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September Weather in Arma, Peru

Last updated: August 27, 2025

In September, the average temperature in Arma, Peru hovers around 4°C (40°F), with a minimum dip to -8°C (19°F) and a mild maximum reaching 13°C (56°F). Expect 137 mm (5.4 in) of precipitation spread over 27 days, accompanied by an average humidity of 53%. Stay prepared for a mix of chilly days and damp conditions!

September Temperature in Arma

In September in Arma, the average temperature is 4°C (40°F), with maximums reaching up to 13°C (56°F) and minimums dipping as low as -8°C (19°F). Visitors should be prepared for chilly conditions and dress in layers to fully enjoy their time exploring this beautiful destination.

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

The chart illustrates September temperature patterns in Arma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arma, September typically has an average temperature of 4°C (40°F), with highs reaching up to 13°C (56°F) and lows dropping to around -8°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec414141403938383939404141
Data source: Temperature data for Arma 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 Arma

In Arma in September, the total precipitation amount is 137 mm (5.4 in) distributed over 27 days.

September Precipitation Trends in Arma

The chart displays monthly precipitation patterns in Arma, 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 Arma, September typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec230257277159101454258137175173217
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Arma

In Arma in September, humidity is 53%. With an average temperature of 4°C (40°F), this humidity feels like a crisp chill in the air, making travel invigorating yet brisk; it's essential to layer up and stay warm while exploring the sights.

September Average Humidity in Arma

This chart illustrates the average monthly humidity levels in Arma, 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 Arma is approximately 53%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%90%89%83%69%56%51%53%68%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Arma

In Arma in September, the maximum UV index reaches an alarming 17, which falls under the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to stay protected. For more details on the hourly UV index in Arma, you can check Hourly UV Index in Arma.

Maximum UV Index Levels in Arma for September

The chart shows the monthly maximum UV Index (UVI) for Arma 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 Arma typically reaches 17, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec192019181512141517191919
Data source: Arma 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 Arma Compares to Other Months

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

This table compares monthly weather conditions in Arma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)230 mm (9.1 inches)89%extreme
February Weather5°C (41°F)257 mm (10.1 inches)89%extreme
March Weather5°C (41°F)277 mm (10.9 inches)90%extreme
April Weather5°C (41°F)159 mm (6.2 inches)89%extreme
May Weather4°C (39°F)101 mm (4.0 inches)83%extreme
June Weather3°C (38°F)45 mm (1.8 inches)69%extreme
July Weather3°C (38°F)42 mm (1.6 inches)56%extreme
August Weather4°C (39°F)58 mm (2.3 inches)50%extreme
September Weather4°C (40°F)137 mm (5.4 inches)53%extreme
October Weather5°C (40°F)175 mm (6.9 inches)68%extreme
November Weather5°C (41°F)173 mm (6.8 inches)81%extreme
December Weather5°C (41°F)217 mm (8.5 inches)87%extreme

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