Puerto Rico San Juan Weather in May — Climate Guide
May in San Juan is good
May is good for San Juan.
May is the transition month: sargassum may begin appearing on PR east + south coasts (San Juan north-coast beaches largely unaffected), afternoon thunderstorms become a daily 14:00-17:00 pattern, and Memorial Day Weekend brings US East Coast 3-day-weekend travelers.
First half (May 1-14) mostly dry. Hotel pricing drops -25% from April peak; mid-week pricing $200-400 per couple at Condado 4-star.
Travel score
Memorial Day Weekend + sargassum may begin + hotels -25%
May Weather at a Glance
May averages 88°F / 31°C highs and 74°F / 23°C lows with 10 rainy days and 150mm rainfall. Humidity 76%. UV 12 (extreme — year peak). Sunshine 8 hours. Sea 28°C very warm. Afternoon thunderstorms 14:00-17:00 reliable in second half of month.
May Travel Advice
Memorial Day Weekend (last weekend May): book 6-8 weeks ahead. Sargassum: check forecast (UPR Mayagüez monitoring) before booking east-coast itineraries. San Juan north-coast beaches (Condado, Ocean Park, Isla Verde) largely sargassum-free. Hotel pool + cenote-equivalent (El Yunque waterslides) for afternoons.
Flying In from Overseas
Late spring transition — US summer break begins late May. Memorial Day Weekend US spike. European inbound shoulder. Korean + Japanese low. Direct flights from NYC $300-500, Boston $300-500, Toronto $400-650.
May Pricing Trends
Shoulder pricing returns: Condado oceanfront 4-star $200-400/night, La Concha + Condado Vanderbilt $300-600. Memorial Day Weekend (Sat-Mon) +$50-100 surcharge.
San Juan May Weather Stats
Avg High
31°C
Avg Low
23°C
Rainy Days
10
150mm total
Sunshine
8h
Daily avg
Humidity
76%
humid
UV Index
12
Extreme
Wind
19 km/h
Gusts 34
Sea Temp
28°C
swimming-warm
Crowds
Moderate
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
32 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
35°C
Nighttime
24°C
Humidity and wind affect how the actual temperature feels.
Wind
19 km/h
Max gust 34 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Hotels -25% off April peak
- Sea 28°C warm + visibility still good early month
- Memorial Day Weekend festive
- Pre-hurricane season window
Cons
- UV 12 extreme
- Sargassum may begin on east + south coasts
- Afternoon thunderstorms daily starting
- Heat building toward summer peak
May Events & Festivals
- **Memorial Day Weekend (last weekend May — US 3-day weekend, East Coast spike)**
- Sargassum season may begin (worst June-August)
- Cinco de Mayo (May 5, multicultural with PR Mexican-American community)
San Juan in May — Full Picture
May is the transition month: sargassum may begin appearing on PR east + south coasts (San Juan north-coast beaches largely unaffected), afternoon thunderstorms become a daily 14:00-17:00 pattern, and Memorial Day Weekend brings US East Coast 3-day-weekend travelers.
First half (May 1-14) mostly dry. Hotel pricing drops -25% from April peak; mid-week pricing $200-400 per couple at Condado 4-star.
UV index 12 (extreme — year peak) — sunscreen + hat + sunglasses mandatory all day. Schedule outdoor 7:00-11:00; AC indoors 11:00-16:00; beach evenings.
What to Wear & What to Pack
Hot + humidity rising — quick-dry T-shirt, shorts, swimwear, hat, SPF 50+. Light rain jacket for afternoon storms. Reef-safe sunscreen mandatory.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current30°C
22°C
7.7/mo
Summer (Jun·Jul·Aug)
32°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 May Hotel Picks
Frequently Asked Questions
Is May a good time to visit San Juan?
San Juan in May is good. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in San Juan in May?
San Juan May averages a high of 31°C and a low of 23°C.
Does it rain much in San Juan in May?
San Juan May averages 150mm of rainfall over about 10 rainy days.
What should I wear in San Juan in May?
Hot + humidity rising — quick-dry T-shirt, shorts, swimwear, hat, SPF 50+. Light rain jacket for afternoon storms. Reef-safe sunscreen mandatory.
What time are sunrise and sunset in San Juan in May?
San Juan May sunrise is 05:55 and sunset is 18:40, with 12h 45min of daylight.
What's the air quality like in San Juan in May?
San Juan May air quality (AQI) averages 45, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in San Juan in May?
In May, San Juan is great for El Yunque early-morning hikes, Condado Beach (north-coast sargassum-free), Old San Juan AM walks.
Is May peak season in San Juan?
San Juan May 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.