Charleston, SC Weather in Late September: What to Expect
As the summer heat begins to dissipate, late September marks a transitional period in Charleston, South Carolina, with mild conditions prevailing throughout the Lowcountry. If you're planning a trip to the Holy City or a local resident looking for some gardening or outdoor inspiration, this article will guide you through the typical weather patterns and seasonal changes you can expect in late September.
Temperature Trends
One of the defining characteristics of late September in Charleston is the gradual decrease in temperature. Daytime highs typically range from the mid-70s to mid-80s (°F), while nighttime lows range from the mid-50s to mid-60s. While temperature fluctuations are common, the average high temperature is around 82°F (28°C), with an average low of 64°F (18°C).
Jarvis Benning, a local meteorologist at the National Weather Service in Charleston, notes that "September is usually a mild month, with fewer extreme temperature swings than during the summer or winter months." According to Benning, temperature anomalies are becoming less common, as the warming trend associated with global climate change is becoming more apparent.
The National Weather Service provides temperature forecasts and trends for Charleston and the surrounding areas. The Climate Prediction Center also provides long-term temperature outlooks and regional climate predictions.
Notable Weather Events
1. Tropical Storms and Hurricanes
Tropical storms and hurricanes are a potential threat to the Charleston area during late September, primarily due to the remaining summer months' tropic activity. Although the likelihood of a direct hit decreases as the calendar rolls closer to October, you should stay informed about the latest weather conditions.
2. Strong Storms and Heavy Rain
While tropical storms and hurricanes are a risk, strong storms with heavy rain and thunder can also occur. These storms are usually a part of traditional weather patterns and not necessarily indicative of tropical weather events. Spring and fall storms can produce heavy rainfall, with an average of 0.2-0.5 inches of measurable precipitation per event.
Tornadoes
Late September in Charleston is outside the peak tornado season in the southeastern United States (April–July). However, tornadoes can occur anywhere, at any time. Typically, these events are downstream from strong tropical systems and represent a significant threat to the local area.
Weather Advisories and Forecasts
1. National Weather Service (NWS) Advisories and Forecasts
The NWS provides timely, specific, and reliable weather forecasts through various tools and mobile applications. The Agency also issues weather advisories, including severe thunderstorm and tornado warnings, advisories, and alerts.
Weather Apps and Tools
The American Red Cross and Weather Channel offer complimentary emergency preparedness information and safety tips for storms and heavy rain in Charleston, and other disaster-prone areas.
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Charleston, SC Weather in Late September: What to Expect
Temperature Trends
Notable Weather Events
Regional Weather Patterns
Weather Advisories and Forecasts
Preparing for Late September Weather
Conclusion