May weather forecast
Saint Simons Island, GA

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A long pier with a large shed on the St. Simons Island, Georgia, the rocks and seawater and colorful sunset clouds in the sky above
A long pier with a large shed on the St. Simons Island, Georgia, the rocks and seawater and colorful sunset clouds in the sky above

Weather in May

May heralds the arrival of summer on Saint Simons Island with noticeable increases in temperature, producing more hot and humid conditions. Compared to April, May offers less rainfall despite warmer temperatures. The daylight extends more, making way for longer excursions, and water lovers enjoy comfortably warm sea temperatures. May's climatic apex is the high average sea temperature of 73.9°F (23.3°C), up by 6.6°F (-14.1°C) from April. The month concludes the spring’s moderate conditions and transitions into the popular and vibrant summer season.

Temperature

May in Saint Simons Island introduces a minor temperature shift, with average high-temperatures adjusting from April's 75°F (23.9°C) to a still warm 81.1°F (27.3°C). Saint Simons Island experiences an average low-temperature of 69.1°F (20.6°C) in the month of May.

Heat index

May's average heat index is calculated to be a tropical 86°F (30°C). If one remains active during constant exposure, it might cause exhaustion and heat cramps.
Observations indicate that the heat index values are for shady locations with light wind. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent 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 shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.

Humidity

In May, the average relative humidity is 75%.

Rainfall

In Saint Simons Island, during May, the rain falls for 12.6 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Saint Simons Island, Georgia, during the entire year, the rain falls for 163.3 days and collects up to 20.43" (519mm) of precipitation.

Snowfall

In Saint Simons Island, Georgia, snow does not fall in January, March through November.

Ocean temperature

In Saint Simons Island, the average seawater temperature in May is 73.9°F (23.3°C).
Note: If you're wary of the cold, the surrounding conditions—sunshine, wind, and air temperature become crucial when swimming in 73.9°F (23.3°C) waters. Olympic standards, for reference, are set between 77°F (25°C) and 82.4°F (28°C).

Daylight

In Saint Simons Island, the average length of the day in May is 13h and 45min.
On the first day of May, sunrise is at 6:40 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 8:24 pm EDT.

Sunshine

The average sunshine in May is 10.6h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 7 in May, converts into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Note! Reflective surfaces like sand and water heighten the UV radiation levels.
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Frequently asked questions

What are May temperatures in Saint Simons Island?

An average high-temperature, in May, in Saint Simons Island, is 81.1°F (27.3°C) and the average low-temperature is 69.1°F (20.6°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in May is calculated to be 86°F (30°C).

What is the average humidity in May in Saint Simons Island?

In May, the average relative humidity in Saint Simons Island, Georgia, is 75%.

How much does it rain in Saint Simons Island in May?

In Saint Simons Island, in May, during 12.6 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

When it does not snow in Saint Simons Island?

January, March through November are months without snowfall in Saint Simons Island, Georgia.

How warm is the water in May in Saint Simons Island?

In Saint Simons Island, Georgia, in May, the average water temperature is 73.9°F (23.3°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 73.9°F (23.3°C).

How many hours of daylight does Saint Simons Island have in May?

The average day length in May in Saint Simons Island is 13h and 45min.

When are sunrise and sunset in May in Saint Simons Island?

On the first day of May, sunrise is at 6:40 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 8:24 pm EDT.

How many hours of sunshine does Saint Simons Island have in May?

The average sunshine duration in May is 10.6h.

When is the highest UV index in Saint Simons Island?

May through September, with an average maximum UV index of 7, are months with the highest UV index in Saint Simons Island.

What is the UV index intensity in May in Saint Simons Island?

In Saint Simons Island, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Saint Simons Island, GA

Average temperature in May - Saint Simons Island, GA
  • Average high temperature in May: 81.1°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (60.4°F).

  • Average low temperature in May: 69.1°F

The month with the highest average low temperature is August (77.4°F).
The coldest month (with the lowest average low temperature) is January (47.7°F).

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Average pressure in May
Saint Simons Island, GA

Average pressure in May - Saint Simons Island, GA
  • Average pressure in May: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).

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Average wind speed in May
Saint Simons Island, GA

Average wind speed in May - Saint Simons Island, GA
  • Average wind speed in May: 8.2mph

The windiest months (with the highest average wind speed) are January and April (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

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Average humidity in May
Saint Simons Island, GA

Average humidity in May - Saint Simons Island, GA
  • Average humidity in May: 75%

The months with the highest relative humidity are August and December (78%).
The month with the lowest relative humidity is March (72%).

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Average rainfall in May
Saint Simons Island, GA

Average rainfall in May - Saint Simons Island, GA
  • Average rainfall in May: 1.42"

The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is January (0.59").

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Average rainfall days in May
Saint Simons Island, GA

Average rainfall days in May - Saint Simons Island, GA
  • Average rainfall days in May: 12.6 days

The month with the highest number of rainy days is August (23.3 days).
The month with the least rainy days is January (8.2 days).

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Average snowfall days in May
Saint Simons Island, GA

Average snowfall days in May - Saint Simons Island, GA
  • Average snowfall days in May: 0 days

The months with the highest number of snowfall days are February and December (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in May
Saint Simons Island, GA

Average sea temperature in May - Saint Simons Island, GA
  • Average sea temperature in May: 73.9°F

The best month for swimming (with the highest average sea temperature) is August (83.4°F).
The coldest month (with the lowest average sea temperature) is February (58.5°F).

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Average daylight in May /
Average sunshine in May
Saint Simons Island, GA

Average daylight in May / Average sunshine in May - Saint Simons Island, GA
  • Average daylight in May: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in May: 10h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in May
Saint Simons Island, GA

Average sunshine days in May - Saint Simons Island, GA
  • Average sunshine days in May: 16 days

The month with the most sunshine days is March (20.1 days).
The month with the least sunshine days is August (4.2 days).

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Average UV index in May
Saint Simons Island, GA

Average UV index in May - Saint Simons Island, GA
  • Average UV index in May: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 3).

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Average cloud cover in May
Saint Simons Island, GA

Average cloud cover in May - Saint Simons Island, GA
  • Average cloud cover in May: 27

The months with the most cloud cover are February and December (Cloud cover 38).
The months with the least cloud cover are April, May, June and July (Cloud cover 27).

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Average visibility in May
Saint Simons Island, GA

Average visibility in May - Saint Simons Island, GA
  • 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).

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Saint Simons Island, Georgia, USA

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