St Just Temperature by Month

St Just, Cornwall, United Kingdom has an average annual maximum temperature of 14°C (57°F), with moderate seasonal shifts ranging from 11°C (52°F) in February to 19°C (66°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The weather in St Just changes moderately throughout the year, offering enough variation to appreciate each season. Nights are cooler, with lows ranging from 16°C (61°F) to 7°C (45°F).

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

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 204 hours of sunshine.

The chart below shows the average temperature throughout the year:

St Just's average annual maximum temperature is 14°C (57°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.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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