Portmellon Temperature by Month
Portmellon, Cornwall, United Kingdom has an average annual maximum temperature of 15°C (59°F), with moderate seasonal shifts ranging from 10°C (50°F) in February to 20°C (68°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Portmellon Monthly Temperatures
In Portmellon, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 14°C (57°F) in August to 5°C (41°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Portmellon by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. August, the city's warmest month, gets 202 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Portmellon vs the United Kingdom
The map below shows the annual temperature across the United Kingdom. You can also select individual months if you want to compare a specific time of year.
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Portmellon vs World: Temperature Compared
Portmellon's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
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 Portmellon this rarely lasts long on the ground.
For more on Portmellon's weather — including monthly rainfall, sunshine hours, and humidity — visit our Portmellon climate page.
