9月、マートルビーチの平均気温は？

When planning a coastal getaway, many travelers ask: what is the average temperature in Myrtle Beach in September? As summer fades into fall, Myrtle Beach remains a popular destination due to its warm temperatures, pleasant ocean breezes, and fewer crowds. In this in-depth guide, we’ll explore the weather trends, average surface temperature, and other key weather data to help you plan your trip wisely.

Myrtle Beach in September: Overview

Myrtle Beach is one of the most beloved coastal towns on the East Coast. September marks the start of shoulder season when families return home and the beaches open up for visitors seeking tranquility and milder temperatures. But before you book your stay, it’s important to know what to expect when it comes to the average temperature.

What Is the Average Temperature in Myrtle Beach in September?

According to historical weather data, the average temperature in Myrtle Beach in September typically ranges from 68°F (20°C) in the mornings to around 83°F (28°C) during the afternoon. This comfortable range makes it ideal for swimming, sunbathing, and outdoor dining.

The average surface temperature of the Atlantic Ocean is still inviting, often hovering near 80°F (27°C). Many travelers find these water temperatures perfect for swimming or trying out water sports before the chillier months arrive.

Average Surface Temperature of the Ocean

In September, the average surface temperature off Myrtle Beach remains warm enough to enjoy water activities without discomfort. Surfers, paddleboarders, and swimmers flock to Myrtle Beach throughout the year, but September offers an exceptional balance of warm ocean water and pleasant air temperatures.

Average Temperature Trends Throughout the Year

To better understand what is the average temperature in Myrtle Beach in September, it helps to look at how it compares throughout the year. Myrtle Beach enjoys mild winters and hot, humid summers. Here’s how temperatures typically shift:

• Winter: Average highs hover around 57°F (14°C).
• Spring: Average temperatures steadily climb from the low 60s to mid-70s.
• Summer: July and August bring peak heat with average highs reaching the upper 80s.
• Fall: September temperatures begin to cool gradually, maintaining warm days and cooler nights.

This seasonal pattern makes Myrtle Beach a desirable destination throughout the year for different kinds of travelers.

Wind Speed and Wind Vector Speed

Wind speed also plays a role in how the temperatures feel. In September, Myrtle Beach experiences moderate wind speeds that help balance the warm days. The wind vector speed averages about 8–12 mph, adding a gentle coastal breeze that makes afternoons by the beach more enjoyable.

Cloud Cover and Sunshine Hours

Another important weather factor is cloud cover. Myrtle Beach in September has moderate cloud cover, meaning plenty of sunny days mixed with partly cloudy afternoons. The cloudiest month tends to be January, so September falls on the sunnier side. Visitors can expect about 8–9 hours of daylight, giving plenty of time for activities on the beach.

Dew Point and Humidity Levels

Humidity can make a big difference in how the average temperature feels. The dew point in Myrtle Beach during September generally stays around 66°F, creating mild to moderate humidity levels. High dew point days can make the air feel warmer, especially during peak afternoon hours. Travelers sensitive to humidity may find the early mornings and evenings more comfortable.

Weather Stations and Reliable Data

Weather data for Myrtle Beach comes from multiple weather stations strategically positioned along the coast. These weather stations record real-time temperatures, wind speed, dew point, cloud cover, and other vital statistics. Relying on this weather data helps visitors make informed decisions made about when to visit and what activities to plan.

Average Daily Temperatures and Precipitation

Myrtle Beach in September usually sees occasional rain showers due to tropical influences. The average daily chance of rain hovers around 20%, often in short afternoon bursts that quickly give way to sunshine. It’s wise to check weather reports before heading out for daily beach plans or water sports.

Average Surface Temperature vs. Air Temperature

While many people focus on the air temperature, the average surface temperature of the water is equally important for travelers. With an average surface temperature close to 80°F, the ocean remains warm enough for comfortable swimming. Many families enjoy Myrtle Beach during this month because the water temperature is warmer than during spring or late fall.

How Wind Speed and Cloud Cover Affect Comfort

Moderate wind speed and partial cloud cover help keep the average temperature from feeling too hot. A clear day with no wind can make the sun feel intense, but a steady coastal breeze and scattered clouds offer relief during midday hours.

Average Temperature: Day vs. Night

One of the highlights of September weather in Myrtle Beach is the comfortable transition from day to night. While daytime highs can reach 83°F, evenings cool down to the high 60s or low 70s, making outdoor dining or evening beach walks pleasant without needing heavy layers.

Average Temperature Compared to Summer Months

Compared to July or August, when Myrtle Beach sees peak highs near 90°F and higher humidity levels, September feels milder and less oppressive. Visitors often say September strikes the perfect balance between summer heat and fall’s cool breezes.

How the Dew Point Plays a Role

The dew point is a useful measure for predicting how sticky the air will feel. In September, Myrtle Beach’s dew point remains moderate. When the dew point rises above 65°F, the air starts feeling humid. Fortunately, the sea breeze and frequent afternoon showers help keep the atmosphere comfortable.

Historical Weather Data: A Look Back

Over the past 10 years, the average temperature for Myrtle Beach in September has stayed consistent, with only slight fluctuations. Historical weather data indicates that major deviations are rare, making it easy to plan activities with confidence.

Wind Speed Patterns Throughout the Year

Wind speed varies throughout the year but generally remains steady in September. Average wind speeds of 8–12 mph make the beach atmosphere refreshing, especially when paired with ocean waves and mild humidity.

Weather Data from Local Weather Stations

Local weather stations have been monitoring Myrtle Beach for decades. These stations collect extensive weather data, including wind vector speed, dew point, cloud cover, and temperatures. By comparing the average daily readings from different stations, meteorologists can deliver reliable weather reports.

Making the Most of Myrtle Beach Weather

Planning your trip around the average temperature and average surface temperature helps ensure you get the best experience Myrtle Beach has to offer. With warm days, mild evenings, and inviting ocean temperatures, September is one of the most versatile months to visit.

Average Rainfall and Cloud Cover

September can bring occasional rain showers, averaging about 5 inches of precipitation for the month. However, these showers are usually brief and can provide a welcome break from the sun. The cloud cover often shifts rapidly, so travelers can enjoy both sunny skies and cooling clouds throughout the day.

Average Snowfall: Not a Concern

While average snowfall is an important factor for northern destinations, Myrtle Beach rarely sees snow, and certainly not in September. Visitors can leave the winter coats behind and pack swimsuits instead.

Weather Reports and Planning Tips

Before your visit, it’s wise to check updated weather reports. Look for current weather data on wind speed, dew point, and cloud cover to pack accordingly. Myrtle Beach’s reliable weather patterns mean there are few surprises, but sudden showers can pop up in late afternoons.

How the Average Temperature Impacts Activities

The average temperature in Myrtle Beach in September allows for a wide range of outdoor activities, from fishing to golfing to beach lounging. Early mornings are ideal for long walks, while midday is perfect for swimming when ocean temperatures reach their peak.

Final Thoughts on Myrtle Beach in September

So, what is the average temperature in Myrtle Beach in September? With warm afternoons, mild evenings, and an inviting ocean, this month is an excellent time to visit. The combination of moderate wind speed, pleasant dew point, and manageable cloud cover ensures visitors enjoy all the perks of the coast without the sweltering heat of midsummer.