Last updated: August 31, 2025
May in San Juan, Puerto Rico sees a vibrant blend of warm temperatures and refreshing tropical showers. The maximum temperature reaches a sizzling 32°C (90°F), while the average settles at a comfortable 27°C (80°F), making it an ideal time for beach outings. However, evenings cool down to a pleasant 23°C (73°F). With an average precipitation amount of 64 mm (2.5 in) over 13 days, brief rain showers are common, contributing to the 75% humidity that characterizes this lush Caribbean destination. Embrace the warmth and occasional rain as you explore the rich culture and stunning landscapes of San Juan this May!
As May unfolds in San Juan, Puerto Rico, temperatures rise, signaling the approach of summer. The month greets visitors with a minimum temperature of 23°C (73°F), gradually climbing to an average of 27°C (80°F) and peaking at a maximum of 32°C (90°F). This trend of increasing warmth is consistent as the year progresses, with May marking a notable transition from the milder conditions of April. As the weather warms, the vibrant energy of the island comes alive, inviting everyone to enjoy its beautiful beaches and lively streets under the sun-drenched skies. Expect warm, tropical days that set the tone for summer's arrival, perfect for exploring all that this enchanting destination has to offer.
In May, San Juan, Puerto Rico, experiences a significant uptick in precipitation, with an average of 64 mm (2.5 in) over approximately 13 rainy days. This marks a continuation of the wet season, as rainfall amounts gradually increase from earlier months like April's 56 mm and March's 67 mm. The trend suggests a steady escalation towards the peak rainy months ahead, with June and July forecasted to bring even heavier downpours. As the landscape transforms into lush greenery, May serves as a transitional phase, setting the stage for the vibrant, rain-soaked summer ahead.
May in San Juan, Puerto Rico, experiences a steady humidity level of 75%, reflecting a trend of consistency that begins in the cooler months and persists into the warm season. This slight drop from the 76% in January and 75% in April signals the onset of summer, yet the humidity remains comfortably moderate compared to the more pronounced increases seen in the following months, with July and August soaring to 80%. The temperatures may rise, but May's stable humidity offers a pleasant balance, making it an enjoyable time to soak in the vibrant local culture before the summer heat sets in.
In May, San Juan, Puerto Rico, experiences one of its highest UV indices of the year, peaking at 14 under the extreme exposure category. With a burn time of just 10 minutes, visitors and locals alike must be especially cautious when enjoying the island's beautiful beaches and outdoor activities. This trend of escalating UV exposure begins in February and reaches its zenith in May, highlighting the importance of sun protection throughout the spring months. As the summer approaches, the UV index remains consistently high, making it essential to stay vigilant against harmful rays. For more details, check out San Juan UV Index.
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May shines brightly in San Juan, Puerto Rico, as it welcomes 356 hours of sunshine, marking it as the sunniest month of the year. This vibrant burst of sunlight follows a spring peak, where both March and April also boast impressive totals of 346 hours. Transitioning into summer, the sunshine remains robust, with June not far behind at 343 hours. Overall, the data illustrates a delightful upward trend from the winter months, starting with 257 hours in January and climbing steadily, creating an inviting atmosphere that entices locals and visitors alike to bask in the warm Puerto Rican sun.
In San Juan, Puerto Rico, May brings a promising 56% chance of sunny weather, marking a slight uptick from April's 49%. This month continues the trend of fluctuating sunshine, following a notably bright February at 70% and March at 64%. Although May doesn't quite reach those heights, it stands out amidst the cooler months of late winter and early spring, providing a pleasant climate for outdoor activities. As the summer approaches, the likelihood of sunny days dips sharply in June, emphasizing May's role as a transitional month where the sun starts to reclaim its dominance. Overall, while May isn't the sunniest month, it certainly offers a welcoming balance of bright days as the island gears up for the summer heat.
In San Juan, Puerto Rico, the month of May offers a delightful continuation of spring with 12 hours of daylight, a balance that mirrors the previous months of March and April. As the year progresses, daylight hours reach their peak in June and July with 13 hours, providing ample sunshine for outdoor activities. The trend shows a gradual increase from January to April, where daylight starts at 11 hours and climbs to a comfortable 12 hours by May. Following the summer months, light decreases once more, returning to 11 hours by October through December, creating a rhythmic pattern that highlights the island's tropical climate.
In May, the winds of San Juan, Puerto Rico, offer a pleasant breeze with an average speed of 4.4 m/s (10 mph), perfectly complementing the warm weather. This month marks a slight increase from April's calmer 3.8 m/s (9 mph), setting the stage for the breezier months ahead. As we transition into June, wind speeds rise to 4.9 m/s (11 mph), and continue to peak in July with 5.3 m/s (12 mph). This upward trend indicates that May serves as a gentle prelude to the more robust gusts of summer, making it an ideal time for outdoor activities while enjoying the inviting tropical atmosphere. As the year progresses, the variability in wind speeds also hints at the dynamic weather patterns that characterize Puerto Rico, ensuring that each month presents its unique charm.
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
May typically experiences warmer temperatures compared to January, with daily averages reaching up to 27°C (80°F) and highs often soaring to 32°C (90°F). In contrast, January's temperatures are slightly cooler, averaging 25°C (77°F) with maximums of 29°C (85°F). While both months see a similar number of rainy days—May registering 13 and January 12—May brings more precipitation overall, totaling 64 mm (2.5 in) compared to January's 38 mm (1.5 in). Humidity levels remain relatively high in both months, with May at 75% and January at 76%. For more details on January's weather patterns, you can check out San Juan weather in January.
May weather is generally warmer than February, with average temperatures reaching 27°C (80°F) compared to February's 25°C (77°F). While both months have similar humidity levels at 75%, May experiences slightly higher maximum temperatures, peaking at 32°C (90°F) versus February's 29°C (85°F). In terms of precipitation, May sees more rainfall, with 64 mm (2.5 in) over 13 days, compared to February's 43 mm (1.7 in) over 12 days. For a detailed overview of February weather, visit San Juan weather in February.
In comparing the weather between March and May, we see a slight increase in temperatures during May. While March has a minimum temperature of 21°C (71°F) and an average of 25°C (77°F), May experiences a minimum of 23°C (73°F) and an average of 27°C (80°F). The maximum temperatures also rise slightly, from 30°C (86°F) in March to 32°C (90°F) in May. Precipitation levels are relatively similar, with March receiving 67 mm (2.6 in) over 14 days and May totaling 64 mm (2.5 in) across 13 days. Both months feature high humidity, although May sees a marginal increase to 75% compared to March's 74%. For a closer look at March weather specifics, visit San Juan weather in March.
In comparing the weather of May and April, both months exhibit warm temperatures and high humidity levels, typical of tropical climates. May sees a slight increase in average temperature, with a minimum of 23°C (73°F) and a maximum of 32°C (90°F), compared to April's minimum of 22°C (71°F) and maximum of 31°C (88°F). Additionally, May experiences a bit more precipitation, totaling 64 mm (2.5 in) over 13 days, whereas April has 56 mm (2.2 in) spread across 10 days. Interestingly, the humidity remains consistent at 75% for both months, creating a similarly muggy atmosphere. For a more detailed look at April's weather, you can visit San Juan weather in April.
In May, the weather features a minimum temperature of 23°C (73°F) and an average of 27°C (80°F), peaking at a maximum of 32°C (90°F). The month brings about 64 mm (2.5 in) of precipitation over 13 days, with humidity levels averaging around 75%. In comparison, June experiences slightly warmer conditions with a minimum of 24°C (75°F) and the same average and maximum temperatures as May. However, June sees an increase in precipitation to 68 mm (2.7 in) spread over 15 days, along with a slight rise in humidity to 77%. For more details on June weather, visit San Juan weather in June.
When comparing the weather in May and July, both months showcase warm temperatures, but July tends to be slightly warmer. In May, temperatures range from a minimum of 23°C (73°F) to a maximum of 32°C (90°F), with an average temperature of 27°C (80°F). In contrast, July has a minimum temperature of 24°C (76°F), an average of 28°C (82°F), and retains the same maximum temperature of 32°C (90°F).
In terms of precipitation, July experiences more rain, with a total of 87 mm (3.4 in) over 18 days compared to May's 64 mm (2.5 in) over 13 days. Additionally, humidity levels are slightly higher in July at 80%, compared to May's 75%. For a more detailed overview of July's weather, you can visit San Juan weather in July.
In comparing the weather of May and August, we notice that both months share a maximum temperature of 32°C (90°F), but August tends to be slightly warmer overall with an average temperature of 28°C (82°F) compared to May's 27°C (80°F). Additionally, August has a marginally higher minimum temperature of 24°C (76°F), indicating it may feel a bit warmer at night. However, August also brings increased precipitation, totaling 99 mm (3.9 in) over 18 days, whereas May experiences 64 mm (2.5 in) over 13 days. This results in a higher humidity level in August at 80%, compared to 75% in May. For more detailed insights, you can check San Juan weather in August.
In comparing the weather of May and September, both months exhibit warm temperatures with maximums reaching up to 32°C (90°F). However, May tends to be slightly cooler, with average temperatures around 27°C (80°F) compared to September's higher average of 28°C (82°F). May also experiences less rainfall, with 64 mm (2.5 in) of precipitation over 13 days, whereas September sees a significant increase, totaling 173 mm (6.8 in) over 23 days. Additionally, humidity is slightly higher in September at 79% compared to May's 75%. For a more detailed look at September weather, check out San Juan weather in September.
The weather in May is characterized by warm temperatures, with a minimum of 23°C (73°F), an average of 27°C (80°F), and a maximum reaching 32°C (90°F). In terms of precipitation, May sees about 64 mm (2.5 in) over approximately 13 days, with humidity levels around 75%. Conversely, October has slightly warmer minimum temperatures at 24°C (75°F), maintaining the same average of 27°C (81°F) and a maximum of 32°C (89°F). However, October experiences significantly more rainfall, totaling 145 mm (5.7 in) over about 22 days, and a slightly higher humidity of 78%. For more details, you can check the weather specifics here: San Juan weather in October.
In May, the weather is characterized by warm temperatures, with a minimum of 23°C (73°F) and an average of 27°C (80°F), peaking at 32°C (90°F). This month experiences around 64 mm (2.5 in) of precipitation over approximately 13 days, and humidity levels hover around 75%.
In contrast, November shows slightly cooler average temperatures, with a minimum of 23°C (74°F) and a maximum of 31°C (87°F), averaging 26°C (80°F). However, it sees increased precipitation at 106 mm (4.2 in) over about 16 days, accompanied by a slightly higher humidity level of 78%.
For more detailed information on the weather during this month, visit San Juan weather in November.
When comparing the weather in May and December, both months exhibit warm temperatures, with May slightly warmer on average. In May, temperatures range from a minimum of 23°C (73°F) to a maximum of 32°C (90°F), resulting in an average of 27°C (80°F). Conversely, December sees slightly lower temperatures, with a minimum of 23°C (73°F), an average of 26°C (78°F), and a maximum of 31°C (87°F). Precipitation is a notable factor; May experiences more rain, with 64 mm (2.5 in) spread over 13 days, while December has 51 mm (2.0 in) over 16 days. Humidity remains consistent, hovering around 75% in May and 76% in December. For more detailed information, you can check out San Juan weather in December.
May in San Juan brings a noticeable shift in weather patterns, as temperatures rise to a warm and inviting average of 27°C. While still enjoyable, this month often experiences more frequent rainfall, with about 13 days of precipitation, making it one of the wetter months of the year. The humidity levels can feel quite high at 75%, adding a tropical warmth that contrasts with the cooler and drier months preceding it. As you plan your adventures, be sure to embrace the vibrant atmosphere that May offers, while staying prepared for the refreshing tropical showers. For a deeper dive into the climate of this beautiful destination, check out San Juan Climate.