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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Regional Weather Patterns

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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.

Notable Weather Events

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.

Strong storms and heavy rain can also occur, often as part of traditional weather patterns and not necessarily indicative of tropical weather events. These storms can produce heavy rainfall, with an average of 0.2-0.5 inches of measurable precipitation per event.

Regional Weather Patterns

Charleston's coastal location exposes it to the Atlantic Ocean's influence, which can lead to regional weather patterns. A high-pressure system typically dominates the southeastern United States during late September, contributing to mild temperatures and dry conditions.

However, as the remnants of the Atlantic hurricane season begin to dissipate, low-pressure systems can develop, potentially bringing thunderstorms and heavy rain to the area.

Weather Advisories and Forecasts

The National Weather Service (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.

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.

Preparing for Late September Weather

As a resident or visitor, it's essential to stay informed about the latest weather conditions. Here are some tips to help you prepare:

• Stay up-to-date with the latest weather forecasts and advisories from the National Weather Service.
• Sign up for emergency alerts from local authorities and weather services.
• Keep an emergency kit with essential items, such as flashlights, batteries, and a first aid kit.
• Have a plan in place for potential power outages and other weather-related disruptions.

Conclusion

Late September in Charleston is characterized by mild temperatures, with a gradual decrease in temperature throughout the month. While tropical storms and hurricanes are a potential threat, the likelihood of a direct hit decreases as the calendar rolls closer to October. Staying informed about the latest weather conditions and preparing for potential disruptions can help ensure a safe and enjoyable experience in the Holy City.