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September Weather in San Bernardino, Peru

Last updated: August 27, 2025

In September, the average temperature in San Bernardino, Peru hovers around 16°C (62°F), with possibilities ranging from a chilly 8°C (47°F) to a warm 26°C (78°F). Expect a fair share of rain, as 184 mm (7.3 in) of precipitation typically falls over 17 days. Along with this, the average humidity sits at a comfortable 42%, making it a pleasant time to experience the locale.

September Temperature in San Bernardino

In September in San Bernardino, the average temperature is 16°C (62°F), with maximums reaching 26°C (78°F) and minimums dropping as low as 8°C (47°F). This mild weather makes San Bernardino an ideal destination for outdoor activities and exploring local attractions.

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

The chart illustrates September temperature patterns in San Bernardino, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Bernardino, September typically has an average temperature of 16°C (62°F), with highs reaching up to 26°C (78°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec595959596061616161606060
Data source: Temperature data for San Bernardino 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 Bernardino

In San Bernardino in September, the precipitation amount is 184 mm (7.3 in) over the course of 17 days.

September Precipitation Trends in San Bernardino

The chart displays monthly precipitation patterns in San Bernardino, 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 Bernardino, September typically receives around 184 mm (7.3 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec3254105524603471278249184299179428
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Bernardino

In San Bernardino in September humidity is 42%. With an average temperature of 16°C (62°F), this humidity feels like a comfortable embrace, making it ideal for leisurely strolls and explorations without overwhelming discomfort.

September Average Humidity in San Bernardino

This chart illustrates the average monthly humidity levels in San Bernardino, 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 Bernardino is approximately 42%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%88%85%78%62%44%38%42%58%69%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Bernardino

In San Bernardino in September, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Bernardino.

Maximum UV Index Levels in San Bernardino for September

The chart shows the monthly maximum UV Index (UVI) for San Bernardino 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 Bernardino typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec171718171412131316161615
Data source: San Bernardino 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 Bernardino Compares to Other Months

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

This table compares monthly weather conditions in San Bernardino, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (60°F)325 mm (12.8 inches)83%extreme
February Weather15°C (59°F)410 mm (16.2 inches)81%extreme
March Weather15°C (59°F)552 mm (21.7 inches)88%extreme
April Weather15°C (60°F)460 mm (18.1 inches)85%extreme
May Weather16°C (60°F)347 mm (13.7 inches)78%extreme
June Weather16°C (61°F)127 mm (5.0 inches)62%extreme
July Weather16°C (61°F)82 mm (3.2 inches)44%extreme
August Weather16°C (62°F)49 mm (1.9 inches)38%extreme
September Weather16°C (62°F)184 mm (7.3 inches)42%extreme
October Weather16°C (61°F)299 mm (11.8 inches)58%extreme
November Weather16°C (60°F)179 mm (7.0 inches)69%extreme
December Weather15°C (60°F)428 mm (16.9 inches)82%extreme

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