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October Weather in Charleston, United States

Last updated: June 24, 2025

In Charleston, United States, the average temperature in October hovers around 18°C (65°F). Be prepared for a wide range of temperatures, with minimums dipping to -1°C (30°F) and maximums soaring to 37°C (98°F). Rainfall is not uncommon, with an average precipitation of 124 mm (4.9 in) spread over 9 days. Expect a high humidity level of 80%, making for a warm and often muggy atmosphere.

October Temperature in Charleston

In October in Charleston, the average temperature is 18°C (65°F). The maximum can reach 37°C (98°F), and the minimum can be as low as -1°C (30°F). It's essential to pack for a wide range of weather conditions when traveling during this time.

October Weather in Charleston: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Charleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Charleston, October typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (98°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854617076807874645046
Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Charleston

In Charleston in October, the precipitation amount is 124 mm (4.9 in) over the course of 9 days.

October Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Charleston, October typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec94165157149111991031269412475129
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Charleston

In Charleston in October, humidity is 80%. With an average temperature of 18°C (65°F), this humidity feels like wandering through a warm, damp blanket, making every step slightly heavy and resulting in a constant sheen of sweat, which can be both refreshing and exhausting for travelers.

October Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Charleston is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Charleston

In Charleston in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Charleston.

Maximum UV Index Levels in Charleston for October

The chart shows the monthly maximum UV Index (UVI) for Charleston in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Charleston typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109763
Data source: Charleston October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Charleston Compares to Other Months

Weather in Charleston varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Charleston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Charleston, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)94 mm (3.7 inches)86%moderate
February Weather9°C (48°F)165 mm (6.5 inches)86%high
March Weather12°C (54°F)157 mm (6.2 inches)86%very high
April Weather16°C (61°F)149 mm (5.9 inches)82%very high
May Weather21°C (71°F)111 mm (4.4 inches)85%extreme
June Weather24°C (76°F)99 mm (3.9 inches)85%extreme
July Weather27°C (80°F)103 mm (4.1 inches)83%extreme
August Weather26°C (78°F)126 mm (5.0 inches)76%very high
September Weather24°C (75°F)94 mm (3.7 inches)76%very high
October Weather18°C (65°F)124 mm (4.9 inches)80%high
November Weather10°C (51°F)75 mm (2.9 inches)88%high
December Weather8°C (47°F)129 mm (5.1 inches)88%moderate

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