Mount Pleasant climate

Mount Pleasant Weather in September

NOAA 1991-2020 normals for Sullivans Is, 3.6 km from Mount Pleasant

Average highs run from 89°F on September 1 to 83°F on September 30, and lows from 71°F to 64°F. Normal precipitation for the month is 5.47 in.

September day by day

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

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

September at a glance

Average high
86°F
Average low
68°F
Precipitation
5.47 in
Record high
99°FSep 10, 2010
Record low
46°FSep 22, 2008
Chance of a freeze
0%
Days of 90°F or more
6.4
Daylight
12 h 50 min to 11 h 52 min
Cloud cover
54%
Humidity
80%
Dew point
69°F
Wind
6.3 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
Sep 189°F71°F96°F 195862°F 19990%
Sep 288°F70°F96°F 199157°F 19680%
Sep 388°F70°F96°F 201255°F 20070%
Sep 488°F70°F97°F 196163°F 19790%
Sep 588°F70°F97°F 202057°F 20070%
Sep 688°F70°F95°F 198360°F 19970%
Sep 788°F70°F97°F 197060°F 19880%
Sep 888°F70°F97°F 201260°F 19880%
Sep 987°F69°F96°F 201057°F 19560%
Sep 1087°F69°F99°F 201054°F 19720%
Sep 1187°F69°F94°F 198556°F 19560%
Sep 1287°F69°F94°F 199161°F 19670%
Sep 1387°F69°F90°F 195358°F 19670%
Sep 1486°F68°F94°F 197254°F 19850%
Sep 1586°F68°F94°F 197058°F 19690%
Sep 1686°F68°F96°F 200859°F 19610%
Sep 1786°F68°F94°F 197257°F 19610%
Sep 1886°F67°F95°F 195858°F 19690%
Sep 1985°F67°F92°F 201952°F 19810%
Sep 2085°F67°F91°F 201650°F 20080%
Sep 2185°F67°F96°F 201048°F 20080%
Sep 2285°F66°F95°F 198846°F 20080%
Sep 2384°F66°F94°F 201854°F 19830%
Sep 2484°F66°F95°F 201854°F 19630%
Sep 2584°F65°F94°F 201856°F 19810%
Sep 2684°F65°F94°F 201851°F 20080%
Sep 2784°F65°F91°F 201953°F 19840%
Sep 2883°F64°F94°F 201851°F 19930%
Sep 2983°F64°F92°F 201748°F 19700%
Sep 3083°F64°F91°F 201849°F 19670%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mount Pleasant, 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 (EDT).

September 1
sunrise 6:54 AM, sunset 7:44 PM
September 30
sunrise 7:13 AM, sunset 7:05 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00388405 (Sullivans Is), public domain. Records: NOAA GHCN-Daily, station USC00388405, 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.