Monthly weather forecast and climate
Hilton Head Island, SC

Hilton Head Island has a humid subtropical type of climate (Köppen climate classification Cfa) with warm, humid summers and cold winters. Hilton Head Island, or simply Hilton Head, lies in the Beaufort County of South Carolina in the United States. The popular tourist destination is a resort town and a barrier island in the Atlantic Ocean that affects its climate, along with its location near the tropics.

Hilton Head lies at an average elevation of 3 meters above sea level. The topography consists of maritime forests, an interior with wetlands, marshlands, and shifting beaches. The Broad Creek separates the two parts of the island, of which only the southern half is an actual barrier island. The island has 12 miles of beaches on the Atlantic Ocean, and the ocean waters are one of the best in the United States.

Summer is hot and humid in Hilton Head as the temperatures lie in the 71.1°F (21.7°C) to 89.1°F (31.7°C) range with the peak in July. Every day temperature crosses 80.1°F (26.7°C) in the hot season, while one-third of the days touch 90°F (32.2°C). Winters are mild to cold with a few frosty nights, as the low temperatures drop below 32°F (0°C). Spring is the sunniest period with unpredictable rain amid pleasant weather. Autumn has comfortable weather with warm ocean temperatures and less rainfall in its latter half.

The annual average precipitation in Hilton Head is 51" (1295.4mm) with rainfall throughout the year. June to September receives the majority of the yearly rainfall, but there is rarely any dry period due to the constant clashes of warm and cold air masses over the region.
The annual sunshine is ample to the tune of 2730 hours as the summer days receive 14 hours of sunlight. The average humidity is 72%, and mornings are usually the most humid. Snowfall is absent in Hilton Head due to its southern location and maritime surroundings.

The record high temperature for Hilton Head Island is 107.1°F (41.7°C), while the record low temperature is 3.9°F (-15.6°C).
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Hilton Head is popular around the year tourist destination, but the best time to visit Hilton Head Island is late spring from April to May and early autumn from September to October. The temperatures are usually comfortable in the shoulder seasons, the seawaters are mild, the crowds are manageable, and the chances of stormy weather are minimal. Summer is the peak tourist season, and the temperatures can cross 90°F (32.2°C) with high humidity and heavy rainfall.

The worst time to visit Hilton Head Island, if there is any, is during the winter between December to February. The winter days have comfortable temperatures that reach up to 70°F (21.1°C), but several nights may drop to freezing. A cold wave sweeping from the northern plains may descend to the south and bring down the temperatures. The skies can be occasionally cloudy, and the conditions misty.

Hilton Head Island is prone to thunderstorms during the summer and flooding amid heavy rainfall. The entire Beaufort County faces a threat from hurricanes and tornadoes. The storm season is from June to October but may extend from spring to autumn in an odd year. Severe storms cause routine power outage along with the destruction of property.

January is usually the coldest month of the year in Hilton Head with the average temperatures in the cold 37.9°F (3.3°C) to 61°F (16.1°C) range. Weather in January »

February is a mild winter month in Hilton Head with the average temperatures in the 39.9°F (4.4°C) to 63°F (17.2°C) range. A few days touch 70°F (21.1°C). Weather in February »

March is warm and damp with the arrival of the spring season in Hilton Head amid unpredictable weather. The average temperatures are in the region of 46.9°F (8.3°C) to 69.1°F (20.6°C). Weather in March »

April is one of the best times to visit Hilton Head with the advent of the spring season. The island basks in beautiful sunshine as the last remnants of winter pass away. Weather in April »

The average temperatures are in the comfortable 62.1°F (16.7°C) to 82°F (27.8°C) range as almost every day records at least 70°F (21.1°C). Weather in May »

June is the beginning of the wet and humid summer season in Hilton Head, which sees average temperatures in the 69.1°F (20.6°C) to 87.1°F (30.6°C) range. Weather in June »

July is the hottest month of the year in Hilton Head, with the average high temperature around the 90°F (32.2°C) mark. The days mostly remain below the 95°F (35°C). Weather in July »

The rain Gods thrash the city with 8.2" (208.3mm) of rain. The average humidity is the highest of the year at 79%, and the muggy conditions bring uncomfortable weather. Weather in August »

The average temperatures are in the mild zone of 68°F (20°C) to 84.9°F (29.4°C) with daily sunshine for 7 hours. It is rare for day's temperature to go past 90°F (32.2°C). Weather in September »

October sees a drop in temperatures, and the conditions are pleasantly warm. The average temperatures are usually in the 57°F (13.9°C) to 78.1°F (25.6°C) range. Weather in October »

November is the driest month of the year in Hilton Head with the average temperatures between 48°F (8.9°C) to 70°F (21.1°C). Weather in November »

December starts the mild to cold winter in Hilton Head as the misty cold spreads slowly over the island. The average temperatures are in the range of 41°F (5°C) to 63°F (17.2°C). Weather in December »

What is the coldest month in Hilton Head Island?

With an average high-temperature of 61°F (16.1°C) and an average low-temperature of 37.9°F (3.3°C), January is the coldest month.

How many days does it rain in Hilton Head Island?

Throughout the year, in Hilton Head Island, South Carolina, there are 111 rainfall days, and 51.4" (1305.6mm) of precipitation is accumulated.

What month is the sea coldest in Hilton Head Island?

Month with the coldest seawater is February, with an average sea temperature of 57.6°F (14.2°C). Swimming in 57.6°F (14.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the warmest month in Hilton Head Island?

The warmest month is July, with an average high-temperature of 90°F (32.2°C) and an average low-temperature of 72°F (22.2°C).

What is the rainiest month in Hilton Head Island?

The month with the most rainfall in Hilton Head Island, South Carolina, is August when the rain falls for 13 days and typically aggregates up to 8.9" (226.1mm) of precipitation.

What month is the sea warmest in Hilton Head Island?

With an average sea temperature of 83.5°F (28.6°C), August is the month with the warmest seawater. For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the driest month in Hilton Head Island?

The month with the least rainfall is November when the rain falls for 6 days and typically collects 2.4" (61mm) of precipitation.
Average temperature - Hilton Head Island, SC
Average rainfall - Hilton Head Island, SC

The wettest month (with the highest rainfall) is August (226.1mm).
The driest month (with the lowest rainfall) is November (61mm).

Average rainfall days - Hilton Head Island, SC

Months with the highest number of rainy days are July and August (13 days).
Months with the lowest number of rainy days are October and November (6 days).

Average sea temperature - Hilton Head Island, SC

The best month for swimming (with the highest average sea temperature) is August (28.6°C).
The coldest month (with the lowest average sea temperature) is February (14.2°C).

Average daylight / Average sunshine - Hilton Head Island, SC

The month with the longest days is June (Average daylight: 14.2h).
The month with shortest days is December (Average daylight: 10.1h).

Months with most sunshine are April, May, June and July (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 6).

Average UV index - Hilton Head Island, SC