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September Weather in Monterey Park, United States

Last updated: June 24, 2025

In Monterey Park, United States, the average temperature in September hovers around 22°C (73°F). The temperature can vary significantly, with a minimum of 5°C (42°F) and a maximum soaring to 35°C (96°F). During this month, expect about 23 mm (0.9 in) of precipitation spread over 3 days, and enjoy a comfortable average humidity of 72%.

September Temperature in Monterey Park

In September in Monterey Park, the average temperature is 22°C (73°F). The maximum can reach 35°C (96°F), and the minimum can be as low as 5°C (42°F). Pack accordingly to enjoy the diverse weather conditions while exploring!

September Weather in Monterey Park: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Monterey Park, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monterey Park, September typically has an average temperature of 22°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec374251596978807972594838
Data source: Temperature data for Monterey Park 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 Monterey Park

In Monterey Park in September, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

September Precipitation Trends in Monterey Park

The chart displays monthly precipitation patterns in Monterey Park, 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 Monterey Park, September typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec15171214713231424231411
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Monterey Park

In Monterey Park in September, humidity is 72%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls but potentially uncomfortable for prolonged outdoor activities.

September Average Humidity in Monterey Park

This chart illustrates the average monthly humidity levels in Monterey Park, 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 Monterey Park is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%66%60%57%55%57%65%72%78%81%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Monterey Park

In Monterey Park 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 Monterey Park.

Maximum UV Index Levels in Monterey Park for September

The chart shows the monthly maximum UV Index (UVI) for Monterey Park 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 Monterey Park typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121211864
Data source: Monterey Park 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 Monterey Park Compares to Other Months

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

This table compares monthly weather conditions in Monterey Park, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)15 mm (0.6 inches)78%moderate
February Weather5°C (42°F)17 mm (0.7 inches)79%high
March Weather11°C (51°F)12 mm (0.5 inches)66%very high
April Weather15°C (60°F)14 mm (0.5 inches)60%extreme
May Weather20°C (69°F)7 mm (0.3 inches)57%extreme
June Weather26°C (78°F)13 mm (0.5 inches)55%extreme
July Weather27°C (80°F)23 mm (0.9 inches)56%extreme
August Weather26°C (79°F)14 mm (0.6 inches)65%extreme
September Weather22°C (73°F)23 mm (0.9 inches)72%extreme
October Weather15°C (59°F)23 mm (0.9 inches)78%very high
November Weather9°C (48°F)14 mm (0.5 inches)81%high
December Weather3°C (38°F)11 mm (0.4 inches)79%moderate

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