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September Weather in San Jose, Argentina

Last updated: August 22, 2025

In September, the average temperature in San Jose, Argentina hovers around 14°C (58°F). You can expect a minimum dip to -2°C (28°F) and a potential peak reaching 34°C (93°F). This month also sees an average precipitation of 28 mm (1.1 in) spread over 4 days, accompanied by an average humidity of 51%.

September Temperature in San Jose

In September in San Jose, the average temperature is 14°C (58°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures during their visit.

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 14°C (58°F), with highs reaching up to 34°C (93°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec716865615448485258636769
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 precipitation amount is 28 mm (1.1 in) over the course of 4 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 28 mm (1.1 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec1001338763341566284984117
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 51%. With an average temperature of 14°C (58°F), this humidity feels like a refreshing embrace, making it ideal for travelers who enjoy a mild climate without the discomfort of oppressive heat.

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 51%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%66%68%83%82%72%57%42%51%47%58%62%
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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec16141310756710131515
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 Weather22°C (71°F)100 mm (3.9 inches)63%extreme
February Weather20°C (68°F)133 mm (5.2 inches)66%extreme
March Weather18°C (65°F)87 mm (3.4 inches)68%extreme
April Weather16°C (61°F)63 mm (2.5 inches)83%very high
May Weather12°C (54°F)34 mm (1.3 inches)82%high
June Weather9°C (48°F)14 mm (0.6 inches)72%moderate
July Weather9°C (48°F)6 mm (0.3 inches)57%high
August Weather11°C (53°F)6 mm (0.2 inches)42%high
September Weather14°C (58°F)28 mm (1.1 inches)51%very high
October Weather17°C (63°F)49 mm (1.9 inches)47%extreme
November Weather19°C (67°F)84 mm (3.3 inches)58%extreme
December Weather21°C (69°F)117 mm (4.6 inches)61%extreme

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