Port Isaac Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Port Isaac.
Climate overview of Port Isaac
Port Isaac, Cornwall, United Kingdom, experiences moderate temperature changes through the seasons. August is the warmest month with daytime highs of 20°C (68°F), while February is the coolest at 10°C (50°F).
With around 1110 mm (44 in) of annual rainfall, Port Isaac has a notably wet climate. The wettest month is December. The sunniest month is May, with 7.4 hours of sunshine per day on average.
Port Isaac Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Port Isaac - and find the best time to visit.
Monthly Temperature in Port Isaac
The climate in Port Isaac experiences moderate temperature changes, with mild shifts between seasons. Average daytime temperatures reach a pleasant 20°C (68°F) in August. In February, the coolest month of the year, temperatures drop to a chilly 10°C (50°F).
At night, temperatures range from around 14°C (57°F) in August to 5°C (41°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Port Isaac
Port Isaac has a relatively rainy climate with high precipitation levels, averaging 1110 mm (44 in) of rainfall annually. Despite minor fluctuations, Port Isaac enjoys fairly consistent precipitation throughout the year. In December, you can expect around 119 mm (4.7 in) of precipitation, while in May, Port Isaac receives about 75 mm (3 in). For more details, please visit our Port Isaac Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Port Isaac
Port Isaac 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 2.2 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Port Isaac
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and August
- Warmest weather: July, August and September
- Most sunshine: May and June
Frequently asked questions about the climate in Port Isaac
What is the best time to visit Port Isaac?
July and August typically offer the most optimal weather in Port Isaac. In contrast, January, February, November and December tend to have less optimal conditions.
What temperatures can I expect in Port Isaac?
Daytime highs range from 10°C (50°F) in February to 20°C (68°F) in August. Nighttime lows range from 5°C (41°F) to 14°C (57°F).
How much rain does Port Isaac get?
Annual rainfall is around 1110 mm (44 in). December is the wettest month with 119 mm (4.7 in), while May is the driest with 75 mm (3 in).
How sunny is Port Isaac?
Port Isaac receives around 1,753 hours of sunshine per year. May is the sunniest month with 222 hours, while December is the cloudiest with just 65 hours.
Port Isaac 3-Day Forecast
Port Isaac on the map
Port Isaac is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
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