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September Weather in Peru, United States

Last updated: June 24, 2025

In Peru, United States, the average temperature in September hovers around 17°C (63°F). However, be prepared for some variability, as temperatures can dip to a brisk 2°C (36°F) or soar to a warm 34°C (93°F). On average, you can expect 66 mm (2.6 in) of precipitation over 8 days, coupled with a high humidity level of 78%.

September Temperature in Peru

In September in Peru, the average temperature is 17°C (63°F), with maximums reaching 34°C (93°F) and minimums as low as 2°C (36°F). This wide temperature range makes Peru an exciting destination for travelers seeking both warmth and cooler escapes.

September Weather in Peru: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Peru, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Peru, September typically has an average temperature of 17°C (63°F), with highs reaching up to 34°C (93°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec212330435666717062513728
Data source: Temperature data for Peru 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 Peru

In Peru in September, the total precipitation amount is 66 mm (2.6 in) over the course of 8 days.

September Precipitation Trends in Peru

The chart displays monthly precipitation patterns in Peru, 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 Peru, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec727367102809710194661399972
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Peru

In Peru in September, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

September Average Humidity in Peru

This chart illustrates the average monthly humidity levels in Peru, 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 Peru is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Peru

In Peru in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Peru.

Maximum UV Index Levels in Peru for September

The chart shows the monthly maximum UV Index (UVI) for Peru 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 Peru typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Peru 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 Peru Compares to Other Months

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

This table compares monthly weather conditions in Peru, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)72 mm (2.8 inches)93%low
February Weather-5°C (24°F)73 mm (2.9 inches)92%moderate
March Weather-1°C (31°F)67 mm (2.6 inches)86%moderate
April Weather6°C (44°F)102 mm (4.0 inches)85%very high
May Weather14°C (57°F)80 mm (3.2 inches)80%very high
June Weather19°C (66°F)97 mm (3.8 inches)74%very high
July Weather22°C (72°F)101 mm (4.0 inches)76%very high
August Weather21°C (70°F)94 mm (3.7 inches)75%very high
September Weather17°C (63°F)66 mm (2.6 inches)78%high
October Weather11°C (51°F)139 mm (5.5 inches)86%moderate
November Weather3°C (37°F)99 mm (3.9 inches)88%moderate
December Weather-2°C (29°F)72 mm (2.8 inches)89%low

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