nomadseason

September Weather in Ellisville, United States

Last updated: June 24, 2025

In Ellisville, United States, the average temperature in September is a pleasant 26°C (79°F). However, you can experience a range, with minimums dipping to 11°C (52°F) and maximums soaring up to 38°C (101°F). Expect about 100 mm (3.9 in) of precipitation spread over approximately 10 days, accompanied by an average humidity of around 80%.

September Temperature in Ellisville

In September in Ellisville, the average temperature is 26°C (79°F). Maximum temperatures can reach 38°C (101°F), while the minimum can drop to as low as 11°C (52°F). This makes Ellisville an ideal destination for travelers seeking a warm climate, but be prepared for some cooler evenings.

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

The chart illustrates September temperature patterns in Ellisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ellisville, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec505662667579818179715753
Data source: Temperature data for Ellisville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Ellisville

In Ellisville in September, the precipitation amount is 100 mm (3.9 in) over a span of 10 days.

September Precipitation Trends in Ellisville

The chart displays monthly precipitation patterns in Ellisville, 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 Ellisville, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1171201091301391741331611009779140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Ellisville

In Ellisville in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in Ellisville

This chart illustrates the average monthly humidity levels in Ellisville, 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 Ellisville is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%78%73%71%79%78%80%76%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ellisville

In Ellisville in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Ellisville.

Maximum UV Index Levels in Ellisville for September

The chart shows the monthly maximum UV Index (UVI) for Ellisville 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 Ellisville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111111111110864
Data source: Ellisville 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 Ellisville Compares to Other Months

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

This table compares monthly weather conditions in Ellisville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)117 mm (4.6 inches)82%moderate
February Weather13°C (56°F)120 mm (4.7 inches)80%high
March Weather17°C (62°F)109 mm (4.3 inches)80%very high
April Weather19°C (66°F)130 mm (5.1 inches)78%extreme
May Weather24°C (75°F)139 mm (5.5 inches)73%extreme
June Weather26°C (80°F)174 mm (6.9 inches)71%extreme
July Weather27°C (82°F)133 mm (5.2 inches)79%extreme
August Weather27°C (81°F)161 mm (6.3 inches)78%extreme
September Weather26°C (79°F)100 mm (3.9 inches)80%very high
October Weather22°C (71°F)97 mm (3.8 inches)76%very high
November Weather14°C (57°F)79 mm (3.1 inches)83%high
December Weather12°C (53°F)140 mm (5.5 inches)87%moderate

Compare Ellisville's Climate with Cities Worldwide