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September Weather in San Justo, Argentina

Last updated: August 22, 2025

In September, the average temperature in San Justo, Argentina hovers around 17°C (63°F). Expect varying conditions, with minimums dipping to 2°C (35°F) and maximums soaring up to 36°C (98°F). Precipitation is quite noticeable, with an average of 59 mm (2.3 in) spread over 6 days, while the humidity remains comfortable at around 59%.

September Temperature in San Justo

In September in San Justo, the average temperature is 17°C (63°F). Maximum temperatures can reach 36°C (98°F), while the minimum can drop to as low as 2°C (35°F). Travelers should be prepared for a wide range of temperatures, making layered clothing essential.

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

The chart illustrates September temperature patterns in San Justo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Justo, September typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (98°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec797672686055545762677376
Data source: Temperature data for San Justo 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 Justo

In San Justo in September, the precipitation amount is 59 mm (2.3 in) over the course of 6 days.

September Precipitation Trends in San Justo

The chart displays monthly precipitation patterns in San Justo, 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 Justo, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec13012310597117604462591118682
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Justo

In San Justo in September, humidity is 59%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you're prepared for occasional mugginess.

September Average Humidity in San Justo

This chart illustrates the average monthly humidity levels in San Justo, 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 Justo is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%57%65%76%83%78%58%54%59%50%53%57%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Justo

In San Justo 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 Justo.

Maximum UV Index Levels in San Justo for September

The chart shows the monthly maximum UV Index (UVI) for San Justo 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 Justo typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141312964569111414
Data source: San Justo 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 Justo Compares to Other Months

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

This table compares monthly weather conditions in San Justo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)130 mm (5.1 inches)51%extreme
February Weather24°C (76°F)123 mm (4.8 inches)57%extreme
March Weather22°C (72°F)105 mm (4.1 inches)65%extreme
April Weather20°C (68°F)97 mm (3.8 inches)76%very high
May Weather16°C (60°F)117 mm (4.6 inches)83%high
June Weather13°C (55°F)60 mm (2.4 inches)78%moderate
July Weather12°C (54°F)44 mm (1.7 inches)58%moderate
August Weather14°C (57°F)62 mm (2.5 inches)54%high
September Weather17°C (63°F)59 mm (2.3 inches)59%very high
October Weather20°C (67°F)111 mm (4.4 inches)50%extreme
November Weather23°C (73°F)86 mm (3.4 inches)53%extreme
December Weather25°C (77°F)82 mm (3.2 inches)57%extreme

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