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September Weather in South Pasadena, United States

Last updated: June 24, 2025

In South Pasadena, United States, the average temperature in September is a warm 27°C (82°F). Expect a comfortable minimum of 23°C (74°F) and a pleasant high of 32°C (89°F). Be prepared for average humidity at 78% and precipitation totaling 143 mm (5.6 in) over 18 days.

September Temperature in South Pasadena

In September in South Pasadena, the average temperature is 27°C (82°F). Maximums can reach 32°C (89°F) and minimums can be as low as 23°C (74°F). This pleasant climate makes it an ideal time for travelers to enjoy outdoor activities and explore the local attractions.

September Weather in South Pasadena: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Pasadena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Pasadena, September typically has an average temperature of 27°C (82°F), with highs reaching up to 32°C (89°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec626568737781828281787065
Data source: Temperature data for South Pasadena 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 South Pasadena

In South Pasadena in September, the total precipitation amount is 143 mm (5.6 in) recorded over a span of 18 days.

September Precipitation Trends in South Pasadena

The chart displays monthly precipitation patterns in South Pasadena, 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 South Pasadena, September typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec40502060105174204219143674666
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Pasadena

In South Pasadena in September humidity is 78%. With an average temperature of 27°C (82°F), this humidity feels like a warm blanket enveloping you, making outdoor activities a sweaty affair and requiring frequent breaks for hydration.

September Average Humidity in South Pasadena

This chart illustrates the average monthly humidity levels in South Pasadena, 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 South Pasadena is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%82%79%78%76%75%74%75%78%80%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Pasadena

In South Pasadena in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in South Pasadena.

Maximum UV Index Levels in South Pasadena for September

The chart shows the monthly maximum UV Index (UVI) for South Pasadena 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 South Pasadena typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111112121111975
Data source: South Pasadena 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 South Pasadena Compares to Other Months

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

This table compares monthly weather conditions in South Pasadena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)40 mm (1.6 inches)82%high
February Weather19°C (66°F)50 mm (2.0 inches)82%very high
March Weather20°C (68°F)20 mm (0.8 inches)79%very high
April Weather23°C (73°F)60 mm (2.4 inches)78%extreme
May Weather25°C (77°F)105 mm (4.1 inches)76%extreme
June Weather27°C (81°F)174 mm (6.8 inches)75%extreme
July Weather28°C (82°F)204 mm (8.0 inches)74%extreme
August Weather28°C (83°F)219 mm (8.6 inches)74%extreme
September Weather27°C (82°F)143 mm (5.6 inches)78%extreme
October Weather26°C (79°F)67 mm (2.6 inches)79%very high
November Weather21°C (70°F)46 mm (1.8 inches)82%high
December Weather19°C (66°F)66 mm (2.6 inches)84%moderate

Compare South Pasadena's Climate with Cities Worldwide