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September Weather in Oakley, United States

Last updated: June 24, 2025

In September, the average temperature in Oakley, United States hovers around 16°C (61°F). While you may experience a chilly minimum of -2°C (29°F), the mercury can soar as high as 36°C (97°F). This month brings approximately 25 mm (1.0 in) of precipitation spread over 4 days, all under an average humidity of 46%.

September Temperature in Oakley

In September in Oakley, the average temperature is 16°C (61°F). Maximums can reach 36°C (97°F), while minimums can plummet to -2°C (29°F). Be prepared for a wide range of temperatures to ensure a comfortable trip.

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

The chart illustrates September temperature patterns in Oakley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oakley, September typically has an average temperature of 16°C (61°F), with highs reaching up to 36°C (97°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634435263737161453625
Data source: Temperature data for Oakley 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 Oakley

In Oakley in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Oakley

The chart displays monthly precipitation patterns in Oakley, 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 Oakley, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec505950557435182925394149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oakley

In Oakley in September, humidity is 46%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing, mildly cool environment for traveling, where the air is crisp enough to keep you comfortable while exploring the sights without feeling stifling or oppressive.

September Average Humidity in Oakley

This chart illustrates the average monthly humidity levels in Oakley, 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 Oakley is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oakley

In Oakley 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 Oakley.

Maximum UV Index Levels in Oakley for September

The chart shows the monthly maximum UV Index (UVI) for Oakley 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 Oakley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Oakley 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 Oakley Compares to Other Months

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

This table compares monthly weather conditions in Oakley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)50 mm (2.0 inches)91%moderate
February Weather-3°C (27°F)59 mm (2.3 inches)92%moderate
March Weather1°C (35°F)50 mm (2.0 inches)85%high
April Weather6°C (43°F)55 mm (2.2 inches)76%very high
May Weather11°C (52°F)74 mm (2.9 inches)66%very high
June Weather17°C (63°F)35 mm (1.4 inches)62%extreme
July Weather23°C (73°F)18 mm (0.7 inches)53%extreme
August Weather21°C (71°F)29 mm (1.1 inches)42%very high
September Weather16°C (61°F)25 mm (1.0 inches)46%very high
October Weather7°C (45°F)39 mm (1.5 inches)64%high
November Weather2°C (36°F)41 mm (1.6 inches)83%moderate
December Weather-4°C (25°F)48 mm (1.9 inches)87%moderate

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