Greencastle climate

Greencastle Weather in September

NOAA 1991-2020 normals for Hagerstown Washington CO AP, 9.1 km from Greencastle

Average highs run from 82°F on September 1 to 72°F on September 30, and lows from 63°F to 54°F. Normal precipitation for the month is 3.83 in over about 10 wet days.

September day by day

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

Normal daily high and low temperature at Greencastle, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
59°F
Precipitation
3.83 in
Record high
97°FSep 2, 2010
Record low
37°FSep 30, 2000
Chance of a freeze
0%
Days of 90°F or more
2.0
Daylight
13 h 03 min to 11 h 49 min
Cloud cover
57%
Humidity
71%
Dew point
54°F
Wind
5.1 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 182°F63°F96°F 201051°F 200931%0%
Sep 282°F63°F97°F 201052°F 200931%0%
Sep 382°F63°F97°F 201052°F 202131%0%
Sep 482°F63°F97°F 202350°F 202431%0%
Sep 581°F62°F96°F 202352°F 202431%0%
Sep 681°F62°F96°F 202345°F 200031%0%
Sep 781°F62°F93°F 201050°F 200031%0%
Sep 881°F61°F94°F 201646°F 202531%0%
Sep 980°F61°F94°F 201647°F 202431%0%
Sep 1080°F61°F94°F 201648°F 201731%0%
Sep 1180°F61°F93°F 201947°F 201231%0%
Sep 1279°F60°F93°F 201952°F 199930%0%
Sep 1379°F60°F89°F 200550°F 200230%0%
Sep 1479°F60°F90°F 201646°F 201430%0%
Sep 1578°F59°F89°F 200543°F 200130%0%
Sep 1678°F59°F88°F 201944°F 200130%0%
Sep 1778°F59°F87°F 200542°F 200730%0%
Sep 1877°F58°F87°F 202143°F 201330%0%
Sep 1977°F58°F89°F 202544°F 202030%0%
Sep 2076°F58°F87°F 201638°F 202030%0%
Sep 2176°F57°F88°F 201939°F 202030%0%
Sep 2276°F57°F95°F 201040°F 202030%0%
Sep 2375°F57°F92°F 201043°F 201430%0%
Sep 2475°F56°F95°F 201042°F 201330%0%
Sep 2574°F56°F92°F 201744°F 201230%0%
Sep 2674°F55°F91°F 200743°F 200131%0%
Sep 2774°F55°F92°F 201739°F 200031%0%
Sep 2873°F55°F89°F 201944°F 200131%0%
Sep 2973°F54°F83°F 201938°F 200031%0%
Sep 3072°F54°F79°F 202537°F 200031%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Greencastle, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:39 AM, sunset 7:42 PM
September 30
sunrise 7:06 AM, sunset 6:55 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00093706 (Hagerstown Washington CO AP), public domain. Records: NOAA GHCN-Daily, station USW00093706, 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.