May weather forecast
Sanibel, FL

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A large flock of the iconic royal tern birds on the white sandy shores on a typical beach in Sanibel, Florida
A large flock of the iconic royal tern birds on the white sandy shores on a typical beach in Sanibel, Florida

Weather in May

May in Sanibel showcases a noticeable rise in temperature, reflecting the city's move deeper into its warm season. May features noticeable heat accompanied by an increase in rainfall, emphasizing the month's role as a transition period. The highest daily average temperature is approximately 82.9°F (28.3°C), signifying the city's entry into its hot season. Coupled with the heat, May experiences a significant surge in rainfall, heralding the city's wet season. Irrespective of these shifts, Sanibel's May weather sees the city retain its charm with clear skies, promising sea temperatures, and abundant daylight hours.

Temperature

May in Sanibel, Florida, welcomes an average high-temperature of a still moderately hot 82.9°F (28.3°C), not much different from the preceding month. Sanibel, during May nights, observes a steady temperature, averaging at a still moderately hot 74.3°F (23.5°C).

Heat index

In May, the heat index is estimated at a tropical 89.6°F (32°C). With extended exposure and activity, one might feel exhausted and experience heat cramps.
In reference to the heat index, it's for places in shade and with a slight wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.

Humidity

March, May, July, August and October, with an average relative humidity of 73%, are the least humid months in Sanibel.

Rainfall

In Sanibel, during May, the rain falls for 16.6 days and regularly aggregates up to 3.43" (87mm) of precipitation. In Sanibel, Florida, during the entire year, the rain falls for 190.9 days and collects up to 41.73" (1060mm) of precipitation.

Ocean temperature

In Sanibel, in May, the average water temperature is 79.3°F (26.3°C).
Note: Between 77°F (25°C) and 84.2°F (29°C), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

In Sanibel, the average length of the day in May is 13h and 27min.
On the first day of May in Sanibel, Florida, sunrise is at 6:49 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:16 pm EDT.

Sunshine

With an average of 11h of sunshine, May has the most sunshine of the year.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum UV index of 7 in May translates into the following recommendations:
Ward off overexposure. Defence against solar harm is crucial. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Heads up! UV intensity is amplified by reflections from water and sand.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot in Sanibel during May?

In May, in Sanibel, the average high-temperature is 82.9°F (28.3°C), and the average low-temperature is 74.3°F (23.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, in May is estimated at 89.6°F (32°C).

What are the least humid months in Sanibel?

The months with the lowest humidity are March, May, July, August and October, with an average relative humidity of 73%.

What is the average humidity in May in Sanibel?

In Sanibel, the average relative humidity in May is 73%.

How much does it rain in Sanibel in May?

In Sanibel, Florida, during May, the rain falls for 16.6 days and regularly aggregates up to 3.43" (87mm) of precipitation.

How warm is the water in May in Sanibel?

In Sanibel, the average seawater temperature in May is 79.3°F (26.3°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in May in Sanibel?

In May, the average day length in Sanibel, Florida, is 13h and 27min.

What time are sunrise and sunset in May in Sanibel?

On the first day of May, sunrise is at 6:49 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:16 pm EDT.

What month has the most sunshine in Sanibel?

With an average of 11h of sunshine, May has the most sunshine of the year in Sanibel, Florida.

How many hours of sunshine does Sanibel have in May?

The average sunshine duration in May in Sanibel, Florida, is 11h.

When is the highest UV index in Sanibel?

The months with the highest UV index in Sanibel, Florida, are May through September, with an average maximum UV index of 7.

What is the UV index reading in May in Sanibel?

In Sanibel, Florida, the average daily maximum UV index in May is 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Sanibel, FL

Average temperature in May - Sanibel, FL
  • Average high temperature in May: 82.9°F

The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (69.8°F).

  • Average low temperature in May: 74.3°F

The month with the highest average low temperature is August (81.1°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

Average pressure in May
Sanibel, FL

Average pressure in May - Sanibel, FL
  • Average pressure in May: 30"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

Average wind speed in May
Sanibel, FL

Average wind speed in May - Sanibel, FL
  • Average wind speed in May: 8.5mph

The windiest months (with the highest average wind speed) are October and November (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

Average humidity in May
Sanibel, FL

Average humidity in May - Sanibel, FL
  • Average humidity in May: 73%

The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are March, May, July, August and October (73%).

Average rainfall in May
Sanibel, FL

Average rainfall in May - Sanibel, FL
  • Average rainfall in May: 3.43"

The wettest month (with the highest rainfall) is August (8.54").
The driest month (with the least rainfall) is February (1.06").

Average rainfall days in May
Sanibel, FL

Average rainfall days in May - Sanibel, FL
  • Average rainfall days in May: 16.6 days

The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (8.2 days).

Average sea temperature in May
Sanibel, FL

Average sea temperature in May - Sanibel, FL
  • Average sea temperature in May: 79.4°F

The best month for swimming (with the highest average sea temperature) is August (87.1°F).
The coldest month (with the lowest average sea temperature) is January (65.3°F).

Average daylight in May /
Average sunshine in May
Sanibel, FL

Average daylight in May / Average sunshine in May - Sanibel, FL
  • Average daylight in May: 13h and 3min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in May: 11h and 0min

The month with the most sunshine is May (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

Average sunshine days in May
Sanibel, FL

Average sunshine days in May - Sanibel, FL
  • Average sunshine days in May: 11.9 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is August (2.3 days).

Average UV index in May
Sanibel, FL

Average UV index in May - Sanibel, FL
  • Average UV index in May: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and February (UV index 5).

Average cloud cover in May
Sanibel, FL

Average cloud cover in May - Sanibel, FL
  • Average cloud cover in May: 23

The month with the most cloud cover is January (Cloud cover 29).
The months with the least cloud cover are March and May (Cloud cover 23).

Average visibility in May
Sanibel, FL

Average visibility in May - Sanibel, FL
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Sanibel, Florida, USA

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