Helensburgh Temperature by Month

The average annual maximum temperature in Helensburgh, Strathclyde, United Kingdom is 13°C (55°F), with daytime highs ranging from 8°C (46°F) in January to 19°C (66°F) in July. This page covers monthly averages, day-night differences, and how Helensburgh compares to cities worldwide.

The weather in Helensburgh experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 11°C (52°F) in July to 2°C (36°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Helensburgh by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. July, the city's warmest month, gets 152 hours of sunshine.

The chart below shows the average temperature throughout the year:

Helensburgh's average annual maximum temperature is 13°C (55°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Helensburgh, January is the coolest month, with average highs of 8°C (46°F) and humidity around 87%, considered very high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Helensburgh this rarely lasts long on the ground.

For more on Helensburgh's weather, including monthly rainfall, sunshine hours, and humidity, visit our Helensburgh climate page.