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September Weather in Greencastle, United States

Last updated: June 24, 2025

In Greencastle, United States during September, the average temperature hovers around 21°C (70°F), with a minimum of 6°C (43°F) and a maximum reaching 33°C (92°F). Expect some precipitation too, with around 69 mm (2.7 in) falling over 6 days. Overall, the average humidity sits at a comfortable 69%, making it a pleasant month to explore!

September Temperature in Greencastle

In September in Greencastle, the average temperature is 21°C (70°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (43°F). This weather makes Greencastle an ideal destination for travelers seeking pleasant temperatures and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Greencastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greencastle, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec303343526473777470574136
Data source: Temperature data for Greencastle 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 Greencastle

In Greencastle in September, the precipitation amount is 69 mm (2.7 in) over a period of 6 days.

September Precipitation Trends in Greencastle

The chart displays monthly precipitation patterns in Greencastle, 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 Greencastle, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec8491126101141108101104691118982
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Greencastle

In Greencastle in September humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

September Average Humidity in Greencastle

This chart illustrates the average monthly humidity levels in Greencastle, 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 Greencastle 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 Greencastle

In Greencastle 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 Greencastle.

Maximum UV Index Levels in Greencastle for September

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

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

This table compares monthly weather conditions in Greencastle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)84 mm (3.3 inches)87%moderate
February Weather1°C (33°F)91 mm (3.6 inches)85%moderate
March Weather6°C (43°F)126 mm (5.0 inches)86%high
April Weather11°C (52°F)101 mm (4.0 inches)84%very high
May Weather18°C (65°F)141 mm (5.6 inches)79%very high
June Weather23°C (74°F)108 mm (4.3 inches)82%extreme
July Weather25°C (77°F)101 mm (4.0 inches)79%very high
August Weather23°C (74°F)104 mm (4.1 inches)70%very high
September Weather21°C (70°F)69 mm (2.7 inches)69%very high
October Weather14°C (58°F)111 mm (4.4 inches)76%high
November Weather5°C (42°F)89 mm (3.5 inches)88%moderate
December Weather2°C (36°F)82 mm (3.2 inches)87%moderate

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