Last updated: August 27, 2025
In December, the average temperature in San Juan, Philippines is a warm 27°C (82°F), with temperatures ranging from a comfortable 23°C (75°F) to a toasty 33°C (91°F). Expect a fair amount of rain, with about 160 mm (6.3 in) of precipitation spread over 11 days. The air will feel quite humid, with an average humidity level of 86%, so be prepared for a tropical atmosphere!
In December in San Juan, the average temperature is 27°C (82°F), with maximums reaching 33°C (91°F) and minimums dipping to 23°C (75°F). This pleasant climate makes it an ideal time for travelers to explore the area and enjoy outdoor activities.
In San Juan in December, the precipitation amount is 160 mm (6.3 in) over a span of 11 days.
In San Juan in December humidity is 86%. With an average temperature of 27°C (82°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities a challenge and necessitating frequent breaks to stay hydrated while traveling.
In San Juan in December, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 December’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 27°C (80°F) | 71 mm (2.8 inches) | 76% | extreme |
| February Weather | 27°C (81°F) | 21 mm (0.8 inches) | 71% | extreme |
| March Weather | 29°C (84°F) | 12 mm (0.5 inches) | 68% | extreme |
| April Weather | 30°C (86°F) | 13 mm (0.5 inches) | 69% | extreme |
| May Weather | 30°C (87°F) | 91 mm (3.6 inches) | 76% | extreme |
| June Weather | 29°C (85°F) | 199 mm (7.8 inches) | 87% | extreme |
| July Weather | 28°C (83°F) | 362 mm (14.2 inches) | 88% | extreme |
| August Weather | 28°C (83°F) | 290 mm (11.4 inches) | 89% | extreme |
| September Weather | 28°C (83°F) | 290 mm (11.4 inches) | 89% | extreme |
| October Weather | 28°C (83°F) | 181 mm (7.1 inches) | 86% | extreme |
| November Weather | 28°C (83°F) | 120 mm (4.7 inches) | 89% | very high |
| December Weather | 27°C (82°F) | 160 mm (6.3 inches) | 86% | very high |