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September Weather in Glendora, United States

Last updated: June 24, 2025

In Glendora, United States, the average temperature in September hovers around 23°C (73°F), offering a pleasant climate. However, be prepared for temperature fluctuations, with minimums dipping to 9°C (48°F) and maximums soaring to 42°C (108°F). Additionally, you can expect 6 mm (0.2 in) of precipitation over the course of just 1 day, accompanied by an average humidity level of 48%.

September Temperature in Glendora

In September in Glendora, the average temperature is 23°C (73°F). Maximum can reach 42°C (108°F) and minimum can be as low as 9°C (48°F). Be prepared for a wide range of temperatures when traveling during this month, as both heat and cool conditions can occur.

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

The chart illustrates September temperature patterns in Glendora, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glendora, September typically has an average temperature of 23°C (73°F), with highs reaching up to 42°C (108°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec505052596270777773655850
Data source: Temperature data for Glendora 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 Glendora

In Glendora in September, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

September Precipitation Trends in Glendora

The chart displays monthly precipitation patterns in Glendora, 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 Glendora, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec777379252136106112579
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glendora

In Glendora in September humidity is 48%. With an average temperature of 23°C (73°F), this humidity feels like a pleasant embrace, making it comfortable for traveling while allowing you to enjoy outdoor activities without feeling overly sticky or weighed down.

September Average Humidity in Glendora

This chart illustrates the average monthly humidity levels in Glendora, 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 Glendora is approximately 48%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%82%76%68%58%52%46%39%48%59%72%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glendora

In Glendora 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 Glendora.

Maximum UV Index Levels in Glendora for September

The chart shows the monthly maximum UV Index (UVI) for Glendora 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 Glendora typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
Data source: Glendora 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 Glendora Compares to Other Months

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

This table compares monthly weather conditions in Glendora, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)77 mm (3.0 inches)78%moderate
February Weather10°C (50°F)73 mm (2.9 inches)82%high
March Weather11°C (53°F)79 mm (3.1 inches)75%very high
April Weather15°C (59°F)25 mm (1.0 inches)68%very high
May Weather17°C (62°F)20 mm (0.8 inches)57%extreme
June Weather21°C (71°F)3 mm (0.1 inches)52%extreme
July Weather25°C (77°F)6 mm (0.2 inches)46%extreme
August Weather25°C (77°F)9 mm (0.4 inches)39%extreme
September Weather23°C (73°F)6 mm (0.2 inches)48%very high
October Weather18°C (65°F)11 mm (0.4 inches)59%high
November Weather14°C (58°F)25 mm (1.0 inches)72%moderate
December Weather10°C (50°F)79 mm (3.1 inches)76%moderate

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