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September Weather in Grand Tower, United States

Last updated: June 24, 2025

In September, the average temperature in Grand Tower, United States is a pleasant 23°C (73°F). However, temperatures can vary significantly, ranging from a cool 8°C (47°F) to a sweltering 35°C (96°F). During this time, expect about 74 mm (2.9 in) of precipitation over 7 days, contributing to an average humidity of 75%.

September Temperature in Grand Tower

In September in Grand Tower, the average temperature is 23°C (73°F). Maximums can reach 35°C (96°F) and minimums can be as low as 8°C (47°F). This mild climate makes it an ideal time to explore and enjoy outdoor activities in Grand Tower.

September Weather in Grand Tower: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grand Tower, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand Tower, September typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec353849566877807773604541
Data source: Temperature data for Grand Tower 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 Grand Tower

In Grand Tower in September, the precipitation amount is 74 mm (2.9 in) over a period of 7 days.

September Precipitation Trends in Grand Tower

The chart displays monthly precipitation patterns in Grand Tower, 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 Grand Tower, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec95111143150145889094741158982
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grand Tower

In Grand Tower in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Grand Tower

This chart illustrates the average monthly humidity levels in Grand Tower, 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 Grand Tower is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%84%80%82%83%80%76%75%75%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grand Tower

In Grand Tower in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Grand Tower.

Maximum UV Index Levels in Grand Tower for September

The chart shows the monthly maximum UV Index (UVI) for Grand Tower 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 Grand Tower typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679111110109753
Data source: Grand Tower 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 Grand Tower Compares to Other Months

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

This table compares monthly weather conditions in Grand Tower, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)95 mm (3.7 inches)86%moderate
February Weather3°C (38°F)111 mm (4.4 inches)84%high
March Weather9°C (49°F)143 mm (5.6 inches)84%high
April Weather14°C (57°F)150 mm (5.9 inches)80%very high
May Weather20°C (68°F)145 mm (5.7 inches)82%extreme
June Weather25°C (77°F)88 mm (3.5 inches)83%extreme
July Weather27°C (80°F)89 mm (3.5 inches)79%very high
August Weather25°C (77°F)94 mm (3.7 inches)76%very high
September Weather23°C (73°F)74 mm (2.9 inches)75%very high
October Weather16°C (61°F)115 mm (4.5 inches)74%high
November Weather7°C (46°F)89 mm (3.5 inches)85%moderate
December Weather5°C (41°F)82 mm (3.2 inches)88%moderate

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