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September Weather in San Justo, Argentina

Last updated: August 22, 2025

In September, the average temperature in San Justo, Argentina is a pleasant 16°C (61°F). However, temperatures can vary significantly, with lows dipping to 1°C (33°F) and highs reaching a warm 32°C (90°F). Expect about 90 mm (3.5 in) of precipitation over 7 days, and be prepared for an average humidity of 70%.

September Temperature in San Justo

In September in San Justo, the average temperature is 16°C (61°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as 1°C (33°F). It's a great time to visit for those who enjoy mild temperatures during the day and cooler evenings.

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 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec777571675954535660657275
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 90 mm (3.5 in) over the course of 7 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 90 mm (3.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1251049594977259819011272128
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 70%. With an average temperature of 16°C (61°F), this humidity feels like a warm, damp blanket wrapping around you, making travel somewhat uncomfortable as you navigate the sticky air while trying to enjoy your surroundings.

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 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec54%61%69%79%85%82%69%65%70%63%61%63%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151311854468111314
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 Weather25°C (78°F)125 mm (4.9 inches)54%extreme
February Weather24°C (75°F)103 mm (4.1 inches)61%extreme
March Weather22°C (71°F)95 mm (3.7 inches)69%extreme
April Weather19°C (67°F)94 mm (3.7 inches)79%very high
May Weather15°C (59°F)97 mm (3.8 inches)85%moderate
June Weather12°C (55°F)72 mm (2.9 inches)82%moderate
July Weather11°C (53°F)59 mm (2.3 inches)69%moderate
August Weather13°C (56°F)81 mm (3.2 inches)65%high
September Weather16°C (61°F)90 mm (3.5 inches)70%very high
October Weather18°C (65°F)112 mm (4.4 inches)63%extreme
November Weather22°C (72°F)71 mm (2.8 inches)60%extreme
December Weather24°C (75°F)128 mm (5.0 inches)63%extreme

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