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Average Weather in North Myrtle Beach South Carolina, United States

In North Myrtle Beach, the summers are long, warm, and oppressive; the winters are short, cold, and windy; and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 87°F and is rarely below 25°F or above 92°F.

Climate Summary

coolcoolcomfortablewarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec65%65%44%44%clearovercastprecipitation: 5.8 inprecipitation: 5.8 in2.8 in2.8 inmuggy: 96%muggy: 96%0%0%drydrytourism score: 6.7tourism score: 6.71.71.7
Click on each chart for more information.

Based on the tourism score, the best times of year to visit North Myrtle Beach for warm-weather activities are from mid April to late May and from late September to late October.

Temperature

The hot season lasts for 3.9 months, from May 27 to September 24, with an average daily high temperature above 81°F. The hottest day of the year is July 20, with an average high of 87°F and low of 75°F.

The cool season lasts for 3.0 months, from December 5 to March 4, with an average daily high temperature below 61°F. The coldest day of the year is January 17, with an average low of 38°F and high of 55°F.

Average High and Low Temperature

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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in North Myrtle BeachJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolcoolwarmhotcomfortablecomfortablevery coldvery cold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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.

Çırtıman, Turkey (6,025 miles away); Behshahr, Iran (6,683 miles); and Miyazaki, Japan (7,499 miles) are the far-away foreign places with temperatures most similar to North Myrtle Beach (view comparison).

Clouds

In North Myrtle Beach, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in North Myrtle Beach begins around September 1 and lasts for 3.3 months, ending around December 10. On October 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.

The cloudier part of the year begins around December 10 and lasts for 8.7 months, ending around September 1. On July 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

Cloud Cover Categories

Cloud Cover Categories in North Myrtle BeachclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2765%Oct 2765%Jul 2744%Jul 2744%Sep 154%Sep 154%Dec 1055%Dec 1055%clearmostly clearpartly cloudymostly cloudyovercast
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. The chance of wet days in North Myrtle Beach varies significantly throughout the year.

The wetter season lasts 3.4 months, from June 7 to September 19, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 52% on August 5.

The drier season lasts 8.6 months, from September 19 to June 7. The smallest chance of a wet day is 21% on October 30.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 52% on August 5.

Daily Chance of Precipitation

Daily Chance of Precipitation in North Myrtle BeachwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 552%Aug 552%Oct 3021%Oct 3021%Jan 126%Jan 126%Jun 736%Jun 736%Sep 1936%Sep 1936%rain
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. North Myrtle Beach experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in North Myrtle Beach. The most rain falls during the 31 days centered around September 1, with an average total accumulation of 5.8 inches.

The least rain falls around April 29, with an average total accumulation of 2.8 inches.

Average Monthly Rainfall

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

The length of the day in North Myrtle Beach varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 54 minutes of daylight; the longest day is June 21, with 14 hours, 24 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in North Myrtle BeachJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 24 minJun 2114 hr, 24 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 54 minDec 219 hr, 54 minDec 21nightnightday
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 is at 6:03 AM on June 12, and the latest sunrise is 1 hour, 32 minutes later at 7:35 AM on November 3. The earliest sunset is at 5:05 PM on December 4, and the latest sunset is 3 hours, 24 minutes later at 8:29 PM on June 29.

Daylight saving time (DST) is observed in North Myrtle Beach during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in North Myrtle BeachJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 126:03 AMJun 126:03 AM8:29 PMJun 298:29 PMJun 29Dec 45:05 PMDec 45:05 PM7:35 AMNov 37:35 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

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.

North Myrtle Beach experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.5 months, from May 3 to October 19, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 23, with muggy conditions 96% of the time.

The least muggy day of the year is January 25, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in North Myrtle BeachmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 250%Jan 250%96%Jul 2396%Jul 23May 324%May 324%Oct 1924%Oct 1924%miserablemiserableoppressiveoppressivedrydryhumidhumidmuggymuggy
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 North Myrtle Beach experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from November 1 to May 9, with average wind speeds of more than 10.2 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 12.0 miles per hour.

The calmer time of year lasts for 5.7 months, from May 9 to November 1. The calmest day of the year is August 9, with an average hourly wind speed of 8.4 miles per hour.

Average Wind Speed

Average Wind Speed in North Myrtle BeachwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mphFeb 2612.0 mphFeb 2612.0 mphAug 98.4 mphAug 98.4 mphNov 110.2 mphNov 110.2 mphMay 910.2 mphMay 910.2 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in North Myrtle Beach varies throughout the year.

The wind is most often from the south for 5.4 months, from March 16 to August 27, with a peak percentage of 51% on July 11. The wind is most often from the east for 4.1 weeks, from August 27 to September 25, with a peak percentage of 35% on September 7. The wind is most often from the north for 5.7 months, from September 25 to March 16, with a peak percentage of 38% on January 1.

Wind Direction

Wind Direction in North Myrtle BeachNSENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
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

North Myrtle 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 16 to September 26, with an average temperature above 79°F. The day of the year with the warmest water is August 7, with an average temperature of 82°F.

The time of year with cooler water lasts for 4.6 months, from December 5 to April 24, with an average temperature below 68°F. The day of the year with the coolest water is February 19, with an average temperature of 64°F.

Average Water Temperature

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

Best Time of Year to Visit

To characterize how pleasant the weather is in North Myrtle Beach throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit North Myrtle Beach for general outdoor tourist activities are from mid April to late May and from late September to late October, with a peak score in the second week of May.

Tourism Score

Tourism Score in North Myrtle Beachbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.76.71.71.76.46.43.93.9 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit North Myrtle Beach for hot-weather activities are from mid May to mid July and from early August to late September, with a peak score in the third week of June.

Beach/Pool Score

Beach/Pool Score in North Myrtle Beachbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.95.90.10.15.85.85.25.2 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing 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 North Myrtle Beach typically lasts for 8.5 months (262 days), from around March 12 to around November 29, rarely starting before February 16 or after April 2, and rarely ending before November 11 or after December 19.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in North Myrtle Beachgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1250%Mar 1250%Nov 2950%Nov 2990%Apr 290%Apr 290%Nov 1190%Nov 1110%Feb 1610%Feb 1610%Dec 1910%Dec 190%Jan 60%Jan 6Aug 1100%Aug 1100%very coldcoldcoolcomfortablewarmhot
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing 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.

Based on growing degree days alone, the first spring blooms in North Myrtle Beach should appear around February 2, only rarely appearing before January 19 or after February 21.

Growing Degree Days

Growing Degree Days in North Myrtle BeachJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°FFeb 288°FFeb 288°FMay 6900°FMay 6900°FJun 151,800°FJun 151,800°FDec 315,728°FDec 315,728°F
The average growing degree days accumulated over the course of the year, 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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.0 months, from April 8 to July 9, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is May 14, with an average of 6.7 kWh.

The darker period of the year lasts for 2.8 months, from November 11 to February 6, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 25, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in North Myrtle BeachbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 146.7 kWhMay 146.7 kWhDec 252.6 kWhDec 252.6 kWhApr 85.9 kWhApr 85.9 kWhJul 95.9 kWhJul 95.9 kWhFeb 63.4 kWhFeb 63.4 kWh
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 North Myrtle Beach are 33.816 deg latitude, -78.680 deg longitude, and 3 ft elevation.

The topography within 2 miles of North Myrtle Beach is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 10 feet. Within 10 miles is essentially flat (184 feet). Within 50 miles also contains only modest variations in elevation (266 feet).

The area within 2 miles of North Myrtle Beach is covered by water (49%) and artificial surfaces (46%), within 10 miles by water (48%) and trees (27%), and within 50 miles by water (42%) and trees (32%).

Data Sources

This report illustrates the typical weather in North Myrtle Beach, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in North Myrtle Beach.

For each station, the records are corrected for the elevation difference between that station and North Myrtle Beach 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 North Myrtle Beach is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between North Myrtle Beach and a given station.

The stations contributing to this reconstruction are: Grand Strand Airport (96%, 4.1 kilometers, west); Columbus County Municipal Airport (2.2%, 51 kilometers, north); and Cape Fear Regional Jetport/Howie Franklin Field (1.9%, 57 kilometers, east).

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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.