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September Weather in San Isidro, Peru

Last updated: August 27, 2025

In September, the average temperature in San Isidro, Peru hovers around 26°C (79°F), making it a pleasant time to visit. Expect a minimum of 21°C (70°F) and a maximum of 35°C (95°F), providing a warm range suitable for various activities. However, be prepared for some rain, as 175 mm (6.9 in) of precipitation may fall over 24 days. With an average humidity of 55%, the atmosphere will feel comfortably warm, perfect for enjoying all that this destination has to offer!

September Temperature in San Isidro

In September in San Isidro, the average temperature is 26°C (79°F). Maximums can reach 35°C (95°F), while minimums can dip as low as 21°C (70°F). This mild climate makes San Isidro a perfect destination for travelers seeking pleasant weather and outdoor adventures.

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

The chart illustrates September temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, September typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (95°F) and lows dropping to around 21°C (70°F).
JanFebMarAprMayJunJulAugSepOctNovDec787978787878777879797978
Data source: Temperature data for San Isidro 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 Isidro

In San Isidro in September, the total precipitation amount is 175 mm (6.9 in) distributed over 24 days.

September Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, September typically receives around 175 mm (6.9 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec275284329323245186159121176211245322
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Isidro

In San Isidro in September humidity is 55%. With an average temperature of 26°C (79°F), this humidity feels like a warm embrace, making it pleasant for leisurely strolls and outdoor exploration, though occasional breaks in shaded areas might be needed to stay comfortable.

September Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%82%85%91%85%74%59%55%57%74%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Isidro

In San Isidro 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 Isidro, you can check here.

Maximum UV Index Levels in San Isidro for September

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151617161312111214141313
Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (78°F)275 mm (10.8 inches)83%extreme
February Weather26°C (79°F)284 mm (11.2 inches)78%extreme
March Weather26°C (79°F)329 mm (13.0 inches)82%extreme
April Weather26°C (79°F)323 mm (12.7 inches)85%extreme
May Weather26°C (78°F)245 mm (9.7 inches)91%extreme
June Weather25°C (78°F)186 mm (7.3 inches)85%extreme
July Weather25°C (77°F)159 mm (6.3 inches)74%extreme
August Weather26°C (78°F)121 mm (4.8 inches)59%extreme
September Weather26°C (79°F)175 mm (6.9 inches)55%extreme
October Weather26°C (79°F)211 mm (8.3 inches)57%extreme
November Weather26°C (79°F)245 mm (9.6 inches)74%extreme
December Weather26°C (79°F)322 mm (12.7 inches)87%extreme

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