May weather forecast
Marco Island, FL

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Sunset over the beach in Marco Island Beach, Florida, along the Gulf of Mexico
Sunset over the beach in Marco Island Beach, Florida, along the Gulf of Mexico

Weather in May

When May sweeps in, Marco Island welcomes its summertime with an uplift in temperatures. May's unique climatological pattern is marked by a significant jump in rainfall, spiking to 4.1" (104mm) across eight rainy days. The increased rainfall, coupled with the warming weather, drums up the typical tropical climate of Marco Island. The lengthening days invite more sunshine hours, offering longer daylight stretches for outdoor enthusiasts.

Temperature

May ushers in an average high-temperature of a tropical 86°F (30°C), aligning closely with the preceding month. Marco Island's May nights cool down to an average low-temperature of 68°F (20°C).

Rainfall

In May, in Marco Island, Florida, the rain falls for 8 days. Throughout May, 4.06" (103mm) of precipitation is accumulated. Throughout the year, in Marco Island, there are 111 rainfall days, and 51.57" (1310mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in Marco Island is 80.1°F (26.7°C).
Note: Water activities including swimming and diving are pleasurable in temperatures between 77°F (25°C) and 84.2°F (29°C), ensuring comfort and enjoyment for extended time frames.

Daylight

In Marco Island, the average length of the day in May is 13h and 25min.
On the first day of May, sunrise is at 6:49 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:14 pm EDT.

Sunshine

The months with the most sunshine in Marco Island, Florida, are April through July, with an average of 10h of sunshine.

UV index

The months with the highest UV index in Marco Island are April through August, with an average maximum UV index of 11. A UV Index of 11, and more, symbolizes an extreme threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 11 in May converts into the following recommendations:
Take all critical precautions, unprotected skin might burn swiftly. 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. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Use liberally and reapply a broad-spectrum sunscreen with at least SPF 30 every two hours and right after outdoor activities or a swim. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.
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Frequently asked questions

How hot is May in Marco Island?

During May, Marco Island experiences an average high-temperature of 86°F (30°C) and a low-temperature of 68°F (20°C).

How much does it rain in Marco Island in May?

In Marco Island, Florida, during May, the rain falls for 8 days and regularly aggregates up to 4.06" (103mm) of precipitation.

What is the water temperature in May in Marco Island?

In Marco Island, the average seawater temperature in May is 80.1°F (26.7°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in May in Marco Island?

The average day length in May in Marco Island is 13h and 25min.

When are sunrise and sunset in May in Marco Island?

In May, on the first day of the month, sunrise is at 6:49 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:14 pm EDT.

What are the months with the most sunshine in Marco Island?

April through July, with an average of 10h of sunshine, are months with the most sunshine in Marco Island.

How many hours of sunshine does Marco Island have in May?

The average sunshine duration in May is 10h.

What are the months with the highest UV index in Marco Island?

April through August, with an average maximum UV index of 11, are months with the highest UV index in Marco Island, Florida.

What is the UV index reading in May in Marco Island?

In Marco Island, the average daily maximum UV index in May is 11. A UV Index reading of 11, and higher, represents an extreme health threat from exposure to the Sun's UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Marco Island, FL

Average temperature in May - Marco Island, FL
  • Average high temperature in May: 86°F

The warmest months (with the highest average high temperature) are July, August and September (90°F).
The months with the lowest average high temperature are January, February and December (75°F).

  • Average low temperature in May: 68°F

The month with the highest average low temperature is August (75°F).
The coldest months (with the lowest average low temperature) are January and February (55°F).

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Average rainfall in May
Marco Island, FL

Average rainfall in May - Marco Island, FL
  • Average rainfall in May: 4.1"

The wettest month (with the highest rainfall) is June (9.2").
The driest months (with the least rainfall) are November and December (1.5").

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Average rainfall days in May
Marco Island, FL

Average rainfall days in May - Marco Island, FL
  • Average rainfall days in May: 8 days

The month with the highest number of rainy days is August (16 days).
The month with the least rainy days is April (4 days).

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Average sea temperature in May
Marco Island, FL

Average sea temperature in May - Marco Island, FL
  • Average sea temperature in May: 80.1°F

The best month for swimming (with the highest average sea temperature) is August (87.3°F).
The coldest months (with the lowest average sea temperature) are January and February (67.2°F).

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Average daylight in May /
Average sunshine in May
Marco Island, FL

Average daylight in May / Average sunshine in May - Marco Island, FL
  • Average daylight in May: 13h and 2min

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in May: 10h

The months with the most sunshine are April, May, June and July (Average sunshine: 10h).
The months with the least sunshine are January, November and December (Average sunshine: 7h).

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Average UV index in May
Marco Island, FL

Average UV index in May - Marco Island, FL
  • Average UV index in May: 11

The months with the highest UV index are April, May, June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 5).

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Marco Island, Florida, USA

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