April Weather in San Juan, Puerto Rico

Last updated: August 31, 2025

April in San Juan, Puerto Rico offers a delightful blend of warmth and occasional showers, making it an inviting time to experience this vibrant destination. With maximum temperatures reaching 31°C (88°F) and an average of 26°C (78°F), visitors can enjoy the tropical climate. Evenings cool down to a pleasant 22°C (71°F), perfect for beachside strolls. While April sees 10 days of rainfall totaling 56 mm (2.2 in), the lush surroundings benefit from the humidity, which averages 75%, enhancing the island’s natural beauty. Whether soaking up the sun or exploring the rich culture, April provides an ideal backdrop for memorable adventures in San Juan.

April Temperature in San Juan

In April, San Juan, Puerto Rico, welcomes the warmth of spring with temperatures on the rise. With a minimum of 22°C (71°F), an average of 26°C (78°F), and a peak of 31°C (88°F), it's a month that beautifully bridges the cooler months and the hot summer ahead. The trend showcases a slight increase from March, where the maximum temperature peaked at 30°C (86°F), indicating that warmer days are just around the corner. As the weather becomes more vibrant, this is an ideal time to explore the island’s lush landscapes and lively culture, all while soaking up the sun in comfortable, balmy conditions.

April Weather in San Juan: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, April typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec777677788081828282817978
Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in San Juan

April in San Juan, Puerto Rico, sees a notable decrease in precipitation compared to the preceding month, with an average of 56 mm (2.2 in) recorded over 10 days of rainfall. This decline is reflected in the overall trend of spring, as precipitation begins to taper after the wetter months of January through March, which culminates in a significant spike in March. As the island transitions toward the hotter summer months, the anticipation of increased rainfall looms, especially as May approaches with its average of 64 mm (2.5 in). April's weather serves as a gentle bridge, balancing the lingering spring showers with the promise of more substantial summer rains ahead.

April Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In San Juan, April typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec394367566468879917314510651
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Juan

In April, San Juan, Puerto Rico experiences a moderate humidity level of 75%, mirroring the trend established in the previous months of January through March, where humidity steadily averaged between 74% and 76%. This consistency suggests a stable climatic pattern as the region transitions into the warmer months. As May approaches, the humidity remains unchanged at 75%, reflecting a seamless continuation of April’s balmy atmosphere. However, the subsequent months signal a rise in humidity, peaking at 80% in July and August, hinting at the lush, tropical environment that characterizes the summer season. Overall, April serves as a gentle bridge between the cooler months and the upcoming summer's embrace, providing a taste of the tropical warmth to come.

April Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in San Juan is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%74%75%75%77%80%80%79%78%78%76%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Juan

In April, San Juan, Puerto Rico, continues to showcase its sunny disposition with a UV Index soaring at 13, categorized as extreme. This trend of intensifying UV radiation seen from February through April indicates that outdoor enthusiasts should exercise caution, as the burn time remains a brisk 10 minutes. Following the peak of April, May threatens to intensify even further with a UV Index of 14, reinforcing the necessity for sun protection. With consistently high readings throughout the year, from January's UV Index of 9 to June's 13, it's clear that vigilance is key for those soaking in San Juan's abundant sunshine. For more details on daily UV levels, visit San Juan UV Index.

Maximum UV Index Levels in San Juan for April

The chart shows the monthly maximum UV Index (UVI) for San Juan in April, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In April, the maximum UV index in San Juan typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131314131213131298
Data source: San Juan April UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

April Sunshine in San Juan

In April, San Juan, Puerto Rico, basks in a delightful 346 hours of sunshine, maintaining the vibrant trend set in March. As spring unfolds, visitors and locals alike revel in the plentiful daylight that continues through May, which boasts a peak of 356 hours. This sunny spell marks the start of a beautiful pattern, where average sunlight remains generous, ensuring that the warm Caribbean vibe lasts well into the summer months. Interestingly, the sunshine hours remain fairly consistent through June and July, slightly dipping in August before settling into a comfortable rhythm as the year progresses. This delightful array of sunshine makes April a perfect time to explore the rich culture and stunning landscapes of this tropical paradise.

Monthly Sunshine Duration in San Juan: April Highlighted

The April sunshine duration represents the total number of hours San Juan experiences direct sunlight during the month of April, excluding cloudy or obstructed periods. This chart compares the sunshine duration of April with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec257h303h346h346h356h343h353h349h313h313h299h319h
Data source: San Juan April Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Juan During April

In April, the likelihood of sunny weather in San Juan, Puerto Rico, dips to 49%, marking a slight decline from the previous months. This trend follows a peak in February at 70% and a steady range in March at 64%, indicating a shift toward a more variable climate as the island transitions into the warmer months. While April's chances are lower compared to its predecessors, the sunshine is still prominent enough to enjoy outdoor activities. As summer approaches, the likelihood of sunny days decreases significantly, dropping to just 24% by June, suggesting that April is one of the last months to savor ample sunshine before the wetter season sets in.

Percentage of Sunny Days in April in San Juan

The chart illustrates the percentage of sunny days in San Juan throughout the year, with April highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often San Juan experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec51%70%64%49%56%24%43%41%48%49%61%64%
Data source: San Juan April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Juan in April

In April, San Juan, Puerto Rico enjoys a delightful 12 hours of daylight, mirroring the previous month, March. This consistency is a prelude to the longer days that follow, as the island transitions into late spring and summer. The gradual increase in daylight hours, starting from 11 hours in January and February, progresses smoothly, presenting a growing warmth and vibrancy in the atmosphere. As the days lengthen further into June and July, reaching an impressive 13 hours, April serves as a beautiful midpoint where the balance of light fosters outdoor activities and the lively spirit of the island begins to flourish. This trend not only enhances the charm of April but also sets the stage for the sun-soaked adventures that await in the summer months.

Average Daylight Hours in San Juan for April

The chart illustrates the variation in daylight duration in San Juan throughout the year, with April highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 9m11h 32m12h 2m12h 33m12h 59m13h 12m13h 5m12h 42m12h 12m11h 41m11h 15m11h 2m
Data source: San Juan daylight hours, calculated by summing the hours between sunrise and sunset for each day.

April Winds in San Juan

April in San Juan, Puerto Rico, sees a gentle shift in the breeze, with an average wind speed of 3.8 m/s (9 mph). This slight decrease from the previous months, particularly when compared to the brisk 5.2 m/s (12 mph) of February and 4.5 m/s (10 mph) in March, signals the onset of warmer weather as spring transitions into summer. Despite the calming winds, April remains a delightful time to enjoy the vibrant coastal scenery, as the consistent breezes still offer a refreshing touch in the tropical heat. Interestingly, as the year progresses, wind speeds tend to rise again in May and throughout the summer months, showcasing San Juan's dynamic climate that dances between tranquility and spirited gusts.

Average April Wind Speed in San Juan

The chart displays monthly wind speed patterns in San Juan, with values for each month shown alongside April's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how April's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.15.24.53.8 m/s4.44.95.34.63.23.53.74.4
Data source: San Juan April wind data, generated using information from the Copernicus Climate Change Service.

How April Weather in San Juan Compares to Other Months

Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.

In comparing the weather of April and January, April tends to be slightly warmer, with average temperatures reaching 26°C (78°F) compared to January's average of 25°C (77°F). The maximum temperatures in April can peak at 31°C (88°F), while January's highest temperature is a bit cooler at 29°C (85°F). However, April also experiences a higher amount of precipitation, averaging 56 mm (2.2 in) over approximately 10 days, compared to January's 38 mm (1.5 in) spread over 12 days. Humidity levels are comparable, with April at 75% and January slightly higher at 76%. For more detailed information on January weather, you can visit San Juan weather in January.

In comparing April and February weather, April tends to be slightly warmer with average temperatures reaching 26°C (78°F) and maximums of 31°C (88°F), compared to February's average of 25°C (77°F) and maximums of 29°C (85°F). April also experiences higher precipitation at 56 mm (2.2 in) over 10 days, whereas February records 43 mm (1.7 in) across 12 days. Both months maintain a consistent humidity level of 75%. For more detailed insights about February weather, you can visit San Juan weather in February.

When comparing the weather in April to March, we see a slight increase in temperatures. April boasts a minimum temperature of 22°C (71°F), an average of 26°C (78°F), and a maximum of 31°C (88°F), while March's temperatures range from a minimum of 21°C (71°F) to a maximum of 30°C (86°F). In terms of precipitation, April experiences slightly less rainfall, with 56 mm (2.2 in) over 10 days, compared to March's 67 mm (2.6 in) over 14 days. Humidity levels remain relatively stable, hovering around 75% in April and 74% in March. For more detailed insights, you can check San Juan weather in March.

In comparing the weather of April and May, there is a noticeable trend towards slightly warmer temperatures and increased precipitation in May. April boasts a minimum temperature of 22°C (71°F) and an average of 26°C (78°F), while May's temperatures begin at a minimum of 23°C (73°F) and an average of 27°C (80°F). The maximum temperature also rises from April's 31°C (88°F) to May's 32°C (90°F). Additionally, May experiences more rainfall, with 64 mm (2.5 in) over 13 days compared to April's 56 mm (2.2 in) over 10 days. Both months maintain a consistent humidity level of 75%. For a more detailed look at the specific weather patterns, check out San Juan weather in May.

April and June offer warm weather, but there are some notable differences between the two months. In April, temperatures range from a minimum of 22°C (71°F) to a maximum of 31°C (88°F), with an average temperature of 26°C (78°F). The month experiences about 56 mm (2.2 inches) of rainfall over approximately 10 days, and humidity levels sit at around 75%. In contrast, June sees slightly higher temperatures, ranging from a minimum of 24°C (75°F) to a maximum of 32°C (90°F), with an average of 27°C (81°F). Precipitation increases to 68 mm (2.7 inches) spread over 15 days, leading to a marginal rise in humidity to 77%. For more details on June weather, visit San Juan weather in June.

April and July exhibit notable differences in weather patterns in San Juan. In April, temperatures range from a mild 22°C (71°F) at night to a warm 31°C (88°F) during the day, with an average temperature of 26°C (78°F). This month experiences moderate rainfall, totaling 56 mm (2.2 in) over 10 days and a humidity level of 75%. In contrast, July shows slightly higher temperatures, with nighttime lows of 24°C (76°F) and daytime highs reaching 32°C (90°F), averaging 28°C (82°F). Rainfall also increases in July, totaling 87 mm (3.4 in) across 18 days and a higher humidity level of 80%. For a detailed insight into the July climate in San Juan, check out San Juan weather in July.

In comparing the weather between April and August, April experiences slightly lower temperatures, with an average of 26°C (78°F) compared to August's average of 28°C (82°F). While both months exhibit warm conditions, August is characterized by a marginally higher minimum temperature of 24°C (76°F) and maximum temperature of 32°C (90°F). Precipitation levels also rise in August, with 99 mm (3.9 in) of rain falling over 18 days compared to April's 56 mm (2.2 in) over 10 days. This leads to increased humidity in August, which stands at 80%, compared to April's 75%. For more detailed weather information, you can check San Juan weather in August.

April and September present distinct weather profiles, reflecting the transition from spring to early autumn. In April, temperatures range from a minimum of 22°C (71°F) to a maximum of 31°C (88°F), with an average of 26°C (78°F). The month sees about 56 mm (2.2 in) of precipitation over 10 days, accompanied by a humidity level of 75%. In contrast, September experiences slightly warmer temperatures, with a minimum of 24°C (76°F) and a maximum of 32°C (90°F), averaging 28°C (82°F). However, this month is notably wetter, receiving 173 mm (6.8 in) of precipitation over 23 days, and higher humidity at 79%. For more detailed insights into the weather patterns, check San Juan weather in September.

April and October in San Juan present distinct weather patterns. In April, temperatures range from a minimum of 22°C (71°F) to a maximum of 31°C (88°F), with an average of 26°C (78°F); however, the month sees about 56 mm (2.2 in) of precipitation over 10 days, accompanied by a humidity level of 75%. In contrast, October experiences slightly warmer temperatures, with a minimum of 24°C (75°F) and a maximum of 32°C (89°F), averaging around 27°C (81°F). Nevertheless, this month brings significantly higher rainfall, totaling 145 mm (5.7 in) over 22 days, and a marginally higher humidity level of 78%. For more detailed insights, check out San Juan weather in October.

In comparing the weather between April and November, both months exhibit similar average temperatures, hovering around 26°C (78°F). However, April generally experiences slightly lower humidity at 75%, compared to November's 78%. While both months see maximum temperatures reaching up to 31°C (88°F), November tends to be wetter, with 106 mm (4.2 in) of precipitation over 16 days, compared to April's 56 mm (2.2 in) over 10 days. For more detailed information, you can check San Juan weather in November.

In comparing the weather between April and December, both months feature similar average temperatures, maintaining a comfortable range around 26°C (78°F). However, April sees a slightly lower minimum temperature of 22°C (71°F) compared to December's minimum of 23°C (73°F). While the maximum temperatures are quite close, April experiences a bit more rainfall, with 56 mm (2.2 in) over 10 days, contrasted with December’s 51 mm (2.0 in) over 16 days, indicating that the latter month is slightly wetter with more frequent, albeit lighter, precipitation. Humidity levels are comparable, hovering around 75% in April and 76% in December. For more detailed insights about December weather, you can check San Juan weather in December.

Compare San Juan's Climate with Cities Worldwide

Conclusion: What to Expect From April Weather in San Juan

In April, San Juan experiences a delightful blend of warmth and humidity that marks a transition from the cooler months to the vibrant summer ahead. With average temperatures hovering around a pleasant 26°C (78°F), this month offers a nice balance—days are comfortably warm, yet the evenings remain refreshingly mild. While April does see some rain, with about 10 days experiencing precipitation, the overall atmosphere remains lively and inviting. This makes it an ideal time for outdoor activities, unlike the hotter, rainier months that follow. To explore more about the unique weather patterns throughout the year, check out San Juan Climate.