September Weather in San Jose, Philippines

Last updated: August 27, 2025

In September, the average temperature in San Jose, Philippines is a warm 27°C (81°F), with daily highs reaching up to 31°C (88°F) and lows dipping to 24°C (75°F). Expect significant rainfall, with an average precipitation of 230 mm (9.0 in) spread over 25 days, contributing to a high average humidity of 89%.

September Temperature in San Jose

In September in San Jose, the average temperature is 27°C (81°F). Maximums can reach 31°C (88°F) and minimums can be as low as 24°C (75°F). This pleasant weather makes San Jose an ideal destination for travelers seeking warmth and sunshine.

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

The chart illustrates September temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, September typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (88°F) and lows dropping to around 24°C (75°F).

Data source: Temperature data for San Jose generated using information from the Copernicus Climate Change Service.

September Precipitation in San Jose

In San Jose in September, the precipitation amount is 230 mm (9.0 in) over the course of 25 days.

September Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 Jose, September typically receives around 230 mm (9.0 inches) of precipitation spread over approximately 25 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in San Jose

In San Jose in September humidity is 89%. With an average temperature of 27°C (81°F), this humidity feels like a wet blanket enveloping you, making outdoor activities challenging and travel a little less comfortable.

September Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 Jose is approximately 89%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Jose

In San Jose in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for September

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 Jose typically reaches 15, which falls under the extreme exposure category.

Data source: San Jose 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 Jose Compares to Other Months

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

This table compares monthly weather conditions in San Jose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	155 mm (6.1 inches)	88%	extreme
February Weather	26°C (79°F)	124 mm (4.9 inches)	86%	extreme
March Weather	27°C (80°F)	121 mm (4.8 inches)	84%	extreme
April Weather	27°C (81°F)	85 mm (3.3 inches)	82%	extreme
May Weather	28°C (82°F)	194 mm (7.6 inches)	83%	extreme
June Weather	27°C (82°F)	187 mm (7.4 inches)	85%	extreme
July Weather	27°C (81°F)	227 mm (8.9 inches)	86%	extreme
August Weather	27°C (81°F)	187 mm (7.4 inches)	87%	extreme
September Weather	27°C (81°F)	230 mm (9.0 inches)	89%	extreme
October Weather	27°C (81°F)	238 mm (9.4 inches)	85%	extreme
November Weather	27°C (81°F)	206 mm (8.1 inches)	87%	extreme
December Weather	27°C (80°F)	214 mm (8.4 inches)	91%	extreme