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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 comfortable 18°C (64°F). However, temperatures can swing from a cool 2°C (37°F) to a warm 33°C (91°F). You can expect 115 mm (4.5 in) of rainfall over about 9 days, while the average humidity hovers around 74%, creating a distinctly dynamic climate.

September Temperature in Stockton

In September in Stockton, the average temperature is 18°C (64°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (37°F). This range makes it a perfect time for travelers to enjoy a variety of outdoor activities, from warm days to cooler evenings.

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 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec181934445970737064493425
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 115 mm (4.5 in) over the course of 9 days, indicating a relatively wet period for the region.

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 115 mm (4.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec364957861531571061291151215343
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 74%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls but potentially uncomfortable for extended outdoor activities.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101098532
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-8°C (18°F)36 mm (1.4 inches)84%low
February Weather-7°C (20°F)49 mm (1.9 inches)85%moderate
March Weather1°C (35°F)57 mm (2.2 inches)84%moderate
April Weather7°C (44°F)86 mm (3.4 inches)83%very high
May Weather15°C (59°F)153 mm (6.0 inches)75%very high
June Weather21°C (71°F)157 mm (6.2 inches)79%very high
July Weather23°C (74°F)106 mm (4.2 inches)75%very high
August Weather21°C (70°F)129 mm (5.1 inches)69%very high
September Weather18°C (64°F)115 mm (4.5 inches)74%very high
October Weather9°C (49°F)121 mm (4.8 inches)79%moderate
November Weather1°C (34°F)53 mm (2.1 inches)88%moderate
December Weather-4°C (26°F)43 mm (1.7 inches)82%low

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