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September Weather in San Luis, Peru

Last updated: August 27, 2025

In September, the average temperature in San Luis, Peru hovers around 8°C (47°F). Temperatures can dip as low as -1°C (31°F) and reach a maximum of 18°C (64°F). Expect 97 mm (3.8 in) of precipitation spread over 19 days, with an average humidity of 37%.

September Temperature in San Luis

In September in San Luis, the average temperature is 8°C (47°F). Maximum temperatures can reach 18°C (64°F), while minimums can drop as low as -1°C (31°F). This makes San Luis a great destination for travelers looking to experience a cool climate with the possibility of mild sunny days.

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

The chart illustrates September temperature patterns in San Luis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Luis, September typically has an average temperature of 8°C (47°F), with highs reaching up to 18°C (64°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec484948484847464647484949
Data source: Temperature data for San Luis 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 Luis

In San Luis in September, the precipitation amount is 97 mm (3.8 in) spread over the course of 19 days.

September Precipitation Trends in San Luis

The chart displays monthly precipitation patterns in San Luis, 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 Luis, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec2402232711608745364397179222250
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Luis

In San Luis in September, humidity is 37%. With an average temperature of 8°C (47°F), this humidity feels like a refreshing coolness that makes exploring the area invigorating, but travelers should be prepared for the occasional chill in the air as they venture out.

September Average Humidity in San Luis

This chart illustrates the average monthly humidity levels in San Luis, 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 Luis 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 Luis

In San Luis 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 San Luis, you can check Hourly UV Index in San Luis.

Maximum UV Index Levels in San Luis for September

The chart shows the monthly maximum UV Index (UVI) for San Luis 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 Luis typically reaches 17, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181919181513141417181717
Data source: San Luis 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 Luis Compares to Other Months

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

This table compares monthly weather conditions in San Luis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)240 mm (9.4 inches)88%extreme
February Weather9°C (49°F)223 mm (8.8 inches)86%extreme
March Weather9°C (48°F)271 mm (10.7 inches)89%extreme
April Weather9°C (48°F)160 mm (6.3 inches)89%extreme
May Weather9°C (48°F)87 mm (3.4 inches)86%extreme
June Weather8°C (47°F)45 mm (1.8 inches)71%extreme
July Weather8°C (46°F)36 mm (1.4 inches)44%extreme
August Weather8°C (47°F)43 mm (1.7 inches)34%extreme
September Weather8°C (47°F)97 mm (3.8 inches)37%extreme
October Weather9°C (48°F)179 mm (7.1 inches)50%extreme
November Weather9°C (49°F)222 mm (8.7 inches)73%extreme
December Weather9°C (49°F)250 mm (9.9 inches)91%extreme

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