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September Weather in Pleasant Hill, United States

Last updated: June 24, 2025

In September, the average temperature in Pleasant Hill, United States hovers around 21°C (70°F), offering a pleasant climate for outdoor activities. However, temperatures can vary significantly, with lows of 5°C (41°F) and highs of 35°C (95°F). Expect 63 mm (2.5 in) of rainfall spread over about 7 days, contributing to an average humidity level of 80%, creating a tropical feel throughout the month.

September Temperature in Pleasant Hill

In September in Pleasant Hill, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F), while minimums can drop to 5°C (41°F). This variability in temperature makes it essential for travelers to pack both lightweight clothing for the warm days and warmer layers for the cooler evenings.

September Weather in Pleasant Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Pleasant Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pleasant Hill, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec273042516474777470564035
Data source: Temperature data for Pleasant Hill 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 Pleasant Hill

In Pleasant Hill in September, the precipitation amount is 63 mm (2.5 in) over a span of 7 days.

September Precipitation Trends in Pleasant Hill

The chart displays monthly precipitation patterns in Pleasant Hill, 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 Pleasant Hill, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec65701141161551139699631246354
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pleasant Hill

In Pleasant Hill in September humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

September Average Humidity in Pleasant Hill

This chart illustrates the average monthly humidity levels in Pleasant Hill, 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 Pleasant Hill is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pleasant Hill

In Pleasant Hill 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 Pleasant Hill.

Maximum UV Index Levels in Pleasant Hill for September

The chart shows the monthly maximum UV Index (UVI) for Pleasant Hill 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 Pleasant Hill typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec366910111098642
Data source: Pleasant Hill 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 Pleasant Hill Compares to Other Months

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

This table compares monthly weather conditions in Pleasant Hill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)65 mm (2.6 inches)82%moderate
February Weather-1°C (30°F)70 mm (2.8 inches)83%high
March Weather5°C (42°F)113 mm (4.5 inches)84%high
April Weather11°C (51°F)116 mm (4.6 inches)85%very high
May Weather18°C (64°F)155 mm (6.1 inches)79%very high
June Weather23°C (74°F)112 mm (4.4 inches)82%extreme
July Weather25°C (77°F)95 mm (3.8 inches)80%very high
August Weather23°C (74°F)99 mm (3.9 inches)81%very high
September Weather21°C (70°F)63 mm (2.5 inches)80%very high
October Weather13°C (57°F)123 mm (4.9 inches)82%high
November Weather5°C (41°F)63 mm (2.5 inches)88%moderate
December Weather1°C (35°F)54 mm (2.1 inches)84%low

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