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September Weather in San Alejandro, Peru

Last updated: August 27, 2025

In September, the average temperature in San Alejandro, Peru hovers around a pleasant 27°C (81°F). Expect temperatures to range from a cool 19°C (66°F) to a sizzling 38°C (101°F). However, don't forget your umbrella; 117 mm (4.6 in) of precipitation is likely over 15 days this month. Humidity levels are relatively low, averaging 37%, making it a comfortable time to explore!

September Temperature in San Alejandro

In September in San Alejandro, the average temperature is 27°C (81°F), with maximums reaching up to 38°C (101°F) and minimums dipping as low as 19°C (66°F). This makes it a great time for travelers to enjoy warm weather while still having cooler evenings for relaxation.

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

The chart illustrates September temperature patterns in San Alejandro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Alejandro, September typically has an average temperature of 27°C (81°F), with highs reaching up to 38°C (101°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec787978787877777980797979
Data source: Temperature data for San Alejandro 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 Alejandro

In San Alejandro in September, the total precipitation amount is 117 mm (4.6 in), occurring over the course of 15 days.

September Precipitation Trends in San Alejandro

The chart displays monthly precipitation patterns in San Alejandro, 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 Alejandro, September typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec304364406240178998676117236341308
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Alejandro

In San Alejandro in September, humidity is 37%. With an average temperature of 27°C (81°F), this humidity feels like a comfortable embrace for traveling, allowing for enjoyable outdoor exploration without the heaviness often associated with higher humidity levels.

September Average Humidity in San Alejandro

This chart illustrates the average monthly humidity levels in San Alejandro, 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 Alejandro is approximately 37%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%86%89%89%86%71%44%34%37%50%73%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Alejandro

In San Alejandro 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 Alejandro, you can check here.

Maximum UV Index Levels in San Alejandro for September

The chart shows the monthly maximum UV Index (UVI) for San Alejandro 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 Alejandro typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616161211111214141514
Data source: San Alejandro 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 Alejandro Compares to Other Months

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

This table compares monthly weather conditions in San Alejandro, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (79°F)304 mm (12.0 inches)88%extreme
February Weather26°C (79°F)364 mm (14.3 inches)86%extreme
March Weather26°C (78°F)406 mm (16.0 inches)89%extreme
April Weather26°C (78°F)240 mm (9.4 inches)89%extreme
May Weather25°C (78°F)178 mm (7.0 inches)86%extreme
June Weather25°C (77°F)99 mm (3.9 inches)71%extreme
July Weather25°C (77°F)86 mm (3.4 inches)44%extreme
August Weather26°C (79°F)76 mm (3.0 inches)34%extreme
September Weather27°C (81°F)117 mm (4.6 inches)37%extreme
October Weather26°C (80°F)236 mm (9.3 inches)50%extreme
November Weather26°C (79°F)341 mm (13.4 inches)73%extreme
December Weather26°C (79°F)308 mm (12.1 inches)91%extreme

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