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September Weather in Peru, United States

Last updated: June 24, 2025

In September, the average temperature in Peru, United States hovers around 15°C (60°F), making it a comfortable time to explore. However, brace yourself for temperature swings, as lows can drop to -2°C (29°F) while highs may reach up to 31°C (88°F). Expect about 64 mm (2.5 in) of precipitation spread over 8 days, adding to the region's charm. With an average humidity of 77%, the air is pleasantly fresh, contributing to a vibrant atmosphere.

September Temperature in Peru

In September in Peru, the average temperature is 15°C (60°F), with maximums reaching 31°C (88°F) and minimums dipping as low as -2°C (29°F). This varied climate makes it essential for travelers to pack layers and be prepared for both warm days and chilly nights.

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 15°C (60°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec182128415363686760483423
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 precipitation amount is 64 mm (2.5 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 64 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec83867212887841339064128107120
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 77%. With an average temperature of 15°C (60°F), this humidity feels like you're wading through a warm, heavy blanket, making travel feel more exhausting and sticky than usual.

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 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
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-8°C (18°F)83 mm (3.3 inches)91%low
February Weather-6°C (21°F)86 mm (3.4 inches)89%moderate
March Weather-2°C (29°F)72 mm (2.8 inches)85%moderate
April Weather5°C (41°F)128 mm (5.0 inches)84%very high
May Weather12°C (54°F)87 mm (3.4 inches)78%very high
June Weather17°C (64°F)84 mm (3.3 inches)72%very high
July Weather20°C (69°F)133 mm (5.2 inches)75%very high
August Weather19°C (67°F)90 mm (3.5 inches)74%very high
September Weather15°C (60°F)64 mm (2.5 inches)77%high
October Weather9°C (48°F)128 mm (5.0 inches)85%moderate
November Weather1°C (34°F)107 mm (4.2 inches)86%moderate
December Weather-5°C (23°F)120 mm (4.7 inches)85%low

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