30YearWeather
Charleston in September
Charleston weather in September - United States
😊Warm & Pleasant

Charleston Weather in September

Plan your September trip to Charleston, United States. Based on 30 years of NASA data, expect temperatures of 28°C (high) to 22°C (low), with 31% rain probability and 8 hours of daily sunshine. The Coastal Waters averages 27°C in September. Pack rain gear for around 28 rainy days.

Avg High
28°C

Hottest around day 1

Avg Low
22°C

Coolest around day 30

Rainy Days
28days

31% avg rain chance

Sunshine
8hrs/day

Autumn season

Sea Temperature in September

Coastal Waters(Ocean)

26.8°C

Monthly Average

Water Feel
🌴Tropical

Perfect for swimming and water sports

Swim Rating
Excellent for swimming

Based on average sea surface temperature

Body of Water
Coastal Waters

Ocean

Charleston coastline

Charleston September Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Charleston

Smart Flight Estimator

Airport-to-Airport Logistics

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Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Moderate
44/ 100
Traffic Index

Balanced traffic

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Jan

Monthly Traffic Distribution

82
Jan
88
Feb
107
Mar
104
Apr
121
May
128
Jun
118
Jul
137
Aug
121
Sep
123
Oct
111
Nov
128
Dec
Traffic Level
Low Season

Key Connections

Atlanta Hartsfield Jackson (ATL)
Charlotte Douglas (CLT)
Chicago O'Hare (ORD)
Washington Ronald Reagan National (DCA)
New York John F Kennedy (JFK)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Charleston?

👌Good option with minor considerations
Short Answer

Storm season alert for Charleston in September: beyond the 28°C, 31% rain averages, hurricane risk requires travel insurance and schedule flexibility.

Decision Factors

Atlantic Hurricane season active

Atlantic zone - expect potential atlantic hurricane activity

Warm tropical seas

26.8°C sea temperature - Tropical Bath

Peak tourist season

88% of annual peak - expect crowds and high prices

Plenty of sunshine

9.5h of sunshine daily

Exceptional dining scene

15 Michelin-listed restaurants

Good For

  • 🏖️
    Beach lovers

    26.8°C warm seas and 31% rain probability

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

  • 👴
    Elderly travelers

    79% humidity creates difficult conditions

  • 💼
    Business travelers

    Storm season may cause flight disruptions

900 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Charleston in September averages 28°C with 31% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Charleston in September

What are the temperatures in Charleston in September?

Daytime highs average 28°C, nights drop to 22°C. Temperatures remain fairly consistent.

How many rainy days in Charleston in September?

Expect around 28 days with measurable rainfall. An umbrella is advisable.

What to wear in Charleston in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in Charleston?

This is shoulder season—moderate prices and manageable crowds.