San Juan in december: average Weather, Temperature and Climate
Weather in San Juan in december 2026
The weather in San Juan in the month of december comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout december
perfect weather UV index: 7
Weather at 6am
79°F
Partly Cloudy
35% of time
33%
30%
3%
Weather at 12pm
83°F
Clear/Sunny
43% of time
28%
26%
3%
Weather at 6pm
79°F
Partly Cloudy
44% of time
32%
19%
5%
Weather at 3am
77°F
40%
31%
27%
3%
Evolution of daily average temperature and precipitation in San Juan in december
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Juan in december.
The climate of San Juan in december is perfect
the weather in San Juan in december is wet (with 2.4in of rainfall over 3 days). This is better than the previous month since in november it receives an average of 4.1in of rainfall over 6 days.
The climate pleasant there december. Temperatures are up to 83°F. The seasonal minimum is 79°F. Thus, the mean temperature average in december in San Juan is 81°F. These temperatures are far removed from those records observed in San Juan in december with a maximum record of 90°F in 2021 and a minimum record of 70°F in 2021. You can expect to have about 1 days with temperatures up to 86°F, or 3 of time.
On average, in San Juan, the days of december last 11:02. Sunrise is at 06:49 and sets at 17:51.
With a correct weather, this month is okay (but not the best) to go in that area.
Seasonal average climate and temperature of San Juan in december
Check below seasonal norms These datas are generated from the weather statements earlier years of december.
| December | |||||
| Outside temperature | |||||
| Average temperature | 81°F | ||||
| Highest temperature | 83°F | ||||
| Lowest temperature | 79°F | ||||
| Highest record temperature | 90°F (2021) | ||||
| Lowest record temperature | 70°F (2021) | ||||
| Number of days at +86°F | 1 day(s) (3%) | ||||
| Number of days at +65°F | 31 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 82°F | ||||
| Lowest sea temperature | 81°F | ||||
| Highest sea temperature | 83°F | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 79°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 2.4in | ||||
| Number of days with rainfall | 3 day(s) (11%) | ||||
| Record daily rainfall | 1.3in (2013) | ||||
| Other climate data | |||||
| Humidity | 81% | ||||
| Visibility | 9.8km | ||||
| Cloud cover | 35% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 9 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:49 | ||||
| Time of sunset | 17:51 | ||||
| Length of day | 11:02 | ||||
| Our opinion about the weather in december | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last december?
Here is the day by day recorded weather in San Juan in december 2025:
79°F to 83°F
79°F to 85°F
76°F to 85°F
79°F to 83°F
79°F to 81°F
79°F to 83°F
77°F to 81°F
77°F to 86°F
79°F to 88°F
79°F to 85°F
79°F to 86°F
79°F to 83°F
79°F to 85°F
79°F to 88°F
76°F to 86°F
77°F to 86°F
76°F to 79°F
77°F to 81°F
77°F to 85°F
77°F to 81°F
77°F to 81°F
77°F to 79°F
77°F to 81°F
77°F to 79°F
77°F to 79°F
76°F to 81°F
76°F to 81°F
67°F to 76°F
68°F to 77°F
76°F to 83°F
74°F to 85°F
Map: other cities in Puerto Rico in december
Cities near San Juan:
| Bayamón in december | good weather |
| Dorado in december | perfect weather |
| Carolina in december | good weather |
| Vega Alta in december | perfect weather |
| Caguas in december | good weather |
| Comerio in december | good weather |
| Cidra in december | good weather |
| Cayey in december | good weather |
| Aibonito in december | good weather |
| Manati in december | perfect weather |
| Luquillo in december | good weather |
| Humacao in december | good weather |
Click over cities on the map for information about the weather in december.
San Juan
perfect weather
good
tolerable
bad
very bad
Weather data for San Juan in december:
Weather data for San Juan for december are derived from an average of the weather forecast since 2009 in San Juan. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Juan can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to San Juan.