May weather forecast
St. Augustine, FL

May gains prominence in St. Augustine as a prelude to the city's famous summer weather. The city starts transitioning from temperate to a tropical climate, with an observable increase in temperature and humidity. Interestingly, the average rainfall measures approximately 3.1" (79mm) throughout this month. The combination of extended daylight hours with plentiful sunshine ensures vibrant colors dominating the landscape. May's scintillating weather validates the adage "April showers bring May flowers," marking the advent of the summer season.

Temperature

A slight uplift of average high-temperatures is noted in May in St. Augustine, with temperatures adjusting from a warm 78.1°F (25.6°C) in April to a still moderately hot 84°F (28.9°C). During the nights in May, St. Augustine observes an average low-temperature of 64.9°F (18.3°C).

Rainfall

In May, in St. Augustine, the rain falls for 8 days. Throughout May, 3.11" (79mm) of precipitation is accumulated. Throughout the year, in St. Augustine, there are 116 rainfall days, and 50" (1270mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in St. Augustine is 75.7°F (24.3°C).
Note: Individual cold sensitivities, influenced by sunshine, wind, and the ambient temperature, play a role in finding a swim in 75.7°F (24.3°C) water pleasant. (Olympic swimming events mandate water temperatures from 77°F (25°C) to 82.4°F (28°C).)

Daylight

In May, the average length of the day in St. Augustine is 13h and 40min.
On the first day of May in St. Augustine, Florida, sunrise is at 6:41 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 6:24 am and sunset at 8:21 pm EDT.

Sunshine

March through August, with an average of 9h of sunshine, are months with the most sunshine in St. Augustine.

UV index

In St. Augustine, the average daily maximum UV index in May is 10. A UV Index reading of 8 to 10 represents a very high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: An average UV index of 10 in May transforms into this advice:
Be proactive in protecting yourself; skin and eyes can be harmed if left unprotected. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Apply generously and frequently reapply a sunscreen with SPF 30 or more even on cloudy days, particularly after a swim or outdoor exercise. Watch out! Sand and water enhance the UV exposure you receive.