The hottest month in Tregastel is July when the average maximum temperature is 20°, average temperature is 16° and average minimum temperature is 13°.
The coolest month in Tregastel is February when the average maximum temperature is 9°, average temperature is 6° and average minimum temperature is 4°.
The longest days in Tregastel are in June, with an average of 16.2 hours of daylight per day. December has the shortest days with an average of 8.3 hours of daylight per day.
The sunniest days in Tregastel are in June which has the most hours of sunshine per day with an average of 7.6 hours of sunshine per day, making it a quite sunny month with some cloud cover. December has the least sunshine with an average of 1.8 hours of sunshine per day, making it not a particularly sunny month.
The ultraviolet index is the highest in June when it reaches 8 and lowest in December when it reaches 0.7.
An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Tregastel are found in August when they peak at 24° and lowest in February when they dip to 13°.
The sea is best for swimming between June and December when the temperature is above 17° which is cool for swimming, shorty wetsuit may help you extend your time in the water.
The most humid month in Tregastel is August with a dew point (an indicator of humidity) of 16° which is comfortable for everyone.
The least humid month in Tregastel is February with a dew point of 6° which is a bit dry for some.
The most windy month in Tregastel is December when the average maximum windspeed is 29kmh and the average wind speed is 17kmh.
The least windy month in Tregastel is September when the average maximum windspeed is 23kmh and the average wind speed is 12kmh.