June weather forecast
Port Saint John, FL

The first month of the summer, June, is a tropical month in Port Saint John, Florida, with an average temperature fluctuating between 87.1°F (30.6°C) and 75.7°F (24.3°C).

Temperature

In Port Saint John, the average high-temperature in June is practically the same as in May - a tropical 87.1°F (30.6°C). In June, the average low-temperature is 75.7°F (24.3°C).

Heat index

In June, the average heat index is appraised at a torrid 102.2°F (39°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. 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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like wind, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in June is 78%.

Rainfall

In Port Saint John, during June, the rain falls for 22.8 days and regularly aggregates up to 5.28" (134mm) of precipitation. Throughout the year, there are 202 rainfall days, and 40.2" (1021mm) of precipitation is accumulated.

Daylight

June has the longest days of the year, with an average of 13h and 56min of daylight.
On the first day of the month, sunrise is at 6:25 am and sunset at 8:16 pm. On the last day of June, sunrise is at 6:28 am and sunset at 8:24 pm EDT.

Sunshine

The average sunshine in June in Port Saint John is 10.6h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: In June, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.