A wetter month · Weather & things to do
Old San Juan in May
Little changes in Old San Juan from April: highs stay near 85°F (29°C), lows near 77°F (25°C), and about 5.1 in (129 mm) of rain falls.
Our comfort score puts it mid-table at 60/100, 9th of 12.
- Avg high
- 85°F (29°C)
- Avg low
- 77°F (25°C)
- Rain
- 5.1 in (129 mm)
- Humidity
- 77%
- Cloud cover
- 74%
- Daylight
- ~12 h 52 min
- Comfort score
- 60/100 · Good
What May feels like
Days are warm, averaging 85°F (29°C).
Nights stay warm too, with lows averaging 77°F (25°C).
With 77% average humidity, it feels muggy.
Expect regular rain: about 5.1 in (129 mm) falls in the month.
Plan around May
May sits mid-table; the best months are December – March.
- Humidity season begins: 77% on average, up from 74% in April.
- Comfort slips from 73/100 in April to 60/100.
- Our Old San Juan & Ponce route is planned for Dec – mid-Jan, a window set by the holiday season rather than the weather — May falls outside it.
What to pack for May
- Light, breathable clotheshighs average 85°F
- Sunscreen, sunglasses and a hatstrong sun this month
- Quick-dry fabrics77% average humidity
- Rain jacket and waterproof shoesfrequent rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Old San Juan in May
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
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 5.1 in of rain.
Castillo San Cristobal
The largest Spanish fort in the Americas, completed in 1783, guarding the land approach to the old city.
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 May's rain moves in.
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.
Paseo de la Princesa
Tree-lined 19th-century promenade along the bay under the city walls, ending at the Raices fountain.
Nearby in May
- Ponce in May~46 mi · highs 86°F, 3.5 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 May: quick answers
Is May a good time to visit Old San Juan?
It's middling, scoring 60/100. The best months are December – March, at up to 82. Expect highs of 85°F (29°C) and 5.1 in (129 mm) of rain.
How hot is Old San Juan in May?
Average highs are 85°F (29°C) and average lows 77°F (25°C), making it the 6th-warmest month by daytime highs.
Does it rain a lot in Old San Juan in May?
Yes: about 5.1 in (129 mm) of rain falls across May on average, the 5th-wettest month of the year. The annual total is about 47.5 in (1207 mm).
What should I pack for Old San Juan in May?
Bring light, breathable clothes (highs average 85°F), sunscreen, sunglasses and a hat (strong sun this month), quick-dry fabrics (77% average humidity), rain jacket and waterproof shoes (frequent rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Old San Juan
Planning Old San Juan in May?
Share this May plan with your group, poll everyone on dates and keep the packing list in one place.