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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 23°C (74°F). Expect a range from a crisp 8°C (47°F) at night to a warm 35°C (96°F) during the day. However, be prepared for some rain, as 143 mm (5.6 in) of precipitation can fall over 11 days. With an average humidity of 79%, it's a good idea to stay hydrated and enjoy the lush surroundings!

September Temperature in Pleasant Hill

In September in Pleasant Hill, the average temperature is 23°C (74°F). The maximum can reach 35°C (96°F), and the minimum can drop as low as 8°C (47°F). This variety in temperatures makes Pleasant Hill a suitable destination for travelers seeking both warm days and 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 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec434853617076807874655146
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 total precipitation amount reaches 143 mm (5.6 in) over the course of 11 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 143 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec91113811001171061061271448480107
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 79%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities a bit less comfortable, urging travelers to seek shade and hydration throughout the day.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%81%80%81%81%81%80%79%80%86%86%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109853
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 Weather6°C (43°F)91 mm (3.6 inches)85%moderate
February Weather9°C (49°F)113 mm (4.4 inches)82%high
March Weather11°C (53°F)81 mm (3.2 inches)81%very high
April Weather16°C (62°F)100 mm (3.9 inches)80%very high
May Weather21°C (70°F)117 mm (4.6 inches)81%extreme
June Weather24°C (76°F)106 mm (4.2 inches)81%extreme
July Weather27°C (80°F)106 mm (4.2 inches)81%extreme
August Weather26°C (78°F)127 mm (5.0 inches)80%very high
September Weather23°C (74°F)143 mm (5.6 inches)79%very high
October Weather18°C (65°F)84 mm (3.3 inches)80%very high
November Weather10°C (51°F)80 mm (3.1 inches)85%moderate
December Weather8°C (47°F)107 mm (4.2 inches)86%moderate

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