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September Weather in Hagerstown, United States

Last updated: June 24, 2025

In Hagerstown, United States, the average temperature in September is a pleasant 20°C (69°F). Temperatures can vary, with a minimum of 5°C (41°F) and a maximum reaching 33°C (91°F). Expect around 89 mm (3.5 in) of precipitation over approximately 7 days, accompanied by an average humidity level of 69%.

September Temperature in Hagerstown

In September in Hagerstown, the average temperature is 20°C (69°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 5°C (41°F). This diverse temperature range makes it an ideal time for travelers to enjoy both outdoor adventures and cozy indoor activities.

September Weather in Hagerstown: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hagerstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hagerstown, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec293342516372757369574135
Data source: Temperature data for Hagerstown 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.

September Precipitation in Hagerstown

In Hagerstown in September, the total precipitation amount is 89 mm (3.5 in) spread over a period of 7 days.

September Precipitation Trends in Hagerstown

The chart displays monthly precipitation patterns in Hagerstown, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Hagerstown, September typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec79991209914012011293891029381
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hagerstown

In Hagerstown in September humidity is 69%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping embrace, making travel feel both refreshing and slightly sticky, as you navigate the vibrant atmosphere with a pleasant sheen of perspiration glistening on your skin.

September Average Humidity in Hagerstown

This chart illustrates the average monthly humidity levels in Hagerstown, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Hagerstown is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hagerstown

In Hagerstown in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Hagerstown.

Maximum UV Index Levels in Hagerstown for September

The chart shows the monthly maximum UV Index (UVI) for Hagerstown in September, 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 September, the maximum UV index in Hagerstown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Hagerstown September 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 September Weather in Hagerstown Compares to Other Months

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

This table compares monthly weather conditions in Hagerstown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)78 mm (3.1 inches)87%moderate
February Weather0°C (33°F)99 mm (3.9 inches)85%moderate
March Weather5°C (42°F)120 mm (4.7 inches)86%high
April Weather11°C (51°F)99 mm (3.9 inches)84%very high
May Weather17°C (64°F)140 mm (5.5 inches)79%very high
June Weather22°C (72°F)120 mm (4.7 inches)82%extreme
July Weather24°C (76°F)112 mm (4.4 inches)79%very high
August Weather23°C (73°F)93 mm (3.7 inches)70%very high
September Weather20°C (69°F)89 mm (3.5 inches)69%very high
October Weather14°C (57°F)101 mm (4.0 inches)76%high
November Weather5°C (41°F)93 mm (3.7 inches)88%moderate
December Weather2°C (35°F)81 mm (3.2 inches)87%moderate

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