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September Weather in Garrison, United States

Last updated: June 24, 2025

In Garrison, United States, the average temperature in September hovers around 15°C (59°F). However, be prepared for a range; temperatures can dip to a chilly -1°C (30°F) or soar to a steamy 35°C (95°F). Expect about 68 mm (2.7 in) of precipitation spread over 6 days, contributing to an average humidity level of 69%.

September Temperature in Garrison

In September in Garrison, the average temperature is 15°C (59°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as -1°C (30°F). It's advisable to pack for a wide range of weather conditions to fully enjoy your travels in this diverse climate.

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

The chart illustrates September temperature patterns in Garrison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Garrison, September typically has an average temperature of 15°C (59°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec121027375467726859422919
Data source: Temperature data for Garrison 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 Garrison

In Garrison in September, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

September Precipitation Trends in Garrison

The chart displays monthly precipitation patterns in Garrison, 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 Garrison, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec131626263966635768402121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Garrison

In Garrison in September humidity is 69%. With an average temperature of 15°C (59°F), this humidity feels like a mild blanket wrapping around you, making it slightly uncomfortable for traveling; you'll likely find yourself seeking shade and refreshing drinks to stay cool as you explore.

September Average Humidity in Garrison

This chart illustrates the average monthly humidity levels in Garrison, 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 Garrison is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%88%78%75%76%79%78%78%69%71%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Garrison

In Garrison in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Garrison.

Maximum UV Index Levels in Garrison for September

The chart shows the monthly maximum UV Index (UVI) for Garrison 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 Garrison typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245989987532
Data source: Garrison 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 Garrison Compares to Other Months

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

This table compares monthly weather conditions in Garrison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)13 mm (0.5 inches)84%low
February Weather-12°C (10°F)16 mm (0.6 inches)88%moderate
March Weather-3°C (28°F)26 mm (1.0 inches)78%moderate
April Weather3°C (38°F)26 mm (1.0 inches)75%very high
May Weather12°C (54°F)39 mm (1.5 inches)76%very high
June Weather19°C (67°F)66 mm (2.6 inches)79%very high
July Weather22°C (72°F)63 mm (2.5 inches)78%very high
August Weather20°C (68°F)57 mm (2.2 inches)78%very high
September Weather15°C (59°F)68 mm (2.7 inches)69%high
October Weather6°C (43°F)40 mm (1.6 inches)71%moderate
November Weather-2°C (29°F)21 mm (0.8 inches)82%moderate
December Weather-7°C (20°F)21 mm (0.8 inches)84%low

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