Start of the drier season · Weather & things to do
Old San Juan in December
Little changes in Old San Juan from November: highs stay near 82°F (28°C), lows near 76°F (24°C), and about 2.5 in (64 mm) of rain falls.
December opens the best stretch on our comfort score, at 77/100 (4th of 12).
- Avg high
- 82°F (28°C)
- Avg low
- 76°F (24°C)
- Rain
- 2.5 in (64 mm)
- Humidity
- 79%
- Cloud cover
- 61%
- Daylight
- ~10 h 54 min
- Comfort score
- 77/100 · Great
What December feels like
Highs settle around 82°F (28°C), warm enough for short sleeves.
Even at night it stays warm, around 76°F (24°C).
Humidity averages 79%, so the air feels sticky and the heat feels stronger than the thermometer says.
Some rain is likely, about 2.5 in (64 mm) in the month, so pack for a shower or two.
Plan around December
December is one of Old San Juan's best months on the climate data.
- The drier spell starts: rain falls to 2.5 in (64 mm) after 5.4 in (137 mm) in November.
- Opens the best-scoring stretch on our comfort score: December – March.
- Shortest days of the year, about 10 h 54 min of daylight.
- Comfort improves from 63/100 in November to 77/100.
- Our Old San Juan & Ponce route is planned for Dec – mid-Jan, a window set by the holiday season rather than the weather — December is part of it.
What to pack for December
- Light, breathable clothes82°F afternoons
- Quick-dry fabrics79% average humidity
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Old San Juan in December
December is good outdoor weather here, so these picks lean toward the open air.
Catedral de San Juan Bautista
One of the oldest cathedrals in the Americas, rebuilt in the 1800s, holding the tomb of Juan Ponce de Leon.
Plaza de Armas
Main square of the old city, in front of City Hall, with the island's Christmas tree and lit trees in December.
Why now December scores 77/100 for comfort, good conditions for being outside.
Paseo de la Princesa
Tree-lined 19th-century promenade along the bay under the city walls, ending at the Raices fountain.
Why now Highs near 82°F and 2.5 in of monthly rain make this an easy outdoor pick.
Calle de la Fortaleza
Shop-lined street ending at La Fortaleza, the governor's mansion since the 16th century, hung with wreaths at Christmas.
Why now One to do outside while the weather is on your side.
Casa Cortes ChocoBar
Cafe run by the Cortes chocolate family, serving hot chocolate with cheese, chocolate dishes and breakfast.
Nearby in December
- Ponce in December~46 mi · highs 83°F, 2.1 in rain · similar daytime temperatures, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Old San Juan in December: quick answers
Is December a good time to visit Old San Juan?
Yes. On the climate data it's one of the best months, scoring 77/100. Expect highs of 82°F (28°C) and 2.5 in (64 mm) of rain.
How hot is Old San Juan in December?
Average highs are 82°F (28°C) and average lows 76°F (24°C), making it the 2nd-coldest month by daytime highs.
Does it rain a lot in Old San Juan in December?
Some: about 2.5 in (64 mm) of rain falls across December on average, the 4th-driest month of the year. The annual total is about 47.5 in (1207 mm).
What should I pack for Old San Juan in December?
Bring light, breathable clothes (82°F afternoons), quick-dry fabrics (79% average humidity), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most picks involve some walking).
More on Old San Juan
Routes in season in December
- Old San Juan & Ponce Dec – mid-Jan
Planning Old San Juan in December?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.