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September Weather in Santiago, Philippines

Last updated: August 27, 2025

In September, the average temperature in Santiago, Philippines is a warm 28°C (83°F), with minimum temperatures dropping to 25°C (78°F) and maximum highs reaching 31°C (87°F). Expect significant rainfall, as 215 mm (8.5 in) of precipitation typically falls over 23 days, resulting in an average humidity of about 90%.

September Temperature in Santiago

In September in Santiago, the average temperature is 28°C (83°F). Maximums can reach 31°C (87°F), while minimums can be as low as 25°C (78°F). Travelers can expect warm and pleasant weather, perfect for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Santiago, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santiago, September typically has an average temperature of 28°C (83°F), with highs reaching up to 31°C (87°F) and lows dropping to around 25°C (78°F).
JanFebMarAprMayJunJulAugSepOctNovDec808081818282828382828281
Data source: Temperature data for Santiago 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 Santiago

In Santiago in September, the total precipitation amount is 215 mm (8.5 in) measured over the course of 23 days.

September Precipitation Trends in Santiago

The chart displays monthly precipitation patterns in Santiago, 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 Santiago, September typically receives around 215 mm (8.5 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec1771027048115223217175215235174264
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santiago

In Santiago in September humidity is 90%. With an average temperature of 28°C (83°F), this humidity feels like walking through a warm, damp blanket, making travel strenuous and uncomfortable as sweat clings to your skin, and the air feels thick and heavy with moisture.

September Average Humidity in Santiago

This chart illustrates the average monthly humidity levels in Santiago, 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 Santiago is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%80%77%78%85%87%88%89%90%87%90%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santiago

In Santiago 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 Santiago, you can check here.

Maximum UV Index Levels in Santiago for September

The chart shows the monthly maximum UV Index (UVI) for Santiago 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 Santiago typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131316161413131414141211
Data source: Santiago 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 Santiago Compares to Other Months

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

This table compares monthly weather conditions in Santiago, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (80°F)177 mm (7.0 inches)85%extreme
February Weather27°C (80°F)102 mm (4.0 inches)80%extreme
March Weather27°C (81°F)70 mm (2.8 inches)77%extreme
April Weather27°C (82°F)48 mm (1.9 inches)78%extreme
May Weather28°C (83°F)115 mm (4.5 inches)84%extreme
June Weather28°C (83°F)223 mm (8.8 inches)87%extreme
July Weather28°C (83°F)217 mm (8.5 inches)88%extreme
August Weather28°C (83°F)175 mm (6.9 inches)89%extreme
September Weather28°C (83°F)215 mm (8.5 inches)90%extreme
October Weather28°C (82°F)235 mm (9.3 inches)87%extreme
November Weather28°C (82°F)174 mm (6.8 inches)90%extreme
December Weather27°C (81°F)264 mm (10.4 inches)91%extreme

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