Charleston climate

Charleston Weather in May

NOAA 1991-2020 normals for Cairo 3N, 19.9 km from Charleston

Average highs run from 75°F on May 1 to 82°F on May 31, and lows from 53°F to 62°F. Normal precipitation for the month is 5.08 in.

May 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.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
78°F
Average low
58°F
Precipitation
5.08 in
Record high
101°FMay 27, 2012
Record low
31°FMay 5, 1976
Chance of a freeze
0%
Days of 90°F or more
1.5
Daylight
13 h 43 min to 14 h 31 min
Cloud cover
63%
Humidity
80%
Dew point
60°F
Wind
8.9 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
May 175°F53°F91°F 195932°F 19600%
May 275°F53°F92°F 201237°F 19600%
May 375°F54°F95°F 201235°F 19760%
May 475°F54°F91°F 195934°F 19570%
May 576°F54°F95°F 201231°F 19760%
May 676°F55°F95°F 201238°F 19890%
May 776°F55°F100°F 201239°F 19580%
May 876°F55°F92°F 196342°F 19800%
May 977°F56°F91°F 196338°F 19800%
May 1077°F56°F93°F 201235°F 19660%
May 1177°F56°F91°F 200537°F 19660%
May 1277°F57°F92°F 200536°F 19600%
May 1378°F57°F94°F 196239°F 19600%
May 1478°F57°F93°F 196244°F 19530%
May 1578°F58°F95°F 201841°F 19730%
May 1678°F58°F94°F 196340°F 19590%
May 1779°F58°F96°F 196239°F 20020%
May 1879°F58°F92°F 196242°F 20020%
May 1979°F59°F96°F 201242°F 19760%
May 2079°F59°F97°F 199842°F 19540%
May 2180°F59°F96°F 197442°F 19540%
May 2280°F60°F94°F 197247°F 19680%
May 2380°F60°F95°F 197542°F 19630%
May 2480°F60°F95°F 199641°F 20010%
May 2581°F61°F98°F 199644°F 19790%
May 2681°F61°F97°F 195344°F 19610%
May 2781°F61°F101°F 201237°F 19610%
May 2881°F61°F99°F 201243°F 19610%
May 2982°F62°F98°F 201245°F 19640%
May 3082°F62°F95°F 195347°F 19520%
May 3182°F62°F96°F 195349°F 19660%

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.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

May 1
sunrise 6:03 AM, sunset 7:46 PM
May 31
sunrise 5:40 AM, sunset 8:11 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093809 (Cairo 3N), public domain. Records: NOAA GHCN-Daily, station USC00237772, 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.