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September Weather in San Bernardo, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Bernardo, Mexico is a pleasant 20°C (68°F). However, temperatures can vary significantly, with a minimum of 9°C (49°F) and a maximum reaching 32°C (90°F). Visitors should prepare for some precipitation, as the area typically receives 119 mm (4.7 in) of rain over 15 days. Additionally, the average humidity is quite high at 88%, creating a uniquely damp atmosphere.

September Temperature in San Bernardo

In September in San Bernardo, the average temperature is 20°C (68°F). Maximums can reach 32°C (90°F) and minimums can be as low as 9°C (49°F). This makes it a pleasant time for travelers seeking mild weather for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in San Bernardo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Bernardo, September typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec515561677277727267645851
Data source: Temperature data for San Bernardo 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 Bernardo

In San Bernardo in September, the precipitation amount is 119 mm (4.7 in) over a span of 15 days.

September Precipitation Trends in San Bernardo

The chart displays monthly precipitation patterns in San Bernardo, 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 Bernardo, September typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec374393311066119431212
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Bernardo

In San Bernardo in September humidity is 88%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making every step feel heavier and every breath a bit more labored, which can be quite draining for traveling.

September Average Humidity in San Bernardo

This chart illustrates the average monthly humidity levels in San Bernardo, 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 Bernardo is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%69%57%49%49%64%82%87%88%83%84%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Bernardo

In San Bernardo in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Bernardo.

Maximum UV Index Levels in San Bernardo for September

The chart shows the monthly maximum UV Index (UVI) for San Bernardo 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 Bernardo typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec711121414141413131187
Data source: San Bernardo 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 Bernardo Compares to Other Months

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

This table compares monthly weather conditions in San Bernardo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)3 mm (0.1 inches)76%high
February Weather13°C (55°F)7 mm (0.3 inches)69%extreme
March Weather16°C (61°F)4 mm (0.2 inches)57%extreme
April Weather19°C (67°F)3 mm (0.1 inches)49%extreme
May Weather22°C (72°F)9 mm (0.3 inches)49%extreme
June Weather25°C (77°F)33 mm (1.3 inches)64%extreme
July Weather22°C (72°F)110 mm (4.3 inches)82%extreme
August Weather22°C (73°F)66 mm (2.6 inches)87%extreme
September Weather20°C (68°F)119 mm (4.7 inches)88%extreme
October Weather18°C (64°F)42 mm (1.7 inches)83%extreme
November Weather15°C (59°F)12 mm (0.5 inches)84%very high
December Weather11°C (52°F)12 mm (0.5 inches)86%high

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