Weather in San Juan in December 2024
Average weather
Average temperature in San Juan in December
Going from a maximum of +88°F during the day to a minimum of +68°F during the night, the temperature in December averages around +82°F.
The average maximum temperature goes down 18% by the end of the month, compared with the beginning of the month, from +86°F to +82°F.
Is San Juan warm or cold in December?
San Juan is typically warm in December.
Maximum temperatures go down compared to the previous month from +84°F to +82°F. The minimum temperature also goes down from +75°F to +73°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how December is compared to other months in San Juan:
Water temperature in San Juan in December
Water in San Juan in December is Warm. It varies from +81°F to +83°F, with an average of +82°F. This is almost similar to the air temperature, which averages +82°F.
In December, water temperatures are average relative to the rest of the year:
Can you swim in San Juan in December?
Climate in San Juan in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +82°F | +82°F | ||||
| Min. temperature | ||||||
| +70°F | +68°F | +66°F | ||||
| Max. temperature | ||||||
| +93°F | +93°F | +88°F | ||||
| Rainfall | ||||||
| 106 mm | 48 mm | 38 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +83°F | +82°F | +80°F | ||||
| Humidity | ||||||
| 79% | 78% | 77% | ||||
| Air pressure | ||||||
| 1013 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 1 | 2 | 2 | ||||
| Cloudy days | ||||||
| 4 | 7 | 8 | ||||
| Rainy days | ||||||
| 23 | 21 | 21 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
December often has better weather than November. It’s getting colder in December. From +84°F in the day, the average maximum temperature lowers to +82°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 106 mm to 48 mm. It feels drier, as humidity decreases from 79% to 78%. The average wind speed doesn’t change much during December, staying around 2 m/s. The good news is there are likely to be more sunny days in December, from 1 to 2.
January brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Juan is gradually decreasing during December, going from 5 m/s to 2 m/s over the course of the month.
Rain
How was the weather last December in San Juan?
Climate Change Over the Years
The climate in San Juan in December has not changed that much over the last 43 years.
The average temperature was the lowest in 2008 (+84°F) and the highest in 2013 (+87°F). The driest year was 1994 with only 675 mm of rainfall, and the wettest year was 2023 with 2338 mm.
FAQ
Is December a good time to visit San Juan?
Can you sunbathe in San Juan in December?
Can you swim in San Juan in December?
Is San Juan rainy in December?
Is it sunny in San Juan in December?
Monthly weather in San Juan
Source of the data
For this page, we’ve looked at the typical weather in San Juan, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.