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September Weather in Oakland, United States

Last updated: June 24, 2025

In September, the average temperature in Oakland, United States hovers around 21°C (69°F). Visitors can expect a range from a chilly 4°C (40°F) to a scorching 35°C (96°F). With 98 mm (3.9 in) of precipitation spread over 10 days, staying prepared for some rainy spells is wise. Additionally, the average humidity sits at a comfortable 75%, making for a pleasant experience.

September Temperature in Oakland

In September in Oakland, the average temperature is 21°C (69°F). The maximum can reach 35°C (96°F), while the minimum can drop to as low as 4°C (40°F). This range makes it a great time for travelers to enjoy a mix of warm days and cool evenings in Oakland.

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 (69°F), with highs reaching up to 35°C (96°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec242541506375777469533931
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 total precipitation amount is 98 mm (3.9 in) recorded over a span of 10 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 98 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3234935915612573103981373235
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 75%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace that can make even a short walk feel exhausting for travelers, often leading to a longing for refreshing breezes or air-conditioned retreats.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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-4°C (25°F)32 mm (1.3 inches)76%moderate
February Weather-4°C (25°F)34 mm (1.3 inches)80%moderate
March Weather5°C (41°F)93 mm (3.7 inches)73%high
April Weather10°C (50°F)59 mm (2.3 inches)74%very high
May Weather17°C (63°F)156 mm (6.2 inches)78%very high
June Weather24°C (75°F)125 mm (4.9 inches)82%very high
July Weather25°C (78°F)73 mm (2.9 inches)83%very high
August Weather23°C (74°F)103 mm (4.1 inches)80%very high
September Weather21°C (69°F)98 mm (3.9 inches)75%very high
October Weather11°C (53°F)137 mm (5.4 inches)75%high
November Weather4°C (40°F)32 mm (1.3 inches)82%moderate
December Weather-1°C (31°F)35 mm (1.4 inches)83%low

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