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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 21°C (70°F). However, be prepared for some variation, as temperatures can drop to a chilly 3°C (37°F) or soar to a sweltering 38°C (100°F). With 58 mm (2.3 in) of precipitation spread over approximately 5 days, the air remains quite humid, averaging around 82%. Whether you prefer warm days or cooler evenings, this month offers a compelling mix!

September Temperature in Oakley

In September in Oakley, the average temperature is 21°C (70°F). Maximums can reach 38°C (100°F), and minimums can be as low as 3°C (37°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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 21°C (70°F), with highs reaching up to 38°C (100°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec313143516175787570534335
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 58 mm (2.3 in) over the course of 5 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 58 mm (2.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec1816583512758625758581420
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 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%78%66%66%83%83%83%86%82%75%77%82%
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.
JanFebMarAprMayJunJulAugSepOctNovDec4579101211109643
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-1°C (31°F)18 mm (0.7 inches)74%moderate
February Weather-1°C (31°F)15 mm (0.6 inches)78%moderate
March Weather6°C (44°F)58 mm (2.3 inches)66%high
April Weather11°C (51°F)35 mm (1.4 inches)66%very high
May Weather16°C (61°F)127 mm (5.0 inches)83%very high
June Weather24°C (75°F)58 mm (2.3 inches)83%extreme
July Weather26°C (79°F)62 mm (2.4 inches)83%extreme
August Weather24°C (75°F)57 mm (2.2 inches)86%very high
September Weather21°C (70°F)58 mm (2.3 inches)82%very high
October Weather12°C (53°F)58 mm (2.3 inches)75%high
November Weather6°C (44°F)14 mm (0.6 inches)77%moderate
December Weather2°C (35°F)20 mm (0.8 inches)82%moderate

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