Altarnun Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Altarnun.
Climate overview of Altarnun
Altarnun, Cornwall, United Kingdom, experiences moderate temperature changes through the seasons. July is the warmest month with daytime highs of 20°C (68°F), while February is the coolest at 10°C (50°F).
The city receives considerable rainfall, with around 1063 mm (42 in) annually. December is the wettest month. The most sunshine falls in May, with an average of 7.4 hours of daily sunshine.
Altarnun Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Altarnun — and find the best time to visit.
Monthly Temperature in Altarnun
In Altarnun, seasonal changes bring about a moderate variation in temperatures. Typically, average maximum daytime temperatures range from a pleasant 20°C (68°F) in July to a chilly 10°C (50°F) in the coolest month, February.
Nights vary from 13°C (55°F) in July to around 4°C (39°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Altarnun
Altarnun has a relatively rainy climate with high precipitation levels, averaging 1063 mm (42 in) of rainfall annually. Precipitation levels in Altarnun remain relatively steady throughout the year. December has the most rain, with 108 mm (4.3 in) over 21 days. In the driest month September, this drops slightly to 74 mm (2.9 in), making the city's climate fairly predictable. For more details, please visit our Altarnun Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
Sunshine Hours in Altarnun
For those who appreciate different seasons, Altarnun serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 7.4 hours of sunshine daily, and embrace the darker days in December, offering only 1.8 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Altarnun by Month
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
Best Time to Visit Altarnun
Rainfall during this time ranges from 74 mm (2.9 in) in September to 86 mm (3.4 in) in August. This means you can expect a mix of sunny days and occasional showers. Wondering where to travel based on your weather preferences? Our recommendation tool helps you find destinations with your ideal climate conditions. Use our weather planner to find your perfect destination.
Frequently asked questions about the climate in Altarnun
What is the best time to visit Altarnun?
July and August typically offer the most optimal weather in Altarnun. In contrast, January, February, November and December tend to have less optimal conditions.
What temperatures can I expect in Altarnun?
Daytime highs range from 10°C (50°F) in February to 20°C (68°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F).
How much rain does Altarnun get?
Annual rainfall is around 1063 mm (42 in). December is the wettest month with 108 mm (4.3 in), while September is the driest with 74 mm (2.9 in).
How sunny is Altarnun?
Altarnun receives around 1,729 hours of sunshine per year. May is the sunniest month with 222 hours, while December is the cloudiest with just 55 hours.
Altarnun 3-Day Forecast
Altarnun 3-Day Forecast
Altarnun on the map
Altarnun is highlighted — select any city to see its climate.
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