August · Puerto Rico
Best time to visit San Juan in August Weather, crowds & prices
Weather in San Juan in August
Average temperature 29°C, 147 mm of rain, about 28 days with 6+ hours of sunshine and 80% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
7.8/10
Ranked #8 of 12 months
- Avg temp
- 29°C
- Rainfall
- 147 mm
- Humidity
- 80%
- Days with 6h+ sun
- 28
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
August in San Juan scores 7.8/10 for beach and coastal travel - ranked #8 of 12. Expect around 29°C, 147 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.
August in San Juan — reliably good (8th best month)
Days in August average 29°C (84°F) and humidity near 80% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
147 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 7.8/10 on the same scale — 8th 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 — 1.6 points higher on the same scale.
Frequently asked
- What is the weather like in San Juan in August?
- In August, San Juan averages 29°C, 147 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 7.8/10.
- Is August a good time to visit San Juan?
- August earns a 7.8/10 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 August?
- Expect about 147 mm of rain in August. Average humidity is 80% and there are about 28 days with 6+ hours of sunshine.
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San Juan, Puerto Rico. Live activities and tours from GetYourGuide, matched to this destination.