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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 reaches a pleasant 26°C (79°F). You can expect temperatures to range from a cool 13°C (56°F) to a sweltering 38°C (101°F). With an average precipitation of 120 mm (4.7 in) over about 9 days, it’s a good idea to prepare for some wet weather. The average humidity sits at a comfortable 72%, creating a warm and inviting atmosphere for your stay!

September Temperature in Pleasant Hill

In September in Pleasant Hill, the average temperature is 26°C (79°F). Maximums can reach 38°C (101°F), while minimums can drop to as low as 13°C (56°F). This makes Pleasant Hill a great travel destination for those who enjoy warm weather with a cool reprieve during the night.

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 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec505362667581838379695754
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 120 mm (4.7 in) over the course of 9 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 120 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1041551251581791229814412010775137
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 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%81%79%80%81%76%73%72%72%73%83%88%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110864
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 Weather10°C (50°F)104 mm (4.1 inches)81%moderate
February Weather12°C (53°F)155 mm (6.1 inches)81%very high
March Weather17°C (62°F)125 mm (4.9 inches)79%very high
April Weather19°C (66°F)158 mm (6.2 inches)80%extreme
May Weather24°C (75°F)179 mm (7.1 inches)81%extreme
June Weather27°C (81°F)122 mm (4.8 inches)76%extreme
July Weather28°C (83°F)98 mm (3.9 inches)73%extreme
August Weather28°C (83°F)144 mm (5.7 inches)71%extreme
September Weather26°C (79°F)120 mm (4.7 inches)72%very high
October Weather21°C (69°F)107 mm (4.2 inches)73%very high
November Weather14°C (58°F)75 mm (3.0 inches)83%high
December Weather12°C (54°F)137 mm (5.4 inches)88%moderate

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