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September Weather in Foristell, United States

Last updated: June 24, 2025

In Foristell, United States, the average temperature in September is a comfortable 22°C (72°F). However, be prepared for variations, as temperatures can dip as low as 8°C (46°F) and soar to a sizzling 35°C (96°F). During this month, expect around 57 mm (2.3 in) of precipitation spread over 6 days, contributing to an average humidity of 76%. Whether you're soaking in the sun or dodging a rain shower, it's a month full of weather surprises!

September Temperature in Foristell

In September in Foristell, the average temperature is 22°C (72°F). Maximums can reach 35°C (96°F), and minimums can be as low as 8°C (46°F). This varied climate makes it a perfect destination for travelers seeking both warmth and cooler evenings.

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

The chart illustrates September temperature patterns in Foristell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Foristell, September typically has an average temperature of 22°C (72°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec323546556676797672584439
Data source: Temperature data for Foristell 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 Foristell

In Foristell in September, the total precipitation amount is 57 mm (2.3 in), occurring over a span of 6 days.

September Precipitation Trends in Foristell

The chart displays monthly precipitation patterns in Foristell, 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 Foristell, September typically receives around 57 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec717712712315589101145571066750
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Foristell

In Foristell in September humidity is 76%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as you navigate through the thick, saturated air.

September Average Humidity in Foristell

This chart illustrates the average monthly humidity levels in Foristell, 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 Foristell is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Foristell

In Foristell 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 Foristell.

Maximum UV Index Levels in Foristell for September

The chart shows the monthly maximum UV Index (UVI) for Foristell 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 Foristell typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109753
Data source: Foristell 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 Foristell Compares to Other Months

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

This table compares monthly weather conditions in Foristell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)71 mm (2.8 inches)82%moderate
February Weather2°C (35°F)77 mm (3.0 inches)80%moderate
March Weather8°C (47°F)127 mm (5.0 inches)80%high
April Weather13°C (55°F)122 mm (4.8 inches)80%very high
May Weather19°C (67°F)155 mm (6.1 inches)82%very high
June Weather24°C (76°F)89 mm (3.5 inches)83%extreme
July Weather26°C (80°F)101 mm (4.0 inches)81%extreme
August Weather24°C (76°F)145 mm (5.7 inches)80%very high
September Weather22°C (72°F)57 mm (2.3 inches)76%very high
October Weather15°C (59°F)106 mm (4.2 inches)76%high
November Weather7°C (44°F)67 mm (2.6 inches)85%moderate
December Weather4°C (39°F)50 mm (2.0 inches)86%moderate

Compare Foristell's Climate with Cities Worldwide