Middle of the wetter season · Weather & things to do
Old San Juan in October
Little changes in Old San Juan from September: highs stay near 85°F (30°C), lows near 79°F (26°C), and about 6.3 in (161 mm) of rain falls.
With a comfort score of 55/100 (11th of 12), it's one of the toughest months, held back mainly by cloud cover.
- Avg high
- 85°F (30°C)
- Avg low
- 79°F (26°C)
- Rain
- 6.3 in (161 mm)
- Humidity
- 80%
- Cloud cover
- 67%
- Daylight
- ~11 h 34 min
- Comfort score
- 55/100 · Fair
What October feels like
Highs settle around 85°F (30°C), warm enough for short sleeves.
Even at night it stays warm, around 79°F (26°C).
Humidity averages 80%, so the air feels sticky and the heat feels stronger than the thermometer says.
Rain is a real factor, with about 6.3 in (161 mm) across the month.
Plan around October
October is one of the lower-scoring months here; the best are December – March.
- Inside the wettest three-month stretch, September – November.
- Comfort holds steady from September (53 → 55/100).
- Our Old San Juan & Ponce route is planned for Dec – mid-Jan, a window set by the holiday season rather than the weather — October falls outside it.
What to pack for October
- Light, breathable clothes85°F afternoons
- Quick-dry fabrics80% average humidity
- Rain jacket and waterproof shoes6.3 in of rain on average
- Comfortable walking shoesmost picks involve some walking
What to do in Old San Juan in October
With 6.3 in of rain, these picks lean toward food, drink and places with a roof, with outdoor options when the weather breaks.
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.
Castillo San Felipe del Morro
Six-level Spanish citadel begun in 1539 on the headland guarding San Juan Bay, part of a UNESCO World Heritage Site.
La Factoria
Unsigned cocktail bar of linked rooms on Calle San Sebastian, with salsa dancing late into the night.
Why now A sit-down stop to wait out showers in a month with 6.3 in of rain.
Casa Cortes ChocoBar
Cafe run by the Cortes chocolate family, serving hot chocolate with cheese, chocolate dishes and breakfast.
Why now Easy to slot in when October's rain moves in.
Paseo de la Princesa
Tree-lined 19th-century promenade along the bay under the city walls, ending at the Raices fountain.
Nearby in October
- Ponce in October~46 mi · highs 86°F, 4.4 in rain · similar daytime temperatures, drier
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 October: quick answers
Is October a good time to visit Old San Juan?
It's one of the tougher months here, scoring 55/100, held back mainly by cloud cover. The best months are December – March. Expect highs of 85°F (30°C) and 6.3 in (161 mm) of rain.
How hot is Old San Juan in October?
Average highs are 85°F (30°C) and average lows 79°F (26°C), making it the 5th-warmest month by daytime highs.
Does it rain a lot in Old San Juan in October?
Yes: about 6.3 in (161 mm) of rain falls across October on average, the 2nd-wettest month of the year. The annual total is about 47.5 in (1207 mm).
What should I pack for Old San Juan in October?
Bring light, breathable clothes (85°F afternoons), quick-dry fabrics (80% average humidity), rain jacket and waterproof shoes (6.3 in of rain on average) and comfortable walking shoes (most picks involve some walking).
More on Old San Juan
Planning Old San Juan in October?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.