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September Weather in Freeport, United States

Last updated: June 24, 2025

In Freeport, United States, the average temperature in September is a pleasant 19°C (67°F). However, be prepared for temperature variations, with a minimum of 2°C (36°F) and highs reaching 33°C (92°F). This month sees 122 mm (4.8 in) of precipitation spread over approximately 10 days, contributing to an average humidity of 79%. Be sure to pack accordingly!

September Temperature in Freeport

In September in Freeport, the average temperature is 19°C (67°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 2°C (36°F). This range makes it a great time to visit for those who enjoy mild weather but should be prepared for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Freeport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Freeport, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec222538476172757266523731
Data source: Temperature data for Freeport 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 Freeport

In Freeport in September, the total precipitation amount reaches 122 mm (4.8 in) over the course of 10 days.

September Precipitation Trends in Freeport

The chart displays monthly precipitation patterns in Freeport, 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 Freeport, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec59577210215011880881221114650
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Freeport

In Freeport in September, humidity is 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

September Average Humidity in Freeport

This chart illustrates the average monthly humidity levels in Freeport, 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 Freeport is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Freeport

In Freeport 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 Freeport.

Maximum UV Index Levels in Freeport for September

The chart shows the monthly maximum UV Index (UVI) for Freeport 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 Freeport typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Freeport 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 Freeport Compares to Other Months

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

This table compares monthly weather conditions in Freeport, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)59 mm (2.3 inches)85%moderate
February Weather-4°C (25°F)57 mm (2.2 inches)85%moderate
March Weather3°C (38°F)72 mm (2.8 inches)85%high
April Weather9°C (48°F)102 mm (4.0 inches)85%very high
May Weather16°C (61°F)150 mm (5.9 inches)78%very high
June Weather22°C (72°F)118 mm (4.7 inches)80%very high
July Weather24°C (76°F)80 mm (3.2 inches)78%very high
August Weather22°C (72°F)87 mm (3.4 inches)76%very high
September Weather19°C (67°F)122 mm (4.8 inches)79%very high
October Weather11°C (53°F)111 mm (4.4 inches)83%moderate
November Weather3°C (38°F)46 mm (1.8 inches)88%moderate
December Weather-1°C (31°F)50 mm (2.0 inches)81%low

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