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September Weather in San Bartolo, Guatemala

Last updated: August 23, 2025

In September, the average temperature in San Bartolo, Guatemala hovers around 16°C (60°F), with a pleasant range from a minimum of 9°C (48°F) to a maximum of 23°C (74°F). Be prepared for a fair amount of rain, as precipitation reaches 330 mm (13.0 in) spread across 29 days. With an average humidity of 82%, it's prudent to pack an umbrella and a light jacket for those cooler, damp days!

September Temperature in San Bartolo

In September in San Bartolo, the average temperature is 16°C (60°F). Maximums can reach 23°C (74°F) and minimums can be as low as 9°C (48°F). It's a great time for travelers to enjoy mild weather while exploring the local attractions.

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 16°C (60°F), with highs reaching up to 23°C (74°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec565860626261606060605857
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 total precipitation amount is 330 mm (13.0 in) spread over 29 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 330 mm (13.0 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec241933912913731732643302627629
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 82%. With an average temperature of 16°C (60°F), this humidity feels like walking through a warm, thick blanket that clings to your skin, making every step feel heavier and travel more exhausting.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%68%59%57%65%66%75%82%82%83%80%76%
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 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 Bartolo, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121416161515161514141110
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 Weather13°C (56°F)24 mm (1.0 inches)76%extreme
February Weather14°C (58°F)18 mm (0.7 inches)68%extreme
March Weather15°C (60°F)33 mm (1.3 inches)59%extreme
April Weather16°C (62°F)91 mm (3.6 inches)57%extreme
May Weather17°C (62°F)290 mm (11.4 inches)65%extreme
June Weather16°C (61°F)373 mm (14.7 inches)66%extreme
July Weather16°C (60°F)173 mm (6.8 inches)75%extreme
August Weather16°C (60°F)264 mm (10.4 inches)82%extreme
September Weather16°C (60°F)330 mm (13.0 inches)82%extreme
October Weather16°C (60°F)262 mm (10.3 inches)83%extreme
November Weather15°C (59°F)75 mm (3.0 inches)80%extreme
December Weather14°C (57°F)29 mm (1.2 inches)76%very high

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