Last updated: August 27, 2025
In September, the average temperature in San Juan, Philippines reaches a warm 28°C (82°F). You can expect a range from a comfortable 23°C (74°F) to a sizzling 34°C (93°F). Keep in mind that the region sees around 318 mm (12.5 in) of precipitation spread over 26 days, adding to the 87% humidity—perfect for those who enjoy a lush, tropical atmosphere! 🌧️
In September in San Juan, the average temperature is 28°C (82°F). Maximums can reach 34°C (93°F), while minimums can dip to as low as 23°C (74°F). This warm climate makes San Juan an ideal destination for travelers seeking sunny weather and outdoor adventures.
In San Juan in September, the precipitation amount is 318 mm (12.5 in) spread over 26 days, indicating a significant level of rainfall during that period.
In San Juan 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.
In San Juan 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 Juan, you can check here.
UV Risk Categories
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 23°C (74°F) | 107 mm (4.2 inches) | 77% | extreme |
| February Weather | 23°C (74°F) | 107 mm (4.2 inches) | 73% | extreme |
| March Weather | 26°C (78°F) | 52 mm (2.0 inches) | 71% | extreme |
| April Weather | 27°C (81°F) | 40 mm (1.6 inches) | 73% | extreme |
| May Weather | 29°C (85°F) | 139 mm (5.5 inches) | 77% | extreme |
| June Weather | 30°C (85°F) | 180 mm (7.1 inches) | 85% | extreme |
| July Weather | 28°C (83°F) | 340 mm (13.4 inches) | 86% | extreme |
| August Weather | 28°C (83°F) | 315 mm (12.4 inches) | 87% | extreme |
| September Weather | 28°C (82°F) | 318 mm (12.5 inches) | 87% | extreme |
| October Weather | 27°C (80°F) | 265 mm (10.4 inches) | 86% | extreme |
| November Weather | 26°C (79°F) | 304 mm (12.0 inches) | 89% | very high |
| December Weather | 24°C (76°F) | 239 mm (9.4 inches) | 85% | very high |