May · Puerto Rico
Best time to visit San Juan in May Weather, crowds & prices
Weather in San Juan in May
Average temperature 28°C, 140 mm of rain, about 28 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
7.9/10
Ranked #7 of 12 months
- Avg temp
- 28°C
- Rainfall
- 140 mm
- Humidity
- 78%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in San Juan scores 7.9/10 for beach and coastal travel - ranked #7 of 12. Expect around 28°C, 140 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Old San Juan's blue cobbles, fortresses and salsa bars face the Atlantic in Puerto Rico's capital.
May in San Juan: strong conditions, 7th of 12
Days in May average 28°C (82°F) and humidity near 78% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
140 mm of rain makes this a wet month here, though with about 28 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 7.9/10 on the same scale — 7th of 12 months, versus 9.4/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, March is materially better in San Juan — 1.5 points higher on the same scale.
Frequently asked
- What is the weather like in San Juan in May?
- In May, San Juan averages 28°C, 140 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 7.9/10.
- Is May a good time to visit San Juan?
- May earns a 7.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in San Juan in May?
- Expect about 140 mm of rain in May. Average humidity is 78% and there are about 28 days with 6+ hours of sunshine.
Curated in San Juan
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Things to do in San Juan
San Juan, Puerto Rico. Live activities and tours from GetYourGuide, matched to this destination.