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September Weather in Oakland, United States

Last updated: June 24, 2025

In September, the average temperature in Oakland, United States is a pleasant 21°C (71°F), with a minimum dipping to 6°C (43°F) and a maximum soaring to 34°C (93°F). Expect approximately 77 mm (3.0 in) of precipitation over 7 days, accompanied by an average humidity of 79%. Be prepared for warm conditions with a chance of rain!

September Temperature in Oakland

In September in Oakland, the average temperature is 21°C (71°F). The maximum can reach 34°C (93°F), while the minimum can dip to as low as 6°C (43°F). This diverse range makes it essential for travelers to pack both light clothing for warm days and layers for cooler evenings.

September Weather in Oakland: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Oakland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oakland, September typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec293243536675777470584236
Data source: Temperature data for Oakland 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 Oakland

In Oakland in September, the precipitation amount is 77 mm (3.0 in) over the course of 7 days.

September Precipitation Trends in Oakland

The chart displays monthly precipitation patterns in Oakland, 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 Oakland, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec7980119111140103107110771198262
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oakland

In Oakland in September humidity is 79%. With an average temperature of 21°C (71°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel laborious and exhausting. Travelers should be prepared to hydrate frequently and take breaks in shaded areas to fully enjoy their time exploring.

September Average Humidity in Oakland

This chart illustrates the average monthly humidity levels in Oakland, 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 Oakland is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oakland

In Oakland 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 Oakland.

Maximum UV Index Levels in Oakland for September

The chart shows the monthly maximum UV Index (UVI) for Oakland 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 Oakland typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Oakland 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 Oakland Compares to Other Months

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

This table compares monthly weather conditions in Oakland, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)79 mm (3.1 inches)84%moderate
February Weather0°C (33°F)80 mm (3.2 inches)82%moderate
March Weather6°C (44°F)118 mm (4.7 inches)84%high
April Weather12°C (53°F)111 mm (4.4 inches)83%very high
May Weather19°C (66°F)140 mm (5.5 inches)80%very high
June Weather24°C (75°F)103 mm (4.1 inches)83%extreme
July Weather25°C (78°F)107 mm (4.2 inches)82%very high
August Weather24°C (75°F)110 mm (4.3 inches)82%very high
September Weather21°C (71°F)77 mm (3.0 inches)79%very high
October Weather14°C (58°F)119 mm (4.7 inches)79%high
November Weather5°C (42°F)82 mm (3.2 inches)88%moderate
December Weather2°C (36°F)62 mm (2.4 inches)87%moderate

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