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September Weather in Saint Elmo, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Elmo, United States hovers around 22°C (72°F). Expect a delightful range where minimum temperatures dip to 7°C (44°F) and can soar to a maximum of 34°C (93°F). With an average precipitation of 65 mm (2.6 in) over approximately 6 days, and humidity levels reaching up to 79%, it's a month of vibrant weather contrasts!

September Temperature in Saint Elmo

In September in Saint Elmo, the average temperature is 22°C (72°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 7°C (44°F). This pleasant range in temperatures makes Saint Elmo an ideal destination for travelers seeking a comfortable climate.

September Weather in Saint Elmo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint Elmo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Elmo, September typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec323546556776797672594338
Data source: Temperature data for Saint Elmo 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 Saint Elmo

In Saint Elmo, in September, the precipitation amount is 65 mm (2.6 in) over a period of 6 days.

September Precipitation Trends in Saint Elmo

The chart displays monthly precipitation patterns in Saint Elmo, 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 Saint Elmo, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec828613412615310799105651168875
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint Elmo

In Saint Elmo in September humidity is 79%. With an average temperature of 22°C (72°F), this humidity feels like you are enveloped in a warm, heavy blanket, making it feel considerably hotter and adding a layer of stickiness to your skin as you navigate through the streets.

September Average Humidity in Saint Elmo

This chart illustrates the average monthly humidity levels in Saint Elmo, 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 Saint Elmo is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint Elmo

In Saint Elmo 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 Saint Elmo.

Maximum UV Index Levels in Saint Elmo for September

The chart shows the monthly maximum UV Index (UVI) for Saint Elmo 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 Saint Elmo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357911111098643
Data source: Saint Elmo 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 Saint Elmo Compares to Other Months

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

This table compares monthly weather conditions in Saint Elmo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)82 mm (3.2 inches)84%moderate
February Weather2°C (35°F)86 mm (3.4 inches)82%moderate
March Weather8°C (46°F)134 mm (5.3 inches)84%high
April Weather13°C (55°F)126 mm (5.0 inches)83%very high
May Weather20°C (67°F)153 mm (6.0 inches)80%extreme
June Weather25°C (77°F)107 mm (4.2 inches)83%extreme
July Weather26°C (79°F)99 mm (3.9 inches)82%very high
August Weather24°C (76°F)105 mm (4.2 inches)82%very high
September Weather22°C (72°F)65 mm (2.6 inches)79%very high
October Weather15°C (59°F)116 mm (4.5 inches)79%high
November Weather6°C (43°F)88 mm (3.5 inches)88%moderate
December Weather3°C (38°F)75 mm (2.9 inches)87%moderate

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