nomadseason

September Weather in Oakland, United States

Last updated: June 24, 2025

In September, the average temperature in Oakland, United States is a comfortable 18°C (64°F), with lows dipping to 2°C (37°F) and highs reaching up to 29°C (85°F). Expect about 120 mm (4.7 in) of precipitation spread over 11 days, accompanied by a pleasant average humidity of 68%. Whether you're exploring the outdoors or enjoying local culture, this month offers a delightful climate for every activity!

September Temperature in Oakland

In September in Oakland, the average temperature is 18°C (64°F). Maximums can reach 29°C (85°F), while minimums can drop as low as 2°C (37°F). This variation makes it essential for travelers to pack for both warm days and cooler nights.

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 18°C (64°F), with highs reaching up to 29°C (85°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec293439495966716964544034
Data source: Temperature data for Oakland generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 120 mm (4.7 in) during a span of 11 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 120 mm (4.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9815312415617115211611412011892131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Oakland

In Oakland in September, humidity is 68%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making for a slightly muggy experience that can leave you feeling sticky as you explore, so it’s best to stay hydrated and take frequent breaks in the shade.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
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-2°C (29°F)98 mm (3.8 inches)86%moderate
February Weather1°C (34°F)153 mm (6.0 inches)86%moderate
March Weather4°C (39°F)124 mm (4.9 inches)86%high
April Weather9°C (49°F)156 mm (6.1 inches)84%very high
May Weather15°C (59°F)171 mm (6.7 inches)78%very high
June Weather19°C (66°F)152 mm (6.0 inches)79%very high
July Weather21°C (71°F)116 mm (4.6 inches)70%very high
August Weather20°C (69°F)114 mm (4.5 inches)59%very high
September Weather18°C (64°F)120 mm (4.7 inches)68%very high
October Weather12°C (54°F)118 mm (4.7 inches)80%high
November Weather4°C (40°F)92 mm (3.6 inches)86%moderate
December Weather1°C (34°F)131 mm (5.2 inches)85%moderate

Compare Oakland's Climate with Cities Worldwide