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September Weather in San Guillermo, Philippines

Last updated: August 27, 2025

In September, the average temperature in San Guillermo, Philippines is a balmy 28°C (82°F). While the thermometer may dip to a comfortable 23°C (73°F) at night, it can soar as high as 36°C (98°F) during the day. Expect 221 mm (8.7 in) of precipitation spread over 25 days, contributing to a lush environment, while the air will feel quite humid with an average humidity of 87%.

September Temperature in San Guillermo

In September in San Guillermo, the average temperature is 28°C (82°F). Maximum temperatures can reach 36°C (98°F), while the minimum can be as low as 23°C (73°F). This warm climate makes it a great destination for those seeking sunshine and outdoor activities.

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

The chart illustrates September temperature patterns in San Guillermo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Guillermo, September typically has an average temperature of 28°C (82°F), with highs reaching up to 36°C (98°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec747478818486848382807976
Data source: Temperature data for San Guillermo 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 Guillermo

In San Guillermo in September, the precipitation amount is 221 mm (8.7 in), occurring over the course of 25 days.

September Precipitation Trends in San Guillermo

The chart displays monthly precipitation patterns in San Guillermo, 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 Guillermo, September typically receives around 221 mm (8.7 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec1591177353148129288240221252237289
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Guillermo

In San Guillermo in September humidity is 87%. With an average temperature of 28°C (82°F), this humidity feels like a warm, thick blanket wrapping around you, making travel challenging as you navigate the air's heavy moisture.

September Average Humidity in San Guillermo

This chart illustrates the average monthly humidity levels in San Guillermo, 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 Guillermo is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%73%71%73%77%85%86%87%87%86%89%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Guillermo

In San Guillermo 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 Guillermo, you can check here.

Maximum UV Index Levels in San Guillermo for September

The chart shows the monthly maximum UV Index (UVI) for San Guillermo 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 Guillermo typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131415141414141413109
Data source: San Guillermo 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 Guillermo Compares to Other Months

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

This table compares monthly weather conditions in San Guillermo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)159 mm (6.3 inches)77%extreme
February Weather24°C (75°F)117 mm (4.6 inches)73%extreme
March Weather26°C (78°F)73 mm (2.9 inches)71%extreme
April Weather27°C (81°F)53 mm (2.1 inches)73%extreme
May Weather29°C (85°F)148 mm (5.8 inches)77%extreme
June Weather30°C (86°F)128 mm (5.1 inches)85%extreme
July Weather29°C (84°F)288 mm (11.3 inches)86%extreme
August Weather29°C (84°F)240 mm (9.5 inches)87%extreme
September Weather28°C (82°F)221 mm (8.7 inches)87%extreme
October Weather27°C (80°F)252 mm (9.9 inches)86%extreme
November Weather26°C (79°F)237 mm (9.3 inches)89%very high
December Weather24°C (76°F)289 mm (11.4 inches)85%very high

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