Puerto Rico San Juan Weather in August — Climate Guide
August in San Juan is moderate
August is moderate for San Juan.
August is hurricane season peak start. Statistically, the historical peak hurricane strike window for PR is mid-August through September. Travel insurance with full cancellation + interruption coverage absolutely essential. Hotels handle evacuations professionally — 3-5 day advance warning typical for major storms.
Sargassum (brown seaweed) peaks August on east + south coasts; San Juan north-coast beaches less affected but variable. Hotels with dedicated sargassum crews (Condado Vanderbilt, La Concha, Caribe Hilton) maintain cleaner beaches than budget alternatives.
Travel score
Hurricane peak begins + sargassum peak + back-to-school pricing relief
August Weather at a Glance
August averages 90°F / 32°C highs and 75°F / 24°C lows with 12 rainy days and 150mm rainfall. Humidity 79%. UV 11. Sunshine 7 hours. Sea 29°C. Hurricane risk statistically peaks mid-August through September. Sargassum peak for east + south coasts.
August Travel Advice
Travel insurance mandatory. Subscribe to NHC (National Hurricane Center) + PR Conagua hurricane alerts. Identify hotel hurricane evacuation procedures on check-in. Sargassum: book hotels with dedicated cleaning crews. Mid-August (Aug 20+) is sweet spot for pricing + decent weather. Stay attuned to forecast.
Flying In from Overseas
Tourist arrivals soften with hurricane awareness. European summer continues early month. Direct flights from NYC $250-400, Boston $250-400, Toronto $350-600. Hurricane risk = cancellation flexibility critical.
August Pricing Trends
Hurricane shoulder: Condado oceanfront 4-star $150-300/night, La Concha + Condado Vanderbilt $200-500, El Convento $200-400. Mid-month Aug 20+ further -10-15%. Vieques + Culebra -30% from July peak.
San Juan August Weather Stats
Avg High
32°C
Avg Low
24°C
Rainy Days
12
150mm total
Sunshine
7h
Daily avg
Humidity
79%
very-humid
UV Index
11
Extreme
Wind
18 km/h
Gusts 32
Sea Temp
29°C
swimming-warm
Crowds
Moderate
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
22 μg/m³
PM10
38 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
36°C
Nighttime
25°C
Humidity and wind affect how the actual temperature feels.
Wind
18 km/h
Max gust 32 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Mid-August pricing softens (back-to-school)
- Hotels -50% off January peak
- Long daylight + warm sea 29°C
- Less crowded than July
Cons
- Hurricane season peak begins
- Sargassum peak month for east coast
- Daily heavy thunderstorms
- Travel insurance becomes critical
August Events & Festivals
- **Hurricane season peak begins (statistically mid-August onward)**
- **Sargassum peak month for east + south coasts**
- US back-to-school weekend mid-Aug (kids return — pricing drops)
San Juan in August — Full Picture
August is hurricane season peak start. Statistically, the historical peak hurricane strike window for PR is mid-August through September. Travel insurance with full cancellation + interruption coverage absolutely essential. Hotels handle evacuations professionally — 3-5 day advance warning typical for major storms.
Sargassum (brown seaweed) peaks August on east + south coasts; San Juan north-coast beaches less affected but variable. Hotels with dedicated sargassum crews (Condado Vanderbilt, La Concha, Caribe Hilton) maintain cleaner beaches than budget alternatives.
Mid-August: US back-to-school weekend — families return home, hotel pricing softens by Aug 20. Hotel Zone 4-star Condado $150-300 per couple.
What to Wear & What to Pack
Same as July — hot + humid + wet. Quick-dry, SPF 50+, mosquito repellent. Rain jacket essential. Hurricane preparedness: small dry bag for emergency documents + cash.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
30°C
22°C
7.7/mo
Summer (Jun·Jul·Aug)
Current32°C
24°C
11.7/mo
Autumn (Sep·Oct·Nov)
31°C
23.3°C
12.3/mo
Winter (Dec·Jan·Feb)
28°C
21°C
8.3/mo
San Juan Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 21° | 8d·75mm | 7h | 76% | 9 | Very busy | Peak |
| February (Best) | 28° | 21° | 7d·65mm | 8h | 75% | 10 | Very busy | Peak |
| March (Best) | 29° | 21° | 6d·55mm | 8h | 74% | 11 | Very busy | Peak |
| April (Best) | 30° | 22° | 7d·100mm | 8h | 75% | 11 | Busy | Shoulder |
| 31° | 23° | 10d·150mm | 8h | 76% | 12 | Moderate | Shoulder | |
| 32° | 24° | 11d·130mm | 8h | 78% | 12 | Moderate | Shoulder | |
| 32° | 24° | 12d·130mm | 8h | 78% | 12 | Busy | Peak | |
| 32° | 24° | 12d·150mm | 7h | 79% | 11 | Moderate | Shoulder | |
| 32° | 24° | 13d·160mm | 7h | 80% | 10 | Quiet | Low season | |
| 31° | 24° | 13d·165mm | 7h | 80% | 9 | Quiet | Low season | |
| November (Best) | 30° | 22° | 11d·140mm | 7h | 78% | 8 | Moderate | Shoulder |
| December (Best) | 28° | 21° | 10d·110mm | 7h | 77% | 8 | Very busy | Peak |
View Other Months
San Juan August Hotel Picks
Frequently Asked Questions
Is August a good time to visit San Juan?
San Juan in August is moderate. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in San Juan in August?
San Juan August averages a high of 32°C and a low of 24°C.
Does it rain much in San Juan in August?
San Juan August averages 150mm of rainfall over about 12 rainy days.
What should I wear in San Juan in August?
Same as July — hot + humid + wet. Quick-dry, SPF 50+, mosquito repellent. Rain jacket essential. Hurricane preparedness: small dry bag for emergency documents + cash.
What time are sunrise and sunset in San Juan in August?
San Juan August sunrise is 06:10 and sunset is 18:45, with 12h 35min of daylight.
What's the air quality like in San Juan in August?
San Juan August air quality (AQI) averages 55, rated Moderate. PM2.5 averages 22μg/m³.
What activities are recommended in San Juan in August?
In August, San Juan is great for Vieques bio bay (peak warm), Condado morning swim, Bacardí distillery tour.
Is August peak season in San Juan?
San Juan August crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit San Juan
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.