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September Weather in San Joaquin, United States

Last updated: June 24, 2025

In San Joaquin, United States, the average temperature in September hovers around 26°C (80°F), offering a pleasantly warm climate. Expect temperatures to range from a cool 11°C (52°F) to a sweltering 43°C (110°F). Fortunately, rainfall is minimal, with just 1 mm (0.0 in) over 0 days, and the average humidity stays around 55%, ensuring comfort as you enjoy the season.

September Temperature in San Joaquin

In September in San Joaquin, the average temperature is 26°C (80°F). Maximums can reach 43°C (110°F) and minimums can be as low as 11°C (52°F). Travelers should be prepared for a wide range of temperatures and plan accordingly for both hot and cool conditions.

September Weather in San Joaquin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Joaquin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Joaquin, September typically has an average temperature of 26°C (80°F), with highs reaching up to 43°C (110°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec515458667282888679685850
Data source: Temperature data for San Joaquin 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 San Joaquin

In San Joaquin in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in San Joaquin

The chart displays monthly precipitation patterns in San Joaquin, 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 San Joaquin, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec6047652517201192249
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Joaquin

In San Joaquin in September, humidity is 55%. With an average temperature of 26°C (80°F), this humidity feels like a warm embrace, making traveling a bit sticky but still comfortable, as long as you stay hydrated and take breaks in the shade.

September Average Humidity in San Joaquin

This chart illustrates the average monthly humidity levels in San Joaquin, 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 San Joaquin is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Joaquin

In San Joaquin 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 San Joaquin.

Maximum UV Index Levels in San Joaquin for September

The chart shows the monthly maximum UV Index (UVI) for San Joaquin 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 San Joaquin typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119753
Data source: San Joaquin 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 San Joaquin Compares to Other Months

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

This table compares monthly weather conditions in San Joaquin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)60 mm (2.4 inches)82%moderate
February Weather12°C (54°F)47 mm (1.9 inches)84%moderate
March Weather14°C (58°F)65 mm (2.5 inches)82%very high
April Weather19°C (66°F)25 mm (1.0 inches)78%very high
May Weather22°C (73°F)17 mm (0.7 inches)71%extreme
June Weather28°C (82°F)2 mm (0.1 inches)64%extreme
July Weather31°C (88°F)0 mm (0.0 inches)58%extreme
August Weather30°C (86°F)1 mm (0.0 inches)54%extreme
September Weather26°C (80°F)1 mm (0.0 inches)55%very high
October Weather20°C (68°F)9 mm (0.4 inches)62%high
November Weather14°C (58°F)22 mm (0.9 inches)78%moderate
December Weather10°C (51°F)49 mm (1.9 inches)80%moderate

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