Fall Weather in Folly Beach United States

Daily high temperatures decrease by 20°F, from 86°F to 66°F, rarely falling below 55°F or exceeding 91°F.

Daily low temperatures decrease by 24°F, from 73°F to 49°F, rarely falling below 36°F or exceeding 78°F.

For reference, on July 22, the hottest day of the year, temperatures in Folly Beach typically range from 76°F to 89°F, while on January 17, the coldest day of the year, they range from 43°F to 60°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Uzunbağ, Turkey (6,144 miles away) and Kuai’an, China (8,195 miles) are the far-away foreign places with temperatures most similar to Folly Beach (view comparison).

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The fall in Folly Beach experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 47% to 43%. The lowest chance of overcast or mostly cloudy conditions is 35% on October 26.

The clearest day of the fall is October 26, with clear, mostly clear, or partly cloudy conditions 65% of the time.

For reference, on July 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on October 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Folly Beach, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 42% and ending it at 23%.

For reference, the year's highest daily chance of a wet day is 51% on August 4, and its lowest chance is 19% on November 3.

Rainfall

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

The average sliding 31-day rainfall during the fall in Folly Beach is very rapidly decreasing, starting the season at 5.1 inches, when it rarely exceeds 9.2 inches or falls below 1.8 inches, and ending the season at 2.4 inches, when it rarely exceeds 4.4 inches or falls below 0.8 inches.

The lowest average 31-day accumulation is 2.3 inches on November 11.

Over the course of the fall in Folly Beach, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 39 minutes, implying an average daily decrease of 1 minute, 46 seconds, and weekly decrease of 12 minutes, 20 seconds.

The shortest day of the fall is November 30, with 10 hours, 10 minutes of daylight and the longest day is September 1, with 12 hours, 49 minutes of daylight.

The latest sunrise of the fall in Folly Beach is 7:38 AM on November 2 and the earliest sunrise is 59 minutes earlier at 6:39 AM on November 3.

The latest sunset is 7:43 PM on September 1 and the earliest sunset is 2 hours, 30 minutes earlier at 5:13 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on November 3, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 18 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:18 AM and sets 10 hours, 0 minutes later, at 5:18 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the fall of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 Folly Beach is very rapidly decreasing during the fall, falling from 93% to 12% over the course of the season.

For reference, on July 19, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 31, the least muggy day of the year, there are muggy conditions 2% of the time.

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 Folly Beach is rapidly increasing during the fall, increasing from 9.5 miles per hour to 11.5 miles per hour over the course of the season.

For reference, on January 22, the windiest day of the year, the daily average wind speed is 12.5 miles per hour, while on August 17, the calmest day of the year, the daily average wind speed is 9.0 miles per hour.

The wind direction in Folly Beach during the fall is predominantly out of the east from September 1 to October 6 and the north from October 6 to November 30.

Folly Beach 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 Folly Beach is very rapidly decreasing during the fall, falling by 14°F, from 82°F to 69°F, over the course of the season.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Folly Beach typically lasts for 10 months (310 days), from around February 14 to around December 20, rarely starting before January 20 or after March 10, and rarely ending before November 27 or after January 10.

The fall in Folly Beach is very likely fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 86% over the course of the season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Folly Beach are very rapidly increasing during the fall, increasing by 1,660°F, from 4,568°F to 6,228°F, over the course of the season.

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 Folly Beach is very rapidly decreasing during the fall, falling by 2.2 kWh, from 5.2 kWh to 3.0 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Folly Beach are 32.655 deg latitude, -79.940 deg longitude, and 10 ft elevation.

The topography within 2 miles of Folly Beach is essentially flat, with a maximum elevation change of 16 feet and an average elevation above sea level of 2 foot. Within 10 miles is also essentially flat (39 feet). Within 50 miles is essentially flat (509 feet).

The area within 2 miles of Folly Beach is covered by water (65%) and herbaceous vegetation (30%), within 10 miles by water (64%) and herbaceous vegetation (16%), and within 50 miles by water (57%) and trees (21%).