Last updated: August 31, 2025
In September, Aibonito, Puerto Rico experiences a tropical climate marked by warm temperatures and significant rainfall. With maximum highs reaching 32°C (90°F) and an average temperature of 26°C (80°F), the city maintains a comfortably warm atmosphere, while nighttime lows can dip to around 23°C (73°F). This month is particularly wet, boasting an impressive precipitation total of 182 mm (7.2 in), spread over 26 rainy days, contributing to the region's lush landscapes. Coupled with an average humidity level of 79%, September in Aibonito offers a vibrant yet humid experience, perfect for those who appreciate the unique beauty of the tropics.
In September, Aibonito, Puerto Rico, experiences a tropical warmth that marks the transition into fall. The minimum temperature hovers at a comfortable 23°C (73°F), while the average reaches a pleasant 26°C (80°F), perfect for outdoor activities. As the month progresses, daytime highs climb to 32°C (90°F), mirroring the warmth of previous summer months. Despite the mild evenings, September retains a hint of humidity and warmth, establishing a trend of gradually cooling temperatures as the year moves towards the cooler months of October and November. Overall, September offers a delightful blend of warmth and comfort, inviting visitors to experience the lush landscapes of this charming mountain town.
September stands out as a remarkably wet month in Aibonito, Puerto Rico, with an impressive 182 mm (7.2 in) of rainfall spread over 26 days. This surge in precipitation marks a significant increase compared to the preceding months, such as August, which saw 102 mm (4.0 in) over 18 days. This trend highlights September's position as the peak of the rainy season, where nearly every day stretches clouds across the sky, invigorating the lush landscape. Following the intensified rainfall in September, October also remains notably wet, although with a decrease to 154 mm (6.1 in) over 25 days. Overall, this seasonal pattern underscores Aibonito's vibrant climate, characterized by a transition from the summer's humidity to a revitalizing autumn deluge.
In September, Aibonito, Puerto Rico experiences a notable humidity level of 79%, slightly lower than the peak of 80% seen in the previous two months, July and August. This marks a transition as the summer heat begins to wane, hinting at the onset of the cooler months ahead. Throughout the year, humidity fluctuates, generally hovering between 74% and 80%, with the highest levels occurring during the summer months, while autumn brings a gradual decline. September's humidity reflects the tail end of this pattern, setting the stage for the slightly drier conditions typical of October and moving into the rest of fall.
In September, Aibonito, Puerto Rico experiences a notably high UV Index of 13, categorizing it as extreme and maintaining a burn time of just 10 minutes. This trend of elevated UV levels persists through the summer months and into early autumn, mirroring the data from May to August, where the index also peaked at 14 and 13 respectively. As we transition towards the end of the year, the UV Index begins to decline, dropping to 12 in October and further to 9 in November. It's clear that while September remains a peak month for sun exposure, care should be taken throughout the entire summer as the UV index hovers at critical levels. For more details, check the Aibonito UV Index.
UV Risk Categories
As September rolls in, Aibonito, Puerto Rico, continues to bask in nearly 311 hours of sunshine, a slight dip from the peak summer months but still vibrant enough to enjoy the outdoors. Following a lively summer where months like May and July boasted over 350 hours, the sunny days show a gradual transition toward the cooler months. This pattern suggests a tendency for sunlight to begin its descent after the high of late spring and summer, yet the warm glow of September remains inviting. With October also promising a similar 310 hours, the picturesque landscapes of Aibonito remain a perfect canvas of lush greenery and brilliant skies, inviting both locals and visitors to relish the tail end of summer's warmth.
In Aibonito, Puerto Rico, the likelihood of enjoying sunny weather in September stands at 43%, making it a relatively pleasant month compared to the more overcast summer months of June (21%), July (38%), and August (36%). Following a dip in sunshine during the peak heat of summer, September offers a slight improvement, with a chance comparable to that of October (44%) and decidedly brighter than April's low at 42%. As the year progresses into fall, the trend shows a gradual rise in sunny days, peaking in the winter months, particularly February (64%) and March (57%). This pattern suggests that while September may not guarantee clear skies, it still provides a fair opportunity to bask in the sun before the cooler months set in.
In Aibonito, Puerto Rico, September marks a transition in daylight duration, offering 12 hours of sunlight each day. This month maintains the same daylight length as both August and the longer days of spring, reflecting a gradual shift from the summer's peak of 13 hours in June and July. As the year progresses, daylight duration begins to taper off, with October returning to 11 hours, reminiscent of the longer winter months. This cyclical pattern evidences the region's consistent yet dynamic relationship with daylight, providing residents and visitors with ample sunshine during the vibrant month of September.
As September rolls into Aibonito, Puerto Rico, the breezy charm of the region begins to soften, with average wind speeds dipping to 2.2 m/s (5 mph). This marked decline follows a lively summer, where July and August boasted the highest gusts at 3.8 m/s (9 mph) and 3.3 m/s (7 mph) respectively. Transitioning into the calmer fall months, September's gentle winds evoke a serene atmosphere, inviting residents and visitors alike to appreciate the tranquil beauty of the island. This pattern of diminishing winds continues into October and November, subtly highlighting the seasonal shift while offering a refreshing pause before the return of stronger breezes in December. Overall, September serves as a gentle reminder of the cyclical nature of Aibonito's climate, balancing the robust warmth of summer with an inviting ease.
Weather in Aibonito varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Aibonito, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present notably different weather patterns. September boasts a warmer climate with average temperatures ranging from 23°C (73°F) at night to a scorching 32°C (90°F) during the day, accompanied by high humidity levels of 79%. This month also experiences significant rainfall, with a total of 182 mm (7.2 in) spread over 26 days. In contrast, January offers cooler temperatures, with lows of 16°C (62°F) and highs of 28°C (83°F), while providing a more pleasant atmosphere due to lower humidity at 76%. Additionally, January is significantly drier, receiving only 37 mm (1.5 in) of precipitation over 12 days. For a detailed look at January weather, check out Aibonito weather in January.
When comparing the weather in September and February, notable differences emerge. September typically sees warmer temperatures, with lows around 23°C (73°F) and highs reaching 32°C (90°F), while February offers a milder range, with minimums of 19°C (66°F) and maximums of 29°C (84°F). Additionally, September experiences significantly more rainfall, averaging 182 mm (7.2 in) over 26 days, compared to February’s lighter precipitation of 42 mm (1.6 in) across just 12 days. Humidity levels are slightly higher in September at 79%, while February maintains a comfortable 75%. For a closer look at February weather, check out Aibonito weather in February.
In comparing the weather of September and March, September tends to be warmer and wetter. September boasts an average temperature of 26°C (80°F) with maximum highs reaching up to 32°C (90°F). However, it also experiences significant rainfall, totaling 182 mm (7.2 in) over 26 days, alongside high humidity levels at 79%. In contrast, March is slightly cooler, with average temperatures around 24°C (75°F) and maximums of 30°C (85°F). Additionally, March sees a much lower precipitation total of 78 mm (3.1 in) over 16 days, accompanied by a slightly lower humidity of 74%. For more detailed information about March weather, you can check Aibonito weather in March.
September and April present notable differences in weather patterns. In September, the average temperature reaches 26°C (80°F), with daily highs peaking at 32°C (90°F) and lows around 23°C (73°F). This month is characterized by significant rainfall, accumulating 182 mm (7.2 in) over 26 days, and a humidity level of 79%. In contrast, April enjoys a slightly cooler average temperature of 24°C (76°F), with minimums of 19°C (66°F) and maximums of 30°C (87°F). Rainfall is considerably less frequent, totaling 70 mm (2.8 in) across 17 days, accompanied by a lower humidity of 75%. For a detailed look at April weather, you can check out this link: Aibonito weather in April.
In comparing the weather of September and May, September tends to be warmer with average temperatures reaching around 26°C (80°F), while May is slightly cooler with an average of 25°C (78°F). Both months experience high humidity levels, but September's humidity is slightly higher at 79% compared to May's 75%. Additionally, September sees significantly more rainfall, with 182 mm (7.2 in) spread over 26 days, in contrast to May's 78 mm (3.1 in) over just 19 days. For a more detailed look at May weather, you can visit Aibonito weather in May.
When comparing the weather in September and June, we can see that both months experience similar average temperatures, hovering around 26°C (79°F). However, September tends to be warmer, with maximum temperatures reaching up to 32°C (90°F) compared to June's peak of 31°C (89°F). One notable difference is the precipitation: September sees a significant increase in rainfall, totaling 182 mm (7.2 in) over 26 days, while June only has 78 mm (3.1 in) over 17 days. Humidity levels remain high in both months, with September slightly more humid at 79% compared to June's 77%. For more detailed insights, you can check out Aibonito weather in June.
In comparing the weather of September and July, we see that both months have similar temperature ranges, with September featuring a minimum of 23°C (73°F) and a maximum of 32°C (90°F), while July has a minimum of 22°C (72°F) and also peaks at 32°C (90°F). However, September experiences significantly higher precipitation, with 182 mm (7.2 in) over 26 days, compared to July's 91 mm (3.6 in) over just 18 days. Humidity levels remain quite close, with September at 79% and July at 80%. Overall, while both months are warm, September is notably wetter. For an in-depth look at July weather specifics, you can refer to Aibonito weather in July.
September experiences slightly warmer temperatures compared to August, with average temperatures reaching 26°C (80°F) versus 27°C (80°F) in August. However, September is notably wetter, receiving 182 mm (7.2 in) of precipitation over 26 days, compared to August's 102 mm (4.0 in) across 18 days. Humidity remains high in both months, with September averaging 79% and August at 80%. For a more detailed look at August conditions, check out Aibonito weather in August.
September and October present similar weather patterns, but with subtle differences. In September, the temperatures range from a minimum of 23°C (73°F) to a maximum of 32°C (90°F), with an average of 26°C (80°F). This month experiences more rainfall, totaling 182 mm (7.2 in) over 26 days, and humidity levels are high at 79%. In contrast, October sees a slight decrease in temperatures, with a low of 22°C (72°F) and a high of 31°C (89°F), maintaining the same average of 26°C (79°F). The rainfall also lessens to 154 mm (6.1 in) over 25 days, and humidity drops slightly to 78%. For a detailed forecast, check Aibonito weather in October.
September typically experiences warmer conditions compared to November, with minimum temperatures around 23°C (73°F) and maximums reaching up to 32°C (90°F). The average temperature in September is 26°C (80°F), accompanied by significant rainfall of 182 mm (7.2 in) over 26 days, contributing to a high humidity level of 79%. In contrast, November sees slightly cooler temperatures, with minimums of 20°C (68°F) and maximums peaking at 30°C (87°F), leading to an average temperature of 25°C (77°F). Rainfall is considerably lower at 107 mm (4.2 in) over 19 days, with humidity remaining similar at 78%. For more details on the November weather in Aibonito, check out Aibonito weather in November.
September and December weather exhibits notable differences. September boasts warmer temperatures, with a minimum of 23°C (73°F) and an average of 26°C (80°F), peaking at 32°C (90°F). This month also experiences significant rainfall, with 182 mm (7.2 in) spread over 26 days and humidity levels at 79%. In contrast, December features slightly cooler temperatures, with a minimum of 20°C (68°F), an average of 24°C (76°F), and a maximum of 30°C (87°F). Additionally, precipitation drops sharply to 45 mm (1.8 in) over 16 days, accompanied by a slightly lower humidity level of 76%. For more specific details on December weather patterns, visit Aibonito weather in December.
In September, Aibonito experiences a unique weather pattern characterized by higher humidity and frequent rainfall, setting it apart from other months. With an impressive number of rainy days, the lush landscape comes alive, making it a vibrant time for nature lovers. Although temperatures remain warm, averaging around 26°C, the persistent cloud cover and elevated humidity levels can create a more tropical ambiance. This transitional month prepares the region for the cooler days ahead, while still inviting visitors to enjoy the lush, green scenery. For more insights about Aibonito's climate throughout the year, check out Aibonito Climate.