May weather forecast
Saint Petersburg, FL

May marks the advent of summer in Saint Petersburg, Florida, underlined by intensified heat and an elongation in daylight duration. Drawing a comparison with April, May's climate is demonstrably warmer, while a rise in relative humidity makes its presence felt. Dovetailing with the increased warmth, the sea temperature escalates further, signaling the best times for marine activities. A distinct feature of May is an impressive 2.09in of rainfall, the highest thus far in the year. In addition, an intensification in UV index to seven adds an essential summer characteristic to this month.

Temperature

Saint Petersburg marks the onset of May with an average high-temperature of a still warm 84°F (28.9°C), subtly divergent from April's 79.9°F (26.6°C). Saint Petersburg, during the nights of May, experiences an average temperature drop to a pleasant 72.7°F (22.6°C).

Heat index

Throughout May, the heat index is appraised at a hot 91.4°F (33°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.

Humidity

With an average relative humidity of 71%, May is the least humid month.

Rainfall

In Saint Petersburg, in May, it is raining for 14.5 days, with typically 2.09" (53mm) of accumulated precipitation. In Saint Petersburg, during the entire year, the rain falls for 172.1 days and collects up to 27.2" (691mm) of precipitation.

Ocean temperature

In May, the average ocean temperature is 78.1°F (25.6°C).
Note: For any water activity, temperatures between 77°F (25°C) and 84.2°F (29°C) are deemed excellent and extremely satisfying for enduring periods.

Daylight

In Saint Petersburg, the average length of the day in May is 13h and 32min.
On the first day of May, sunrise is at 6:50 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 8:21 pm EDT.

Sunshine

May has the most sunshine of the year, with an average of 11.2h of sunshine.

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 rays for the ordinary person.
Note: The daily high UV index of 7 in May translates into this advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat. Take heed! Reflections of sand and water make the Sun's UV rays stronger.