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September Weather in San Fernando, Peru

Last updated: August 27, 2025

In San Fernando, Peru, the average temperature in September is a warm 27°C (81°F), with minimums dipping to 20°C (68°F) and maximums soaring to 36°C (97°F). You'll experience 145 mm (5.7 in) of precipitation spread over 15 days, contributing to an average humidity level of 40%. Get ready for a mix of warmth and refreshing showers!

September Temperature in San Fernando

In September in San Fernando, the average temperature is 27°C (81°F). The maximum can reach 36°C (97°F) and the minimum can be as low as 20°C (68°F). This makes it an ideal time to explore the local attractions while enjoying warm weather.

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

The chart illustrates September temperature patterns in San Fernando, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Fernando, September typically has an average temperature of 27°C (81°F), with highs reaching up to 36°C (97°F) and lows dropping to around 20°C (68°F).
JanFebMarAprMayJunJulAugSepOctNovDec808079797978787981818080
Data source: Temperature data for San Fernando 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 Fernando

In San Fernando in September, the precipitation amount is 145 mm (5.7 in) spread over the course of 15 days.

September Precipitation Trends in San Fernando

The chart displays monthly precipitation patterns in San Fernando, 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 Fernando, September typically receives around 145 mm (5.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec2823584182731841079992145209293283
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Fernando

In San Fernando in September humidity is 40%. With an average temperature of 27°C (81°F), this humidity feels like a pleasant breeze, making it comfortable for exploring the outdoors and enjoying various activities without feeling overly sticky or drenched in sweat.

September Average Humidity in San Fernando

This chart illustrates the average monthly humidity levels in San Fernando, 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 Fernando is approximately 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%86%88%82%67%48%39%40%51%74%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Fernando

In San Fernando 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 Fernando, you can check here.

Maximum UV Index Levels in San Fernando for September

The chart shows the monthly maximum UV Index (UVI) for San Fernando 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 Fernando typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616151211111214151514
Data source: San Fernando 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 Fernando Compares to Other Months

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

This table compares monthly weather conditions in San Fernando, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (80°F)282 mm (11.1 inches)85%extreme
February Weather26°C (80°F)357 mm (14.1 inches)82%extreme
March Weather26°C (79°F)418 mm (16.5 inches)86%extreme
April Weather26°C (79°F)273 mm (10.7 inches)88%extreme
May Weather26°C (79°F)184 mm (7.2 inches)82%extreme
June Weather26°C (79°F)107 mm (4.2 inches)67%extreme
July Weather25°C (78°F)99 mm (3.9 inches)48%extreme
August Weather26°C (80°F)92 mm (3.6 inches)39%extreme
September Weather27°C (81°F)145 mm (5.7 inches)40%extreme
October Weather27°C (81°F)209 mm (8.2 inches)51%extreme
November Weather27°C (81°F)293 mm (11.5 inches)74%extreme
December Weather27°C (80°F)283 mm (11.1 inches)89%extreme

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