Last updated: January 18, 2025
Guayanilla, Puerto Rico, is characterized by a tropical monsoon climate, classified as Köppen-Geiger Am. Throughout the year, the region experiences an average temperature of 25°C (78°F), with minimum temperatures dropping to 18°C (65°F) in January and peaking at 31°C (89°F) in August. This climate profile underscores the warm and humid conditions typical of coastal areas in the Caribbean, making Guayanilla a vibrant environment that supports diverse ecosystems and influences local lifestyles.
In Guayanilla, Puerto Rico, temperature patterns exhibit a warm tropical climate with subtle seasonal variations. The year begins with cooler temperatures in January, where averages hover around 24°C (76°F), gradually rising through the months. February and March maintain similar averages, but by April, temperatures increase slightly to 25°C (76°F). The transition into summer is marked by a notable spike in warmth during June and July, where both average and maximum temperatures reach their peak—27°C (80°F) to 31°C (89°F)—providing a warm yet comfortable coastal experience. As autumn approaches in September, temperatures remain consistent with summer, gradually easing into the cooler months of October through December, where averages return to the mid-twenties Celsius. This pattern highlights a rich, stable warmth throughout the year, typical of the tropical monsoon climate.
Indios, Magas Arriba, and Guayanilla all share a similar climate profile, with minimum temperatures reaching 18°C (65°F) in January and maximum temperatures peaking at 31°C (89°F) in August. For more detailed monthly temperatures, you can explore the links for each location: monthly temperatures in Indios, monthly temperatures in Magas Arriba, and monthly temperatures in Guayanilla.
Guayanilla, Puerto Rico, experiences a distinct precipitation pattern characterized by seasonal variability. The year starts off relatively dry in January with just 19 mm (0.8 in) of rainfall over 6 days, escalating to 26 mm (1.0 in) in February. As spring approaches, March and April see a marked increase in both rainfall and rainy days, reaching 53 mm (2.1 in) and 55 mm (2.1 in), respectively. May continues this upward trend with 67 mm (2.6 in), establishing the onset of the wetter months ahead.
The peak of rainfall occurs in the late summer and early autumn months, particularly September, where Guayanilla receives a substantial 167 mm (6.6 in) over 23 days, signifying the height of the rainy season. This is complemented by similar significant totals in August (94 mm) and October (107 mm). Following this peak, rainfall begins to taper off into the cooler months, with November and December recording 87 mm (3.4 in) and 25 mm (1.0 in), respectively. Overall, this precipitation pattern showcases the region's transition from drier months to a pronounced rainy season, heavily influenced by tropical climatic conditions.
In Guayanilla, Puerto Rico, sunshine duration exhibits a distinct seasonal pattern, peaking during the late spring and summer months. The year commences with 261 hours of sunlight in January, gradually increasing through February and March to reach 348 hours. April marks a significant transition as sunshine hours climb to 351 hours, with May taking the lead as the sunniest month of the year, basking in an impressive 361 hours. This upward trend reflects the region’s progression toward warmer and longer days, making these months particularly favorable for outdoor activities and tourism.
As summer unfolds, June, July, and August maintain high levels of sunshine, with 348, 359, and 353 hours respectively, providing near-constant sunlight. Following the peak summer months, a gradual decline in sunshine hours begins in September, diminishing to 317 hours, which signals the onset of autumn. October and November see a slight decrease further, with 316 and 299 hours, respectively, while December remains relatively bright with 320 hours. This overall trend highlights Guayanilla’s glorious sunshine, culminating in peaks during the summer, while showcasing shorter days and more varied cloud cover as the year transitions into late fall and winter.
The UV Index in Guayanilla, Puerto Rico, presents significant implications for sun safety throughout the year, with values reaching notably high levels, particularly from February to October. January starts with a UV Index of 9, categorized as "very high," corresponding to a burn time of just 15 minutes. However, as the year progresses, February escalates to an impressive 11, classified as "extreme" with a reduced burn time of only 10 minutes. The Index peaks during the spring months, culminating in a striking 14 for both April and May, requiring vigilant sun protection measures.
As summer approaches, the UV Index remains consistently high, with readings of 13 across June, July, August, and September, still within the "extreme" category and retaining a burn time of just 10 minutes. October slightly decreases to a 12, but sun protection remains crucial as the UV Index remains elevated. Moving into fall and winter, the Index drops to 9 in November and 8 in December, signaling the end of the intense UV exposure season while still necessitating caution during outdoor activities. This data highlights the importance of proactive sun safety practices for residents and visitors in Guayanilla year-round, especially from late winter through early autumn.
UV Risk Categories
In Guayanilla, Puerto Rico, daylight duration showcases a consistent pattern influenced by the region's tropical climate, with approximately 11 hours of daylight from January through February. As spring approaches, there is a slight increase in daylight, reaching 12 hours in March, April, and May. This gradual elongation leads up to the summer months, where June and July see the peak daylight duration of 13 hours, providing ample time for outdoor activities and exploration.
As summer transitions into fall, daylight hours begin to recede; August returns to 12 hours, followed by September maintaining the same duration. The decline continues into October, November, and December, reverting back to 11 hours in these months. Overall, Guayanilla experiences relatively stable daylight hours throughout the year, with only minor fluctuations, emphasizing a favorable environment that promotes extended outdoor engagement during the sunnier months.
Guayanilla, Puerto Rico, enjoys a tropical climate characterized by warm temperatures throughout the year. Average temperatures range from 24°C (76°F) in winter months to 27°C (81°F) in summer, with maximums peaking at 31°C (88°F) during July and August. Rainfall is heaviest from September to November, with September recording an average of 167 mm (6.6 in), while sunny days are abundant, particularly in April and May, which see over 350 hours of sunshine. For a deeper look into the climate specifics, visit Guayanilla climate.
Indios, Puerto Rico experiences a tropical climate characterized by warm temperatures and considerable rainfall throughout the year. Average monthly temperatures range from 24°C (76°F) in winter to 27°C (81°F) in summer, with maximums reaching up to 31°C (89°F). Precipitation varies, peaking in September with 167 mm (6.6 in) and remaining relatively stable throughout the other months, while sunshine hours average around 300 per month. This combination creates a humid yet vibrant environment suitable for diverse ecosystems. For more details, visit Indios climate.
Magas Arriba, Puerto Rico experiences a warm tropical climate with average temperatures ranging from 24°C (76°F) in January to 27°C (81°F) from June to September. The region receives significant rainfall, particularly in September with 167 mm (6.6 in), while the driest months, like January and December, see only 19 mm (0.8 in) and 25 mm (1.0 in) respectively. Sunshine is abundant throughout the year, peaking in May with 361 hours. For more detailed information, visit Magas Arriba climate.
In conclusion, Guayanilla, Puerto Rico, offers a diverse and captivating climate characterized by warm temperatures, significant sunshine, and elevated UV Index values throughout the year. The region’s precipitation pattern highlights a marked rainy season, particularly from late summer into fall, while daylight duration remains relatively stable with slight seasonal variations. These climatic features not only contribute to the vibrant ecosystems of the area but also underscore the importance of sun safety and outdoor planning. Visitors and residents alike can fully enjoy the natural beauty and recreational opportunities in Guayanilla, provided they remain mindful of the warm, sunny conditions and variability in rainfall.