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September Weather in Stockton, United States

Last updated: June 24, 2025

In September, the average temperature in Stockton, United States hovers around 22°C (72°F). Expect a range from a cool 4°C (40°F) to a sweltering 37°C (100°F). The region sees a typical precipitation of 59 mm (2.3 in) over 5 days, coupled with an average humidity of 73%, ensuring a moist and dynamic climate. Enjoy the varied weather!

September Temperature in Stockton

In September in Stockton, the average temperature is 22°C (72°F). Maximum temperatures can reach up to 37°C (100°F), while minimums can drop as low as 4°C (40°F). This varied climate makes it an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Stockton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stockton, September typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (100°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec303044536377817771544335
Data source: Temperature data for Stockton 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 Stockton

In Stockton in September, the precipitation amount is 59 mm (2.3 in) over the course of 5 days.

September Precipitation Trends in Stockton

The chart displays monthly precipitation patterns in Stockton, 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 Stockton, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2420673815860748759581832
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stockton

In Stockton in September, humidity is 73%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, so it's best to stay hydrated and take frequent breaks while exploring.

September Average Humidity in Stockton

This chart illustrates the average monthly humidity levels in Stockton, 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 Stockton is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stockton

In Stockton 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 Stockton.

Maximum UV Index Levels in Stockton for September

The chart shows the monthly maximum UV Index (UVI) for Stockton 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 Stockton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Stockton 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 Stockton Compares to Other Months

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

This table compares monthly weather conditions in Stockton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)24 mm (0.9 inches)74%moderate
February Weather-1°C (31°F)20 mm (0.8 inches)78%moderate
March Weather7°C (44°F)67 mm (2.7 inches)67%high
April Weather11°C (53°F)38 mm (1.5 inches)70%very high
May Weather17°C (64°F)158 mm (6.2 inches)82%very high
June Weather25°C (77°F)60 mm (2.4 inches)81%extreme
July Weather27°C (81°F)74 mm (2.9 inches)80%extreme
August Weather25°C (77°F)87 mm (3.4 inches)80%very high
September Weather22°C (72°F)59 mm (2.3 inches)73%very high
October Weather12°C (55°F)58 mm (2.3 inches)71%high
November Weather6°C (44°F)18 mm (0.7 inches)79%moderate
December Weather2°C (35°F)32 mm (1.3 inches)83%moderate

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