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September Weather in San Borja, Bolivia

Last updated: August 22, 2025

In September, the average temperature in San Borja, Bolivia is a warm 28°C (82°F). While you can expect pleasant days, temperatures can fluctuate between a minimum of 14°C (58°F) and a sweltering maximum of 41°C (106°F). Be prepared for 79 mm (3.1 in) of rain over approximately 10 days, and enjoy the comfortable 43% humidity that helps balance the heat!

September Temperature in San Borja

In September in San Borja, the average temperature is 28°C (82°F), with maximums reaching 41°C (106°F) and minimums as low as 14°C (58°F). It's advisable to pack lightweight clothing for the daytime and layers for the cooler evenings while exploring this vibrant destination.

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

The chart illustrates September temperature patterns in San Borja, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Borja, September typically has an average temperature of 28°C (82°F), with highs reaching up to 41°C (106°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec818080797673737782838280
Data source: Temperature data for San Borja 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 Borja

In San Borja in September, the precipitation amount is 79 mm (3.1 in) over a span of 10 days.

September Precipitation Trends in San Borja

The chart displays monthly precipitation patterns in San Borja, 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 Borja, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec2792863251897959446379148229429
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Borja

In San Borja in September, humidity is 43%. With an average temperature of 28°C (82°F), this humidity feels like a warm embrace, making it pleasantly comfortable for traveling, though you might occasionally notice a slight stickiness in the air as you explore.

September Average Humidity in San Borja

This chart illustrates the average monthly humidity levels in San Borja, 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 Borja is approximately 43%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%87%88%86%83%69%50%43%43%45%71%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Borja

In San Borja 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 Borja.

Maximum UV Index Levels in San Borja for September

The chart shows the monthly maximum UV Index (UVI) for San Borja 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 Borja typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1515151411991013151516
Data source: San Borja 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 Borja Compares to Other Months

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

This table compares monthly weather conditions in San Borja, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (81°F)279 mm (11.0 inches)90%extreme
February Weather27°C (80°F)286 mm (11.3 inches)87%extreme
March Weather27°C (80°F)325 mm (12.8 inches)88%extreme
April Weather26°C (79°F)189 mm (7.5 inches)86%extreme
May Weather24°C (76°F)79 mm (3.1 inches)83%extreme
June Weather23°C (73°F)59 mm (2.3 inches)69%very high
July Weather23°C (74°F)44 mm (1.7 inches)50%very high
August Weather25°C (77°F)63 mm (2.5 inches)43%very high
September Weather28°C (82°F)79 mm (3.1 inches)43%extreme
October Weather29°C (84°F)148 mm (5.8 inches)45%extreme
November Weather28°C (82°F)229 mm (9.0 inches)71%extreme
December Weather27°C (80°F)428 mm (16.9 inches)88%extreme

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