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Average Weather in October in Hilton Head Island South Carolina, United States

In Hilton Head Island, the month of October is characterized by falling daily high temperatures, with daily highs decreasing by 8°F, from 80°F to 72°F over the course of the month, and rarely exceeding 87°F or dropping below 63°F.

Daily low temperatures decrease by 10°F, from 67°F to 57°F, rarely falling below 46°F or exceeding 74°F.

For reference, on July 22, the hottest day of the year, temperatures in Hilton Head Island typically range from 76°F to 89°F, while on January 17, the coldest day of the year, they range from 42°F to 59°F.

Average High and Low Temperature in October

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in October

Average Hourly Temperature in October in Hilton Head Island12 AM4 AM8 AM12 PM4 PM8 PM12 AM181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131SepNovcoldcoolcomfortablewarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

The month of October in Hilton Head Island experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 37% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 35% on October 27.

The clearest day of the month is October 27, with clear, mostly clear, or partly cloudy conditions 65% of the time.

For reference, on July 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on October 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.

Cloud Cover in October

Cloud Cover in October in Hilton Head Island0%10%20%30%40%50%60%70%80%90%100%181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131SepNovOct 2735%Oct 2735%Oct 140%Oct 140%Oct 1137%Oct 1137%overcastmostly cloudypartly cloudymostly clearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hilton Head Island, the chance of a wet day over the course of October is very rapidly decreasing, starting the month at 28% and ending it at 17%.

For reference, the year's highest daily chance of a wet day is 53% on August 7, and its lowest chance is 17% on October 30.

Probability of Precipitation in October

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during October in Hilton Head Island is rapidly decreasing, starting the month at 3.7 inches, when it rarely exceeds 7.5 inches or falls below 0.9 inches, and ending the month at 2.4 inches, when it rarely exceeds 5.5 inches or falls below 0.3 inches.

Average Monthly Rainfall in October

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

Over the course of October in Hilton Head Island, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 56 minutes, implying an average daily decrease of 1 minute, 52 seconds, and weekly decrease of 13 minutes, 5 seconds.

The shortest day of the month is October 31, with 10 hours, 54 minutes of daylight and the longest day is October 1, with 11 hours, 50 minutes of daylight.

Hours of Daylight and Twilight in October

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Hilton Head Island is 7:17 AM on October 1 and the latest sunrise is 22 minutes later at 7:39 AM on October 31.

The latest sunset is 7:07 PM on October 1 and the earliest sunset is 34 minutes earlier at 6:33 PM on October 31.

Daylight saving time is observed in Hilton Head Island during 2017, but it neither starts nor ends during October, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 6:16 AM and sets 14 hours, 16 minutes later, at 8:32 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 10 hours, 2 minutes later, at 5:22 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in October

The solar day over the course of October. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Hilton Head Island is very rapidly decreasing during October, falling from 61% to 25% over the course of the month.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 30, the leasy muggy day of the year, there are muggy conditions 2% of the time.

Humidity Comfort Levels in October

Humidity Comfort Levels in October in Hilton Head Island0%10%20%30%40%50%60%70%80%90%100%181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131SepNovOct 161%Oct 161%Oct 3125%Oct 3125%Oct 1147%Oct 1147%Oct 2136%Oct 2136%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Hilton Head Island is essentially constant during October, remaining within 0.1 miles per hour of 5.8 miles per hour throughout.

For reference, on January 22, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on August 17, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.

Average Wind Speed in October

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Hilton Head Island during October is predominantly out of the east from October 1 to October 20 and the north from October 20 to October 31.

Wind Direction in October

Wind Direction in October in Hilton Head IslandEN0%20%40%60%80%100%181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131SepNovwestsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Hilton Head Island is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Hilton Head Island is decreasing during October, falling by 6°F, from 79°F to 72°F, over the course of the month.

Average Water Temperature in October

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Hilton Head Island is gradually decreasing during October, falling by 0.8 kWh, from 4.8 kWh to 4.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in October

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Hilton Head Island are 32.194 deg latitude, -80.738 deg longitude, and 7 ft elevation.

The topography within 2 miles of Hilton Head Island is essentially flat, with a maximum elevation change of 16 feet and an average elevation above sea level of 7 feet. Within 10 miles is also essentially flat (33 feet). Within 50 miles is essentially flat (302 feet).

The area within 2 miles of Hilton Head Island is covered by herbaceous vegetation (67%), artificial surfaces (13%), and water (12%), within 10 miles by water (64%) and herbaceous vegetation (25%), and within 50 miles by water (50%) and trees (24%).

Data Sources

This report illustrates the typical weather in Hilton Head Island year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Hilton Head Island.

For each station, the records are corrected for the elevation difference between that station and Hilton Head Island according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Hilton Head Island is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Hilton Head Island and a given station.

The stations contributing to this reconstruction are: Hilton Head Airport (97%, 4.4 kilometers, northeast) and Hunter U. S. Army Airfield (3.3%, 42 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.