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September Weather in San Jose, Mexico

Last updated: August 27, 2025

In San Jose, Mexico, the average temperature in September hovers around 15°C (60°F). Expect a minimum of 8°C (47°F) and a pleasant maximum of 26°C (79°F). During this time, precipitation averages 362 mm (14.2 in) over 28 days, accompanied by a high average humidity of 82%.

September Temperature in San Jose

In September, San Jose has an average temperature of 15°C (60°F), with maximums reaching 26°C (79°F) and minimums dropping to as low as 8°C (47°F). This comfortable climate makes it an ideal time for outdoor adventures and sightseeing.

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

The chart illustrates September temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, September typically has an average temperature of 15°C (60°F), with highs reaching up to 26°C (79°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec535659626361606060595654
Data source: Temperature data for San Jose 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 Jose

In San Jose in September, the total precipitation amount is 362 mm (14.2 in) recorded over a span of 28 days.

September Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 Jose, September typically receives around 362 mm (14.2 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec151737552004223254013622156014
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Jose

In San Jose in September humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

September Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 Jose is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Jose

In San Jose in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for September

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 Jose typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121515151414141512109
Data source: San Jose 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 Jose Compares to Other Months

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

This table compares monthly weather conditions in San Jose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)15 mm (0.6 inches)84%very high
February Weather13°C (56°F)17 mm (0.7 inches)78%extreme
March Weather15°C (60°F)37 mm (1.5 inches)75%extreme
April Weather16°C (62°F)55 mm (2.2 inches)70%extreme
May Weather17°C (63°F)200 mm (7.9 inches)77%extreme
June Weather16°C (61°F)422 mm (16.6 inches)76%extreme
July Weather16°C (60°F)324 mm (12.8 inches)68%extreme
August Weather16°C (60°F)401 mm (15.8 inches)70%extreme
September Weather15°C (60°F)362 mm (14.2 inches)82%extreme
October Weather15°C (59°F)215 mm (8.5 inches)91%extreme
November Weather14°C (57°F)60 mm (2.4 inches)89%very high
December Weather12°C (54°F)14 mm (0.5 inches)88%very high

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