December · Puerto Rico
Best time to visit San Juan in December Weather, crowds & prices
Weather in San Juan in December
Average temperature 26°C, 77 mm of rain, about 15 days with 6+ hours of sunshine and 79% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
7.7/10
Ranked #10 of 12 months
- Avg temp
- 26°C
- Rainfall
- 77 mm
- Humidity
- 79%
- Days with 6h+ sun
- 15
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
December in San Juan scores 7.7/10 for beach and coastal travel - ranked #10 of 12. Expect around 26°C, 77 mm of rain, and roughly 15 days with 6+ hours of sunshine this month.
Old San Juan's blue cobbles, fortresses and salsa bars face the Atlantic in Puerto Rico's capital.
December in San Juan — reliably good (10th best month)
Days in December average 26°C (79°F) and humidity near 79% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 77 mm of rain this month — a flexible day or two helps — with about 15 days with 6+ hours of sunshine and 10.9 hours of daylight to work around it.
That is 7.7/10 on the same scale — 10th of 12 months, versus 9.4/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, March is materially better in San Juan — 1.7 points higher on the same scale.
Frequently asked
- What is the weather like in San Juan in December?
- In December, San Juan averages 26°C, 77 mm of rain, and about 15 days with 6+ hours of sunshine. Its climate-comfort score is 7.7/10.
- Is December a good time to visit San Juan?
- December earns a 7.7/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in San Juan in December?
- Expect about 77 mm of rain in December. Average humidity is 79% and there are about 15 days with 6+ hours of sunshine.
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