The hottest month in Cape Cod Beach is July when the average maximum temperature is 26°, average temperature is 22° and average minimum temperature is 19°.
The coolest month in Cape Cod Beach is January when the average maximum temperature is 3°, average temperature is -0° and average minimum temperature is -4°.
The longest days in Cape Cod Beach are in June, with an average of 15.2 hours of daylight per day. December has the shortest days with an average of 9.1 hours of daylight per day.
The sunniest days in Cape Cod Beach are in May which has the most hours of sunshine per day with an average of 6.4 hours of sunshine per day, making it a quite sunny month with some cloud cover. December has the least sunshine with an average of 4.7 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in July when it reaches 9.4 and lowest in December when it reaches 1.4.
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 Cape Cod Beach are found in August when they peak at 24° and lowest in January when they dip to 4°.
The sea is best for swimming between June and December when the temperature is above 16° which is cold for swimming, a full wet suit is required to spend any length of time in the sea.
The wettest month in Cape Cod Beach is April with 13.5cm of rain and October has the most days of rain with 16.7 days with some rain, a wet time to visit the beach.
The driest month in Cape Cod Beach is August with 6.9cm of rain and March has the fewest days of rain with 13.2 days with some rain, a slightly wet time to visit the beach.
The most humid month in Cape Cod Beach is July with a dew point (an indicator of humidity) of 20° which is somewhat uncomfortable for most people in cities but fine on a beach.
The least humid month in Cape Cod Beach is February with a dew point of -1° which is a bit dry for some.
The most windy month in Cape Cod Beach is March when the average maximum windspeed is 24kmh and the average wind speed is 13kmh.
The least windy month in Cape Cod Beach is August when the average maximum windspeed is 18kmh and the average wind speed is 9kmh.