San Juan is warm and showery all year, so the weather is easy to dress for. The packing problem is the ground: Old San Juan is paved with blue cobblestones called adoquines that are uneven and slick when wet, and El Yunque adds muddy rainforest trails.
San Juan weather by month
Daily high and low (°F), and days with rainSee the numbers
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High | 84°F29°C | 84°F29°C | 86°F30°C | 86°F30°C | 88°F31°C | 91°F33°C | 90°F32°C | 90°F32°C | 91°F33°C | 90°F32°C | 88°F31°C | 84°F29°C |
| Low | 73°F23°C | 73°F23°C | 73°F23°C | 75°F24°C | 77°F25°C | 79°F26°C | 79°F26°C | 81°F27°C | 79°F26°C | 79°F26°C | 77°F25°C | 75°F24°C |
| Rain days | 18 | 16 | 13 | 19 | 16 | 16 | 17 | 15 | 16 | 14 | 16 | 20 |
Season by season
Winter
December–MarchThe mildest months. Highs run 84–86°F (29–30°C) with lows of 73–75°F (23–24°C). December is the wettest month of the year at 20 rain days, and January averages 18, but showers pass quickly. Pack light clothes, a packable rain jacket and shoes that grip.
Spring
April–MayWarmer and still showery. April averages a 86°F (30°C) high and 19 rain days, May a 88°F (31°C) high and 16. Bring sun protection, a refillable bottle and a quick-dry change for El Yunque.
Summer and hurricane season
June–NovemberHot and humid. Highs reach 91°F (33°C) in June and September, with lows of 77–81°F (25–27°C) and 14–17 rain days a month. This is hurricane season. Pack breathable clothes, a fan and a waterproof cube for your phone and papers.
What to bring to San Juan
0 of 22 packed- Allbirds Men's Tree Dasher 2Footwear & Shoe Care
Grippy, light sneakers handle the uneven blue cobblestones of Old San Juan.
- Allbirds Women's Tree Dasher 2Footwear & Shoe Care
A breathable sneaker for long days on Old San Juan's slick adoquines.
With 14–20 rain days every month, a rain jacket earns its space, especially in El Yunque.
El Yunque trails are wet often, and a real rain shell keeps you dry between showers.
- Nite Ize RunOff Waterproof Packing CubeBags & Luggage
Keeps your phone and documents dry in sudden showers and at the beach.
- Sawyer 20% Picaridin Insect Repellent Lotion, 4 ozHealth & Safety
Picaridin keeps mosquitoes off on rainforest trails and humid evenings.
- Hydro Flask 24 oz Wide Mouth Bottle with Flex Straw CapWater Bottles & Hydration
Highs of 84–91°F (29–33°C) year-round mean you will refill this often.
Clothing
- Breathable shorts and tops · 5 setsHighs of 29–33°C all year
- Quick-dry clothes · 2 setsWet El Yunque trails
- Swimwear · 2
- Smart-casual evening outfit · 1Evening restaurants lean smart casual
- Beach cover-up · 1
Footwear
- Sandals · 1 pairBeach days
- Trail shoes you can get muddy · 1 pairEl Yunque trails are often wet
Gear
- Compact umbrella · 1December has 20 rain days
- Wide-brim sun hat · 1
- Sunglasses · 1
Health and toiletries
- Reef-safe sunscreen · 1
- Anti-chafe balm · 1Hot, humid walking days
Documents and money
- ID or passport · 1US citizens need no passport from the mainland
- Travel insurance · 1Hurricane season runs June–November
Tech
- Plug adapter (non-US visitors) · 1Type A and B sockets at 120V
What shoes should you pack for San Juan?
Sneakers with real grip. The blue adoquines in Old San Juan are rounded and uneven, and they get slippery after rain. Add sandals for the beach, and wear closed shoes with traction for El Yunque trails.
What do people wear in San Juan?
Casual summer clothes. Shorts and sundresses are normal in Old San Juan and Condado. Restaurants in the evening lean smart casual. Cover swimwear when you leave the beach.
What should you pack for El Yunque?
Rain gear and shoes you can get muddy. El Yunque is a rainforest, so trails are often wet even when San Juan is dry. Bring a light rain jacket, quick-dry clothes, insect repellent and water.
What plugs does San Juan use?
Puerto Rico uses Type A and B sockets at 120V. US and Canadian plugs fit without an adapter. UK, EU and Australian visitors need an adapter; most phone and laptop chargers handle the voltage fine.
Tours and things to do in San Juan
Packed and ready? Browse guided tours, day trips and tickets for San Juan.
What should you leave at home for San Juan?
Heels, heavy jeans and warm jackets. Lows never drop below 73°F (23°C), and heels wedge between cobblestones. US citizens need no passport to fly in from the mainland.
Packing for San Juan: questions people ask
What should I wear in San Juan in December?
Light clothes and a rain jacket. December averages a 84°F (29°C) high, a 75°F (24°C) low and 20 rain days, the most of the year.
Is Old San Juan walkable?
Yes, but the blue cobblestones are uneven and slick when wet. Wear sneakers with grip.
Do I need rain gear for El Yunque?
Yes. It is a rainforest, and trails are often wet. A light rain jacket and quick-dry clothes work best.
What is the hottest month in San Juan?
June and September, each with a 91°F (33°C) average high.
Do I need an adapter in Puerto Rico?
Not from the US. Sockets are Type A and B at 120V, the same as the mainland.
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