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September Weather in Stockton, United States

Last updated: June 24, 2025

In September, the average temperature in Stockton, United States is a pleasant 23°C (73°F). Expect a minimum of 8°C (46°F) and a maximum reaching up to 35°C (95°F). During this month, you'll experience about 75 mm (3.0 in) of precipitation spread over 7 days, coupled with an average humidity of 64%, creating a comfortable yet sometimes damp atmosphere.

September Temperature in Stockton

In September in Stockton, the average temperature is 23°C (73°F), with maximums reaching 35°C (95°F) and minimums dropping to 8°C (46°F). This range makes Stockton an ideal destination for travelers seeking pleasant weather and a variety of outdoor activities.

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 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec353749566777807773594641
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 75 mm (3.0 in) over a span of 7 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 75 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec696513312818086108144751195742
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 64%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel quite comfortable yet slightly sticky, urging travelers to enjoy leisurely activities early in the day or seek shade during peak hours.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather1°C (35°F)69 mm (2.7 inches)81%moderate
February Weather3°C (37°F)65 mm (2.5 inches)78%high
March Weather9°C (49°F)133 mm (5.2 inches)76%high
April Weather13°C (56°F)128 mm (5.0 inches)78%very high
May Weather19°C (67°F)180 mm (7.1 inches)83%very high
June Weather25°C (77°F)86 mm (3.4 inches)83%extreme
July Weather27°C (80°F)108 mm (4.2 inches)78%extreme
August Weather25°C (77°F)144 mm (5.7 inches)68%very high
September Weather23°C (73°F)75 mm (3.0 inches)64%very high
October Weather15°C (59°F)119 mm (4.7 inches)70%high
November Weather8°C (47°F)57 mm (2.2 inches)83%moderate
December Weather5°C (41°F)42 mm (1.6 inches)87%moderate

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