Charleston climate

Charleston Weather in August

NOAA 1991-2020 normals for Charleston, 2.4 km from Charleston

Average highs run from 88°F on August 1 to 85°F on August 31, and lows from 66°F to 62°F. Normal precipitation for the month is 2.94 in over about 8 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Charleston, in °F, with the record for each date.406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
87°F
Average low
64°F
Precipitation
2.94 in
Record high
99°FAug 2, 2012
Record low
47°FAug 12, 2004
Chance of a freeze
0%
Days of 90°F or more
8.8
Daylight
14 h 13 min to 13 h 05 min
Cloud cover
48%
Humidity
71%
Dew point
64°F
Wind
7.4 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 188°F66°F94°F 200655°F 201928%0%
Aug 287°F66°F99°F 201255°F 202128%0%
Aug 387°F66°F94°F 201053°F 202528%0%
Aug 487°F66°F96°F 201055°F 200727%0%
Aug 587°F66°F92°F 200250°F 200927%0%
Aug 687°F66°F91°F 200649°F 200427%0%
Aug 787°F65°F95°F 200751°F 200427%0%
Aug 887°F65°F96°F 201254°F 200227%0%
Aug 987°F65°F94°F 200554°F 201727%0%
Aug 1087°F65°F96°F 201055°F 202427%0%
Aug 1187°F65°F96°F 201050°F 200427%0%
Aug 1287°F65°F98°F 200747°F 200427%0%
Aug 1387°F65°F95°F 201050°F 200427%0%
Aug 1487°F65°F93°F 201049°F 200127%0%
Aug 1587°F65°F96°F 200747°F 201127%0%
Aug 1687°F65°F94°F 202550°F 200427%0%
Aug 1787°F65°F94°F 200055°F 201026%0%
Aug 1887°F65°F92°F 202551°F 200726%0%
Aug 1987°F64°F92°F 202553°F 202026%0%
Aug 2087°F64°F91°F 201053°F 201226%0%
Aug 2186°F64°F95°F 200350°F 202426%0%
Aug 2286°F64°F95°F 200750°F 202426%0%
Aug 2386°F64°F97°F 200752°F 202426%0%
Aug 2486°F64°F99°F 202353°F 201526%0%
Aug 2586°F63°F99°F 202352°F 202525%0%
Aug 2686°F63°F95°F 200350°F 202525%0%
Aug 2786°F63°F95°F 200350°F 202525%0%
Aug 2886°F63°F94°F 200755°F 200725%0%
Aug 2986°F63°F97°F 200752°F 200925%0%
Aug 3085°F62°F95°F 201348°F 200925%0%
Aug 3185°F62°F95°F 201348°F 202325%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Charleston, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 5:52 AM, sunset 8:05 PM
August 31
sunrise 6:20 AM, sunset 7:25 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00111436 (Charleston), public domain. Records: NOAA GHCN-Daily, station USW00053802, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.