Helensburgh Weather & Climate: Best Time to Visit

Visitors to Helensburgh can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a pleasant 19°C (66°F) in July to a chilly 8°C (46°F) in the coolest month, December.

Nights vary from 11°C (52°F) in July to around 2°C (36°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Helensburgh is known for its substantial rain/snowfall, with annual precipitation reaching 1780 mm (70 in). Precipitation levels in Helensburgh remain relatively steady throughout the year. January has the most rain, with 184 mm (7.2 in) over 23 days. In the driest month April, this drops slightly to 113 mm (4.4 in), making the city's climate fairly predictable. For more details, please visit our Helensburgh Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Helensburgh serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 6.3 hours of sunshine daily, and embrace the darker days in January, offering only 1.2 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Helensburgh.

The city experiences its highest humidity in January, reaching 87%. In May, the humidity drops to its lowest level at 68%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year