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September Weather in Big Flats, United States

Last updated: June 24, 2025

In September, the average temperature in Big Flats, United States is a comfortable 17°C (63°F). However, temperatures can vary widely, with lows reaching as chilly as 0°C (33°F) and highs soaring up to 33°C (91°F). Be prepared for some rain, as the area receives an average of 84 mm (3.3 in) of precipitation over 9 days. With an average humidity of 78%, expect a mild and sometimes humid climate during this month.

September Temperature in Big Flats

In September in Big Flats, the average temperature is 17°C (63°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 0°C (33°F). Be prepared for a wide range of temperatures during your travels to Big Flats this September.

September Weather in Big Flats: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Big Flats, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Big Flats, September typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec262835465866727063533831
Data source: Temperature data for Big Flats 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 Big Flats

In Big Flats in September, the precipitation amount is 84 mm (3.3 in) spread over 9 days.

September Precipitation Trends in Big Flats

The chart displays monthly precipitation patterns in Big Flats, 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 Big Flats, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec6683781101189513084841317782
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Big Flats

In Big Flats in September, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

September Average Humidity in Big Flats

This chart illustrates the average monthly humidity levels in Big Flats, 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 Big Flats is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Big Flats

In Big Flats 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 Big Flats.

Maximum UV Index Levels in Big Flats for September

The chart shows the monthly maximum UV Index (UVI) for Big Flats 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 Big Flats typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Big Flats 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 Big Flats Compares to Other Months

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

This table compares monthly weather conditions in Big Flats, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)66 mm (2.6 inches)90%moderate
February Weather-2°C (28°F)83 mm (3.3 inches)90%moderate
March Weather1°C (35°F)78 mm (3.1 inches)87%high
April Weather8°C (46°F)110 mm (4.3 inches)88%very high
May Weather14°C (58°F)118 mm (4.6 inches)82%very high
June Weather19°C (67°F)95 mm (3.7 inches)79%very high
July Weather22°C (72°F)130 mm (5.1 inches)78%very high
August Weather21°C (70°F)84 mm (3.3 inches)76%very high
September Weather17°C (63°F)84 mm (3.3 inches)78%very high
October Weather11°C (53°F)131 mm (5.2 inches)84%high
November Weather3°C (38°F)77 mm (3.0 inches)89%moderate
December Weather-1°C (31°F)82 mm (3.2 inches)86%low

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