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September Weather in San Bartolo, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Bartolo, Mexico hovers around 24°C (76°F), making it a pleasant time to visit. However, temperatures can range from a cool 16°C (61°F) to a scorching 37°C (99°F). Expect some rain with 90 mm (3.6 in) of precipitation spread over 17 days, contributing to an average humidity level of 81%. Perfect for those who enjoy a warm, tropical atmosphere!

September Temperature in San Bartolo

In September in San Bartolo, the average temperature is 24°C (76°F). Maximum temperatures can reach 37°C (99°F), while minimum temperatures can be as low as 16°C (61°F). This makes it an ideal time for travelers to enjoy a warm climate with comfortable evenings.

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

The chart illustrates September temperature patterns in San Bartolo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Bartolo, September typically has an average temperature of 24°C (76°F), with highs reaching up to 37°C (99°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec616570757978777775726662
Data source: Temperature data for San Bartolo 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 Bartolo

In San Bartolo in September, the precipitation amount is 90 mm (3.6 in) over a duration of 17 days.

September Precipitation Trends in San Bartolo

The chart displays monthly precipitation patterns in San Bartolo, 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 Bartolo, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec232029225275725390942918
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Bartolo

In San Bartolo in September, humidity is 81%. With an average temperature of 24°C (76°F), this humidity feels like a warm, muggy embrace that can make outdoor activities feel exhausting, leaving travelers in need of frequent breaks and plenty of hydration.

September Average Humidity in San Bartolo

This chart illustrates the average monthly humidity levels in San Bartolo, 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 Bartolo is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%69%65%64%75%78%67%64%82%86%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Bartolo

In San Bartolo 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 Bartolo.

Maximum UV Index Levels in San Bartolo for September

The chart shows the monthly maximum UV Index (UVI) for San Bartolo 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 Bartolo typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810131314131413131297
Data source: San Bartolo 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 Bartolo Compares to Other Months

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

This table compares monthly weather conditions in San Bartolo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)23 mm (0.9 inches)75%very high
February Weather18°C (65°F)20 mm (0.8 inches)69%very high
March Weather21°C (70°F)29 mm (1.1 inches)65%extreme
April Weather24°C (75°F)22 mm (0.9 inches)64%extreme
May Weather26°C (79°F)52 mm (2.1 inches)75%extreme
June Weather26°C (78°F)75 mm (3.0 inches)78%extreme
July Weather25°C (78°F)72 mm (2.8 inches)67%extreme
August Weather25°C (78°F)53 mm (2.1 inches)64%extreme
September Weather24°C (76°F)90 mm (3.6 inches)81%extreme
October Weather22°C (72°F)94 mm (3.7 inches)85%extreme
November Weather19°C (66°F)29 mm (1.1 inches)87%very high
December Weather17°C (62°F)18 mm (0.7 inches)87%high

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