May weather forecast
Williamsburg, FL

The last month of the spring, May, is a hot month in Williamsburg, Florida, with an average temperature varying between 86.5°F (30.3°C) and 68.9°F (20.5°C).

Temperature

Williamsburg's shift from April to May is accompanied by an average high-temperature of a hot 86.5°F (30.3°C), a slight deviation from 82.6°F (28.1°C). Throughout May, Williamsburg witnesses a consistent average low-temperature of 68.9°F (20.5°C).

Heat index

In May, the average heat index is estimated at a sweltering 96.8°F (36°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Williamsburg, the average relative humidity in May is 72%.

Rainfall

In Williamsburg, in May, it is raining for 11.1 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 126.6 rainfall days, and 9.06" (230mm) of precipitation is accumulated.

Daylight

In Williamsburg, the average length of the day in May is 13h and 34min.
On the first day of May, sunrise is at 6:44 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 6:28 am and sunset at 8:18 pm EDT.

Sunshine

In May, the average sunshine is 10.5h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.
Note: In May, a daily maximum UV index of 7 leads to the following instructions:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.