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September Weather in San Juan Copala, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Juan Copala, Mexico is a pleasant 18°C (64°F), with a minimum of 11°C (52°F) and a maximum reaching 27°C (82°F). Expect an average humidity of 82%, along with a significant precipitation amount of 478 mm (18.8 in) spread over 29 days. Be prepared for a mix of weather as you enjoy your time in this vibrant locale!

September Temperature in San Juan Copala

In September in San Juan Copala, the average temperature is 18°C (64°F). Maximums can reach 27°C (82°F) and minimums can drop to as low as 11°C (52°F). This mild climate makes San Juan Copala an ideal destination for travelers looking to enjoy pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in San Juan Copala, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan Copala, September typically has an average temperature of 18°C (64°F), with highs reaching up to 27°C (82°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec596163646564636364636160
Data source: Temperature data for San Juan Copala 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 Juan Copala

In San Juan Copala in September, the precipitation amount is 478 mm (18.8 in) spread over 29 days.

September Precipitation Trends in San Juan Copala

The chart displays monthly precipitation patterns in San Juan Copala, 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 Juan Copala, September typically receives around 478 mm (18.8 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec15324571843873594394782414318
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Juan Copala

In San Juan Copala in September humidity is 82%. With an average temperature of 18°C (64°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel stifling, leaving travelers drenched in sweat and longing for respite in the shade.

September Average Humidity in San Juan Copala

This chart illustrates the average monthly humidity levels in San Juan Copala, 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 Juan Copala is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%61%59%62%73%78%79%82%82%79%72%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Juan Copala

In San Juan Copala in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Juan Copala, you can check here.

Maximum UV Index Levels in San Juan Copala for September

The chart shows the monthly maximum UV Index (UVI) for San Juan Copala 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 Juan Copala typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10131415151414141412109
Data source: San Juan Copala 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 Juan Copala Compares to Other Months

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

This table compares monthly weather conditions in San Juan Copala, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)15 mm (0.6 inches)65%very high
February Weather16°C (61°F)3 mm (0.1 inches)61%extreme
March Weather17°C (63°F)24 mm (0.9 inches)59%extreme
April Weather18°C (64°F)57 mm (2.3 inches)62%extreme
May Weather18°C (65°F)184 mm (7.2 inches)73%extreme
June Weather18°C (64°F)387 mm (15.2 inches)78%extreme
July Weather17°C (64°F)359 mm (14.1 inches)79%extreme
August Weather17°C (64°F)439 mm (17.3 inches)82%extreme
September Weather18°C (64°F)478 mm (18.8 inches)82%extreme
October Weather17°C (63°F)241 mm (9.5 inches)79%extreme
November Weather16°C (62°F)43 mm (1.7 inches)72%very high
December Weather15°C (60°F)18 mm (0.7 inches)70%very high

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