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Puerto RicoThe weather in December in San Juan
It's hot in December in San Juan with an average temperature of 30°C. Temperatures this month range from a low of 29°C to a high of 30°C. At night, you can expect temperatures between 24°C and 25°C.
Looking for sun? December isn’t a good month to be in San Juan. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in December for San Juan, Puerto Rico. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 32°C in 2019, San Juan reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 26°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 21°C to a highest value of 27°C.
Water temperature
The water temperature at San Juan is 29°C this month. Nice and warm for a swim.
Rainfall amount
In December, there is an average of 117 mm of precipitation, spread over 14 days. The wind speed is around 4 Bft, mostly coming from the East.
Daily weather in December for San Juan
Click on any day in December to get detailed info about the usual weather on that day in San Juan. Check out the historical temperatures and precipitation over the past 10 years on this day.
December weather comparison
| San Juan | New York | |
|---|---|---|
| Average temperature | 30°C | 9°C |
| Max. temperature | 30°C | 12°C |
| Min. temperature | 24°C | -5°C |
| Total precipitation | 117 mm | 133 mm |
| Rainy days | 14 days | 17 days |
Start of December
The month of December starts in San Juan with hot temps, averaging around 30°C during the day and nights around 25°C.
Mid December
By mid-December, daytime temps stay steady at around 30°C, with nights around 25°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of December
By the end of December, the average daytime temperature in San Juan is around 30°C, while nighttime temps are about 25°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
The hurricane season in San Juan runs from June to November.
Check out the climate of San Juan for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in December in San Juan, Puerto Rico. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in December in San Juan
Temperature in December in San Juan over the years
Precipitation charts
These charts show the average amount of precipitation in December in San Juan, Puerto Rico. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in December in San Juan
Total precipitation in December in San Juan over the years
Daily UV index in December in San Juan
This chart shows the average daily UV index in December in San Juan, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in December in San Juan
Have you been to San Juan in December?
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Average weather in San Juan by month
Click on a month below to see detailed weather info for San Juan. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.