seawater in Dumbarton, United Kingdom. Note: Swimming in 7.4°C (45.3°F) is considered life-threatening. Weather in March »

In Dumbarton, United Kingdom, in April, the average water temperature is 8.5°C (47.3°F). Note: Swimming in 8.5°C (47.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in April »

In Dumbarton, United Kingdom, in May, the average water temperature is 9.8°C (49.6°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in May »

In June, the average sea temperature in Dumbarton, United Kingdom, is 11.8°C (53.2°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in June »

In July, the average sea temperature in Dumbarton, United Kingdom, is 13.6°C (56.5°F). Note: Swimming in 13.6°C (56.5°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in July »

With an average sea temperature of 14.3°C (57.7°F), August is the month with the warmest seawater in Dumbarton, United Kingdom. Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in August »

In Dumbarton, United Kingdom, in September, the average water temperature is 14°C (57.2°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in September »

In Dumbarton, United Kingdom, in October, the average water temperature is 13.2°C (55.8°F). Note: Swimming in 13.2°C (55.8°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in October »

In November, the average sea temperature in Dumbarton, United Kingdom, is 11.9°C (53.4°F). Note: Swimming in 11.9°C (53.4°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in November »

In December, the average sea temperature in Dumbarton, United Kingdom, is 10°C (50°F). Note: Swimming in 10°C (50°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique. Weather in December »

What is the month with the coldest sea water in Dumbarton?

March is the month with the coldest seawater, with an average sea temperature of 7.4°C (45.3°F).

When are the longest days in Dumbarton?

June has the longest days of the year, with an average of 17.5h of daylight.

What is the month with the warmest sea water in Dumbarton?

The month with the warmest seawater in Dumbarton is August, with an average sea temperature of 14.3°C (57.7°F).

What is the month with the shortest days in Dumbarton?

December has the shortest days of the year in Dumbarton, United Kingdom, with an average of 7.1h of daylight.
Average sea temperature - Dumbarton, United Kingdom

The best month for swimming (with the highest average sea temperature) is August (14.3°C).
The coldest month (with the lowest average sea temperature) is March (7.4°C).

Average daylight - Dumbarton, United Kingdom

The month with the longest days is June (Average daylight: 17.5h).
The month with shortest days is December (Average daylight: 7.1h).