December Weather in San Juan

Last updated: March 2, 2024

The weather in San Juan, Mexico, during December is characterized by an average temperature of 17°C (64°F). Highs can soar to 32°C (90°F), while lows may dip to 4°C (40°F). Typically, the humidity level in San Juan throughout December hovers around 86%.

4°C (40°F)

Minimum temperature

17°C (64°F)

Average temperature

32°C (90°F)

Maximum temperature

86%

Humidity

Precipitation and Sunshine hours

In December, San Juan averages 20 mm (0.8 inches) of rainfall, typically over the course of 3 rainy days. The month enjoys an average of 10 hours 33 minutes of daylight, with the sun shining for approximately 8 hours 29 minutes each day. Additionally, there is a 59% probability of sunny days during this period.

20 mm (0.8 inches)

Precipitation

3 rainy days

Rainy days

8 hours 29 minutes

Sunshine hours

59%

Chance of sun

UV Index

In December, the UV Index in San Juan reaches a maximum of 6, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 25 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 0 1 2 3 5 6 6 4 3 2 1 0 0
Exposure Low Moderate High Moderate Low
Time to burn 45 min 30 min 25 min 30 min 45 min

Compare San Juan's Climate with Cities Worldwide