St Mellion Weather & Climate: Best Time to Visit

The climate in St Mellion experiences moderate temperature changes, with mild shifts between seasons. Average daytime temperatures reach a pleasant 20°C (68°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 10°C (50°F).

At night, temperatures range from around 13°C (55°F) in July to 4°C (39°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

St Mellion has a notably wet climate with abundant precipitation, recording 1028 mm (40 in) of rainfall per year. Despite minor fluctuations, St Mellion enjoys fairly consistent precipitation throughout the year. In December, you can expect around 102 mm (4 in) of precipitation, while in September, St Mellion receives about 70 mm (2.8 in). For more details, please visit our St Mellion Precipitation page.

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

The average number of days each month with precipitation

St Mellion can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 7.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.8 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The city experiences its highest humidity in January, reaching 86%. In May, the humidity drops to its lowest level at 79%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year