Last updated: August 21, 2025
May in Rio San Juan, Dominican Republic offers a tropical experience characterized by warm temperatures and a vibrant atmosphere. With maximum temperatures reaching 30°C (86°F) and an average of 26°C (79°F), visitors can expect warm, pleasant days, although nights cool down to a comfortable 22°C (72°F). Rainfall is a notable aspect this month, with an average precipitation of 81 mm (3.2 in) falling over 19 days, contributing to the region's lush landscapes. Humidity levels hover around 57%, providing a refreshing tropical vibe that enhances the island's natural beauty, making it an ideal time for both exploration and relaxation.
In May, Rio San Juan welcomes the onset of warmer temperatures, with minimums climbing to a comfortable 22°C (72°F) and averages reaching 26°C (79°F). This month marks a noticeable increase as it transitions to hotter summer months—maximum temperatures hit 30°C (86°F), a significant jump from the earlier months of the year. As spring gives way to summer, the days lengthen and the atmosphere buzzes with life, inviting visitors to embrace the vibrant outdoor activities nestled among the stunning natural beauty of the Dominican Republic. With these pleasant temperatures, May creates the perfect backdrop for both relaxation and adventure.
In May, Rio San Juan experiences a noticeable uptick in rainfall, recording 81 mm (3.2 in) of precipitation over 19 days. This amount marks a slight increase from both April’s totals of 68 mm (2.7 in) and a return to the wetter patterns seen in March. As the region transitions into the heart of the rainy season, the frequency of rain is evident; May's 19 rainy days contribute to the lush, vibrant landscapes typical of this tropical paradise. Following May, the precipitation generally continues to rise, peaking in September with an impressive 145 mm (5.7 in), underlining the distinctive seasonal patterns that define Rio San Juan's climate.
In May, humidity in Rio San Juan, Dominican Republic settles at a comfortable 57%, marking a continuation of the downward trend observed since the peaks of January and February, when levels hovered around 65% and 63%, respectively. This dip in moisture sets the stage for more enjoyable outdoor experiences as spring transitions to summer. Following May, humidity levels remain steady in June before increasing again, reaching their annual highs in the latter months, particularly in August and September, where the levels surge to 71% and 73%. The gradual shift toward higher humidity after May emphasizes the region's tropical climate, balancing the refreshing breezes with the impending warmth typical of the Caribbean summer.
As May rolls into Rio San Juan, the UV Index remains a steadfast 13, placing it in the extreme exposure category. This trend of elevated UV levels started in January and continues through the summer months, with burn times consistently capped at just 10 minutes for unprotected skin. The intensity peaks in March, April, and May before slightly easing in June, suggesting a pattern of sustained sun exposure that demands attention. With this knowledge, locals and visitors alike should prioritize sun safety and protection, keeping in mind that the sun's rays are particularly fierce during this time. For more information on daily UV ratings, check out Rio San Juan UV Index.
UV Risk Categories
In Rio San Juan, Dominican Republic, May marks a delightful peak in sunshine as the days continue to grow brighter and longer. With approximately 346 hours of sunshine, this month is a radiant precursor to the summer, seamlessly flowing from the already generous hours of 343 in April. The trend only intensifies as the region approaches its sunniest months, with June and July boasting even more hours of golden rays. This steady increase in sunlight from January's 251 hours to May's impressive totals signals a vibrant tropical climate that welcomes visitors seeking warmth and adventure. With its sun-kissed shores and inviting atmosphere, May offers an ideal time for exploration and relaxation in this picturesque Caribbean locale.
In May, Rio San Juan enjoys a respectable 57% chance of sunny weather, marking a slight increase from the preceding months of April's 56% but a notable drop compared to February's peak of 67%. This trend showcases a transition from the higher probabilities of sunshine in early spring to a more variable climate as summer approaches, where June sees a significant dip to 37%. As the region prepares for the balmy embrace of summer, May stands out as a time when sun-seekers can still relish ample opportunities for outdoor adventures under the warm Dominican sun.
As May arrives in Rio San Juan, the days grow notably brighter, with daylight extending to 13 hours—the most sunlight the region enjoys since the onset of the year. This gradual increase, beginning in March with 12 hours, showcases a consistent trend of lengthening days as the year progresses toward summer. Following May, the daylight hours remain at a peak of 13 hours through June and July, before gently tapering off in August to 12 hours. The shift from longer to shorter days creates a rhythmic pattern, where the warmth of summer is beautifully balanced with the cooler months, reminding residents and visitors alike of the tropical charm that defines this vibrant locale throughout the year.
In May, the winds in Rio San Juan maintain a pleasant average speed of 5.3 m/s (12 mph), consistent with the gentle breezes that have characterized the preceding months. This stability suggests a smooth transition into the summer, where the wind begins to pick up slightly in June. Looking back, February stands out with the highest average at 6.4 m/s (14 mph), while the late summer months show a subtle decline, with September recording the lowest at 3.8 m/s (8 mph). Overall, May provides an ideal setting—offering just enough breeze to keep the tropical heat at bay while inviting outdoor activities along the stunning coastline.
Weather in Rio San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Rio San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between May and January, both months exhibit warm temperatures, though May tends to be slightly warmer overall. In May, the minimum temperature is 22°C (72°F) with an average of 26°C (79°F) and a maximum of 30°C (86°F), while January starts at a minimum of 21°C (71°F), averages 25°C (77°F), and peaks at 28°C (82°F). Additionally, May experiences more rainfall, with 81 mm (3.2 in) over 19 days, compared to January's 66 mm (2.6 in) across 15 days. Interestingly, January has a higher humidity level at 65%, compared to May's 57%. For more detailed information, check out Rio San Juan weather in January.
May typically features warmer temperatures than February, with averages peaking at around 26°C (79°F) compared to February’s 25°C (76°F). The maximum temperatures in May can reach up to 30°C (86°F), while February sees a maximum of 28°C (83°F). In terms of precipitation, May experiences slightly more rain, with 81 mm (3.2 in) over 19 days, compared to February's 70 mm (2.7 in) over 20 days. Additionally, humidity levels are generally lower in May at 57%, compared to 63% in February, making May feel a bit more comfortable. For a detailed look at February's climatic conditions, you can check Rio San Juan weather in February.
In comparing the weather between March and May, both months exhibit mild temperatures, with March showing slightly cooler averages. March's minimum temperature is 21°C (71°F), while May has a slightly higher minimum of 22°C (72°F). The average temperature in March is 25°C (76°F) compared to May's 26°C (79°F), and while May reaches a maximum of 30°C (86°F), March peaks at a comfortable 28°C (83°F). Precipitation levels are notably different, with March experiencing more rainfall at 112 mm (4.4 in) over 18 days, which is higher than May's 81 mm (3.2 in) spread over 19 days. Humidity levels are similar, with March at 59% and May slightly lower at 57%. For more detailed insights about March weather in this region, you can visit Rio San Juan weather in March.
In comparing the weather of May and April, it's evident that May experiences slightly warmer temperatures, with average highs reaching 30°C (86°F) compared to April's maximum of 29°C (84°F). Both months start with similar minimum temperatures of 22°C (72°F), but May’s average temperature is a bit higher at 26°C (79°F) versus April's 25°C (78°F). Precipitation is also a bit more frequent in May, with 81 mm (3.2 in) of rain over 19 days, while April sees 68 mm (2.7 in) across 17 days. Humidity remains relatively stable, with May at 57% and April at 58%. For more detailed information on April's weather, you can visit Rio San Juan weather in April.
May and June in Rio San Juan present inviting weather patterns, though with some notable differences. In May, temperatures range from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), with an average of 26°C (79°F). Precipitation is relatively high, totaling 81 mm (3.2 in) over 19 days, contributing to a moderate humidity level of 57%. In contrast, June sees slightly warmer temperatures, with a minimum of 24°C (76°F) and an average of 27°C (81°F), though the maximum drops slightly to 29°C (85°F). Rainfall decreases to 60 mm (2.4 in) over the same number of days, maintaining the humidity at 57%. Overall, June offers a slightly warmer and drier experience compared to May. For more details, check Rio San Juan weather in June.
In comparing the weather between May and July, we see a slight increase in temperature and humidity during July. May features average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F) and receives 81 mm (3.2 inches) of precipitation over 19 days with 57% humidity. In contrast, July has a minimum temperature of 24°C (76°F) and an average of 27°C (81°F), reaching a maximum of 30°C (87°F). Additionally, July experiences heavier rainfall, totaling 103 mm (4.1 inches) over 23 days, with humidity increasing to 63%. For more detailed information, you can check the Rio San Juan weather in July.
In comparing the weather patterns of May and August, we notice a slight increase in temperature and humidity levels. In May, temperatures range from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), with an average of 26°C (79°F). In contrast, August sees a slightly warmer minimum of 24°C (76°F) and a maximum of 31°C (88°F), with an average of 27°C (82°F). Precipitation also rises from 81 mm (3.2 in) over 19 days in May to 99 mm (3.9 in) across 22 days in August, contributing to a noticeable increase in humidity from 57% to 71%. For a more detailed look at August conditions, you can check Rio San Juan weather in August.
In May, the weather tends to be quite warm, with temperatures ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), averaging around 26°C (79°F). Although it does experience some precipitation, with about 81 mm (3.2 in) over 19 days, the humidity is relatively moderate at 57%.
By September, the weather remains warm but is slightly hotter, with minimum temperatures of 24°C (76°F) and maximums soaring up to 31°C (88°F), averaging 27°C (82°F). However, September is notably wetter, receiving about 145 mm (5.7 in) of rain over 20 days, and humidity increases to 73%. For more detailed weather specifics, you can check out Rio San Juan weather in September.
May and October showcase warm weather, but they do have notable differences. In May, temperatures range from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), with an average of 26°C (79°F). The month sees about 81 mm (3.2 in) of precipitation over 19 days, accompanied by a humidity level of 57%. Conversely, October has a slightly warmer temperature range, with a minimum of 24°C (76°F) and an average of 27°C (81°F), peaking at 30°C (87°F). However, it also experiences increased rainfall, with 102 mm (4.0 in) of precipitation over 22 days and higher humidity at 72%. For more detailed information, you can check Rio San Juan weather in October.
May and November exhibit similar average temperatures, ranging from a minimum of 22°C (72°F) to a maximum of 30°C (86°F), with May offering slightly cooler mornings. However, November tends to be more humid, with humidity levels rising to 72% compared to May's 57%. Precipitation is also higher in November, with 110 mm (4.3 in) over 21 days, while May experiences 81 mm (3.2 in) across 19 days. This increased rainfall and humidity in November can lead to a more tropical feel. For more details on the weather conditions in November, you can visit Rio San Juan weather in November.
May and December exhibit similar warm temperatures, with average highs reaching 30°C (86°F) in May and slightly lower at 29°C (85°F) in December. However, December tends to be more humid, with a humidity level of 69% compared to May's 57%. Both months see comparable levels of precipitation, with May receiving 81 mm (3.2 in) over 19 days and December totaling 83 mm (3.3 in) over 22 days. For detailed insights into December weather, you can visit Rio San Juan weather in December.
As May arrives in Rio San Juan, the weather showcases a delightful blend of warmth and moisture. With temperatures rising to a pleasant 30°C (86°F), it marks a gradual transition from the cooler months. Unlike the drier spells earlier in the year, May brings increased humidity and an uptick in precipitation, with rain making its appearance on nearly two-thirds of the days. This shift fosters a vibrant lushness across the landscape, setting the stage for the lush green that characterizes the region. For those looking to understand the full climate experience, check out the detailed insights at Rio San Juan Climate.