As the Hot season officially commences,
June in
Hangzhou sees temperatures swing between 21.4°C (70.5°F) and 29.1°C (84.4°F), coupled with a relative humidity of 80%. A significant amount of rainfall, 219mm (8.62"), marks this month as the peak of the rainy season. Despite this, the city's beauty is at its zenith with verdant foliage in full bloom. The temperature begins to soar, and the city is often bathed in aptly warm sunlight despite frequent showers.
Temperature
Transitioning into June, Hangzhou experiences an average high-temperature of a still warm 29.1°C (84.4°F), marking a minor shift from the preceding month. The low-temperature averages to an agreeable 21.4°C (70.5°F) during the nights of June.
Heat index
The heat index in June is appraised at a sweltering 35°C (95°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.
Humidity
With an average relative humidity of 80%, June is the most humid month.
Rainfall
June is the month with the most rainfall in Hangzhou. Rain falls for 14.6 days and accumulates 219mm (8.62") of precipitation.
Sea temperature
In June, the average sea temperature is 23.4°C (74.1°F).
Note: Consideration of an individual's cold resistance, combined with conditions like sunshine, wind, and temperature, suggests that swimming in 23.4°C (74.1°F) water can be delightful. (Olympic swimming is usually in 25°C (77°F) to 28°C (82.4°F) water.)
Daylight
June has the longest days of the year in Hangzhou, with an average of 14h and 6min of daylight.
On the first day of the month, sunrise is at 04:58 and sunset at 18:56. On the last day of June, sunrise is at 05:00 and sunset at 19:05 CST.
Sunshine
The average sunshine in June is 4.6h.
UV index
June through
August, with an average maximum UV index of 11, are months with the highest UV index. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 11 in June interprets into the following advice:
Undertake all key precautions, as unprotected skin and eyes may get burns in no time. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Even on a cloudy day, a sunscreen with at least a 30 SPF should be applied generously and frequently reapplied, including after a swim or outdoor exercise. Take note! Sand and water reflections strengthen the Sun's UV exposure.