May weather forecast
St. Augustine, FL

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Palm trees and colorful houses in front of water fountains in a popular town square in St. Augustine, Florida
Palm trees and colorful houses in front of water fountains in a popular town square in St. Augustine, Florida

Weather in May

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

St. Augustine observes a slight uplift in the average high-temperature with the onset of May, adjusting from April's moderately hot 78.1°F (25.6°C) to a still warm 84°F (28.9°C). An average low-temperature of 64.9°F (18.3°C) is observed during May nights in St. Augustine.

Rainfall

In St. Augustine, in May, during 8 rainfall days, 3.11" (79mm) of precipitation is typically accumulated. In St. Augustine, during the entire year, the rain falls for 116 days and collects up to 50" (1270mm) of precipitation.

Ocean temperature

In May, the average ocean temperature in St. Augustine is 75.7°F (24.3°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.7°F (24.3°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 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, 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

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

UV index

In St. Augustine, the average daily maximum UV index in May is 10. A UV Index estimate of 8 to 10 represents a very high threat to health from exposure to the Sun's UV rays for the average person.
Note: In May, a daily UV index of 10 turns into the following recommendations:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Ensure the liberal application and reapplication of a broad-spectrum SPF 30+ sunscreen after each outdoor activity or swim, and every two hours. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.

Frequently asked questions

How hot is it in May?

The average high-temperature and low-temperature during May are 84°F (28.9°C) and 64.9°F (18.3°C) respectively.

How many days does it rain in May?

In May, the rain falls for 8 days. Throughout May, 3.11" (79mm) of precipitation is accumulated.

How warm is the water in May?

In St. Augustine, in May, the average water temperature is 75.7°F (24.3°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 75.7°F (24.3°C) water.

How many hours of daylight does St. Augustine have in May?

The average day length in May is 13h and 40min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 6:41 am and sunset at 8:02 pm. On the last day of the month, in St. Augustine, sunrise is at 6:24 am and sunset at 8:21 pm EDT.

What are the months with the most sunshine?

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

How many hours of sunshine does St. Augustine have in May?

In May, the average sunshine duration is 9h.

How high is the UV index in May?

The average daily maximum UV index in May is 10. A UV Index reading of 8 to 10 represents a very high health threat from exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
St. Augustine, FL

Average temperature in May - St. Augustine, FL
  • Average high temperature in May: 84°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (66°F).

  • Average low temperature in May: 65°F

The month with the highest average low temperature is August (73°F).
The coldest month (with the lowest average low temperature) is January (46°F).

Average rainfall in May
St. Augustine, FL

Average rainfall in May - St. Augustine, FL
  • Average rainfall in May: 3.1"

The wettest month (with the highest rainfall) is September (7.5").
The driest month (with the least rainfall) is November (2.3").

Average rainfall days in May
St. Augustine, FL

Average rainfall days in May - St. Augustine, FL
  • Average rainfall days in May: 8 days

The months with the highest number of rainy days are July and August (15 days).
The month with the least rainy days is April (6 days).

Average sea temperature in May
St. Augustine, FL

Average sea temperature in May - St. Augustine, FL
  • Average sea temperature in May: 75.8°F

The best month for swimming (with the highest average sea temperature) is August (83.8°F).
The coldest months (with the lowest average sea temperature) are January and February (64.3°F).

Average daylight in May /
Average sunshine in May
St. Augustine, FL

Average daylight in May / Average sunshine in May - St. Augustine, FL
  • Average daylight in May: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in May: 9h

The months with the most sunshine are March, April, May, June, July and August (Average sunshine: 9h).
The month with the least sunshine is December (Average sunshine: 6h).

Average UV index in May
St. Augustine, FL

Average UV index in May - St. Augustine, FL
  • Average UV index in May: 10

The months with the highest UV index are June and July (UV index 11).
The months with the lowest UV index are January and December (UV index 4).

St. Augustine, Florida, USA

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