San Juan Weather in December
December in San Juan brings high temperatures, with daytime highs of 29°C (84°F) and nights around 25°C (77°F). Quite a bit of rainfall is expected, around 101 mm (4 in), so pack an umbrella.
Rainfall in San Juan in December
The climate data from previous years indicates about 20 days of rain, averaging 101 mm (4 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in San Juan in December
December in San Juan brings typical temperatures with highs around 29°C (84°F) and lows of 25°C (77°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in San Juan in December
The city usually sees around 215 hours of sunlight, indicating many sunny days — a great month for sightseeing.
Average water temperature in December
The water temperature is 28°C (82°F), which most people find very comfortable. A good month for swimming and water sports.If your ideal day consists of dry skies and pleasant temperatures, January, February and March typically offer the best circumstances for San Juan.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Trinidad & Tobago, check out our San Juan's climate page.
San Juan Temperature in December
Min Temperature
25°C (77°F)
Max Temperature
29°C (84°F)
Water Temperature
28°C (82°F) *
Chance of Rain
68%
Precipitation
101 mm (4 in)
Rainy days
20 days
Humidity
84% *
Sunshine
215 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in San Juan typically stay consistent throughout December, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 23°C (73°F).
Average temperatures in December
Historical weather for San Juan in December
Browse day-by-day weather records for San Juan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Juan historical weather extremes in December
Based on 22 years of weather observations (2003-2025), these are the most extreme conditions recorded in San Juan.
- On December 31, 2014, temperatures climbed to 35°C (95°F), marking the warmest December day on record.
- The lowest daytime temperature in December was 24°C (75°F), recorded on December 11, 2019.
- San Juan registered its coldest December night on December 10, 2022, with temperatures dropping to 20°C (68°F).
Best Places in Trinidad & Tobago in December
Find out more about the weather in Trinidad & Tobago and which places have the best travel conditions in this month. See all of Trinidad & Tobago in December →
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What to Wear in San Juan in December
Warm but pleasant conditions in San Juan in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 28°C (82°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in San Juan in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Trinidad & Tobago, check out our San Juan's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full San Juan climate overview or explore weather in Trinidad & Tobago.
