San Juan, Puerto Rico weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Good
Best time to visit: December – April
What is the weather like in San Juan, Puerto Rico in December?
In December, San Juan, Puerto Rico is hot: daytime highs average 28 °C, and even at night it stays warm at around 22 °C. The sea averages 27.4 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 12 rainy days and 47 mm in total. The air is often humid and muggy. All in all, December is a good month for a holiday in San Juan, Puerto Rico.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 51 | 70 | 75 |
| Day | 29° | 28° | 28° |
| Night | 23° | 22° | 22° |
| Sea | 29° | 27° | 27° |
| Sun | 7 h | 8 h | 8 h |
| Rain days | 18 | 12 | 10 |
More details for December
- Daylight
- 11 h 2 min06:49 – 17:50
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 19 km/haverage daily peak
- Cloud cover
- 41 %on average
- Hot days
- 2 days30 °C or more
- Time zone
- UTC−4America/Puerto_Rico
How the score comes together
- Temperatureweight 50 %85 %
- Sunshineweight 20 %75 %
- Few rainy daysweight 30 %40 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
San Juan, Puerto Rico in December: quick answers
Is San Juan, Puerto Rico hot in December?
Yes. In December, San Juan, Puerto Rico is hot: daytime highs average 28 °C and nights stay around 22 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in San Juan, Puerto Rico in December?
Yes. In December the sea averages 27.4 °C – lovely and warm for swimming.
Does it rain much in San Juan, Puerto Rico in December?
Rain is frequent, with about 12 rainy days and 47 mm in total.
San Juan, Puerto Rico month by month
The whole year in San Juan, Puerto RicoAll destinations: Puerto RicoWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)