San Juan Weather in April

🇵🇷 Puerto Rico

31°C

High

24°C

Low

Rain Days

Sunshine

78%

Humidity

North America › 🇵🇷 Puerto Rico › San Juan

Updated: March 2026

Is April a Good Time to Visit San Juan?

3/10

Avoid

April is a avoid time to visit San Juan (3/10). Average highs of 31°C and 6 sunshine hours daily make conditions workable, though not exceptional. April suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 15 potential rain days. May offers a similar profile at lower hotel rates if dates are flexible. Watch out for prolonged rain stretches: with 15 wet days, a fully outdoor itinerary is risky. Build in museum days and covered market visits as contingency. Planning tips: most accommodation categories have availability, and last-minute deals are common. The quieter streets and shorter queues can make this a genuinely enjoyable time to visit for the right type of traveller. Budget-conscious visitors will find the best value of the year in this period.

vs March:30°C avg high

San Juan's April weather is shaped by atmospheric forces that make the data more than just numbers. The 31°C average high reflects the dominance of a stable subtropical air mass, which suppresses cloud formation and concentrates solar energy at the surface. As a result, 6 daily sunshine hours are recorded on average, and rainfall of 175mm is distributed across approximately 15 days because precipitation events tend to be frequent but short-lived.

31°C

Avg High

24°C

Avg Low

15 days

Rain Days

Sunshine

78%

Humidity

Temperature in San Juan in April

The 7°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. At 78% humidity, the 31°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 88°F average high, 75°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in April

Monthly Precipitation (mm)

What to Wear in San Juan in April

Morning24°CBefore the day warms up

Afternoon31°CPeak daytime temperature

Evening27°CAfter sunset cools down

Packing for San Juan in April means dressing for 31°C days and 24°C evenings. A lightweight linen or cotton shirt with loose-fit trousers or a sundress handles the 31°C daytime heat. Evening temperatures settle at 24°C, a modest 7°C drop that a light cardigan or denim jacket covers. For footwear, breathable walking sandals work for casual exploration, but closed-toe trainers are better for uneven surfaces in the historic centre. With 15 rain days expected, a compact travel umbrella is worth the bag space. A waterproof jacket is better than an umbrella if you plan full-day outdoor routes. At 78% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.

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Local tip: San Juan sees heavy rain periods where a compact travel umbrella can feel inadequate. A packable waterproof jacket offers better coverage for prolonged downpours and leaves both hands free for maps and cameras.

Events in San Juan in April

April has no major festivals or public holidays in San Juan, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for San Juan in April

Based on 31°C average highs and 15 rainy days

Lightweight breathable clothing
Linen or bamboo shirts for the hottest hours
Sun hat with a wide brim
UV-protective sunglasses
Hydration bottle (at least 1 litre)
Quick-dry travel towel
Anti-chafe balm for long walking days
Moisture-wicking synthetic fabrics for active days
Compact folding umbrella
Waterproof outer layer or packable rain jacket
Quick-dry clothing that recovers fast after a shower
SPF 30+ sunscreen
Comfortable walking shoes (a second pair lets the first air out overnight)
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in San Juan in April

Early morning walk through San Juan's historic market districtBest before 9amTemperatures are still manageable at 27°C before the midday heat builds
Open-air rooftop dining at sunsetFrom 6pm onwardsThe 31°C daytime heat drops noticeably after sunset, making al fresco dining comfortable
Waterfront promenade or harbour walkEarly morning or after 5pmSea breezes cut through the humidity, making coastal routes the most pleasant in heat
Guided cycling tour of the old quarterFirst tour of the day (7-9am)The low-traffic window before tourist crowds and the cooler morning air make this the prime riding slot
Spend a morning in the national or city art museumOpens at 10am; arrive earlyWith 15 rain days expected, having a full-day indoor plan is practical insurance
Cooking class focused on regional cuisineHalf-day sessions run 10am-1pm or 3-6pmIndoor activity that fills a rainy half-day with genuine cultural content
Visit covered historical sites: cathedral, palace, or bazaarAny time; most crowded middayRoofed monuments and covered markets provide exploration without weather exposure
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningApril brings distinct seasonal changes to public green spaces worth exploring
Seek out chilled local specialities: cold-brew tea, ice desserts, or chilled seafood at street-level stallsAny time; most atmospheric in evening marketsHot-weather street food culture peaks in April, with vendors setting up specifically for warm evenings

Why is San Juan warm in April?

In April, San Juan sits in the dry season corridor, as the ITCZ shifts away from the region and trade winds bring drier, more stable air. This produces reliably sunny days reaching 31°C, with lower humidity than the wet months. Overnight lows of 24°C offer a pleasant reprieve from the midday heat. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: San Juan in April

In April, San Juan experiences average highs of 31°C (88°F) and lows of 24°C (75°F). Expect around 15 rainy days and 6 hours of sunshine per day, with humidity averaging 78%. The 7°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.

San Juan typically sees 15 rainy days in April, with total precipitation of around 175mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in San Juan typically sees 4-6 fewer rain days than April.

Pack lightweight, breathable clothing (linen or cotton), a wide-brim sun hat, SPF 50+ sunscreen, and a refillable water bottle for San Juan in April. The 31°C daytime heat demands sun protection during midday hours, typically 11am to 4pm. A compact travel umbrella is also worth packing, as 15 rainy days means afternoon showers are a real possibility. Quick-dry synthetic fabrics are preferable to cotton in 78% humidity.

April is a reasonable time to visit San Juan. Expect 15 rainy days, so pack a light rain layer for flexibility. Average temperatures of 31°C make outdoor exploration comfortable during the dry periods. With 6 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.

The average high temperature in San Juan in April is 31°C (88°F), and the average low is 24°C (75°F). The mean daily temperature is approximately 28°C (82°F). The day-to-night range of 7°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit San Juan is generally February. February offers the most sunshine at 3 hours per day and only 9 rainy days. Average temperatures reach 29°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around February gives you the best chance of dry, bright weather.

April is shoulder or low season in San Juan, meaning fewer tourists and generally lower prices than peak months. With 6 sunshine hours and 15 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In April, San Juan suits a range of activities thanks to warm temperatures of 31°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. Cosy cafes and cultural venues make ideal retreats on overcast days.

April ranks 4th sunniest of the year in San Juan, with an average 6 daily sunshine hours. The driest months are December, January, and November. May is the hottest month (32°C avg high); January is the coolest (28°C). From here, temperatures rise 1°C into May. Compared to last month (March: 30°C high, 12 rain days), April is warmer and wetter. April sits in the middle of the annual sunshine ranking for San Juan, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	28°C	21°C	7	1h	View
February	29°C	22°C	9	3h	View
March	30°C	23°C	12	4h	View
April	31°C	24°C	15	6h	View
May	32°C	25°C	17	7h	View
June	32°C	25°C	18	7h	View
July	32°C	25°C	17	7h	View
August	31°C	24°C	15	6h	View
September	30°C	23°C	12	4h	View
October	29°C	22°C	9	3h	View
November	28°C	21°C	7	1h	View
December	28°C	21°C	6	1h	View

Other Months in San Juan

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to San Juan

Best Time to Visit San Juan San Juan vs Santo Domingo in April

Data Sources for San Juan

San Juan on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.