Last updated: August 27, 2025
In San Juan, Philippines, the average temperature in September hovers around 27°C (81°F). Expect minimums of 25°C (77°F) and delightful highs reaching up to 30°C (86°F). However, be prepared for some rain, as 190 mm (7.5 in) of precipitation is expected over 23 days. With an average humidity of 89%, it’s a great time to embrace the tropical vibe!
In September in San Juan, the average temperature is 27°C (81°F). The maximum can reach 30°C (86°F) and the minimum can be as low as 25°C (77°F). It's a perfect time to visit San Juan for warm and pleasant weather!
In San Juan in September, the total precipitation amount is 190 mm (7.5 in), spread over a duration of 23 days.
In San Juan 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.
In San Juan 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 Juan.
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 | 26°C (79°F) | 186 mm (7.3 inches) | 88% | extreme |
| February Weather | 26°C (79°F) | 137 mm (5.4 inches) | 86% | extreme |
| March Weather | 26°C (80°F) | 98 mm (3.9 inches) | 84% | extreme |
| April Weather | 27°C (80°F) | 72 mm (2.8 inches) | 82% | extreme |
| May Weather | 27°C (82°F) | 184 mm (7.2 inches) | 83% | extreme |
| June Weather | 27°C (82°F) | 158 mm (6.2 inches) | 85% | extreme |
| July Weather | 27°C (81°F) | 183 mm (7.2 inches) | 86% | extreme |
| August Weather | 27°C (81°F) | 143 mm (5.6 inches) | 87% | extreme |
| September Weather | 27°C (81°F) | 190 mm (7.5 inches) | 89% | extreme |
| October Weather | 27°C (81°F) | 227 mm (9.0 inches) | 85% | extreme |
| November Weather | 27°C (81°F) | 247 mm (9.7 inches) | 87% | extreme |
| December Weather | 27°C (80°F) | 243 mm (9.5 inches) | 91% | extreme |