Last updated: August 31, 2025
In September, Catano, Puerto Rico, experiences a tropical climate characterized by warm temperatures and significant precipitation. With daily highs reaching up to 32°C (90°F) and an average of 28°C (82°F), the weather remains consistent and inviting despite the tropical humidity averaging 79%. Rainfall is prevalent, amounting to 173 mm (6.8 in) over approximately 23 days of the month, making it one of the wetter times of the year. While visitors can expect frequent showers, the vibrant landscape and lush surroundings offer a picturesque backdrop that captures the essence of the island during this season.
In Catano, Puerto Rico, September marks the peak of warmth, with temperatures consistently high. The month features a minimum of 24°C (76°F) and an average around 28°C (82°F), reaching a maximum of 32°C (90°F). This trend reflects the gradual rise in warmth observed since the start of summer, as temperatures have hovered around the mid-20s to low-30s°C throughout the warmer months. As the heat lingers in September, it's a perfect time for outdoor adventures and soaking up the vibrant island atmosphere, while also hinting at the slight cooling that October will bring just around the corner.
In September, Catano, Puerto Rico, experiences a significant surge in precipitation, with an impressive 173 mm (6.8 in) of rainfall over 23 days. This marked increase follows the upward trend seen from the earlier months, notably with July and August registering 87 mm (3.4 in) and 99 mm (3.9 in), respectively. The combination of higher rainfall and frequent rainy days in September underscores the onset of the wet season, creating a contrast to the drier months at the beginning of the year, where January and February averaged only 38 mm (1.5 in) and 43 mm (1.7 in). As summer transitions to fall, the landscape bursts with vitality, nourished by these abundant rains, making September the wettest month of the year in this vibrant coastal region.
In Catano, Puerto Rico, September brings a humidity level of 79%, representing a slight decline from the peak months of July and August, which both recorded 80%. This subtle drop marks a continuation of the trend observed throughout the year, with humidity levels generally hovering between 74% and 80%. Typically, the summer months are the most humid, peaking in July and August, followed by a gradual decrease as autumn approaches. This pattern creates a warm, tropical atmosphere that characterizes Catano's enchanting climate, keeping the air comfortably moist even as it cools slightly into fall.
In September, Catano, Puerto Rico, experiences a UV Index of 13, maintaining its status within the extreme exposure category. This means that residents and visitors should be particularly vigilant, as the burn time is a mere 10 minutes under direct sunlight. Notably, September mirrors the UV levels observed in the preceding months of August and July, highlighting a consistent pattern of high UV intensity as the summer transitions into fall. With a UV Index that remains on the higher end of the scale, it’s crucial to take appropriate sun safety measures throughout the month. For more details on the UV Index in your area, visit Catano UV Index.
UV Risk Categories
As September unfolds in Catano, Puerto Rico, the sun continues to shine brightly, delivering a remarkable 313 hours of sunshine this month. This bright trend follows the peak sunshine months of May and June, which basked in an impressive 356 and 343 hours respectively. While September's hours dip slightly from the summer highs, the weather remains favorable as autumn approaches, maintaining a steady glow similar to October. As the year transitions, the sunshine hours gradually retreat, yet September’s abundant light extends the joys of summer just a little longer, encouraging outdoor adventures and sunshine-filled moments in this vibrant coastal town.
In Catano, Puerto Rico, September offers a moderate 48% chance of sunny weather, marking a slight dip from the vibrant summer months of July and August. While early summer sees a peak in sunshine, the transition into fall introduces a cloudier pattern. Despite this, September's sunny days can still provide a delightful backdrop for enjoying the island's natural beauty. As the month progresses, the likelihood of sunshine begins to stabilize, paving the way for October's mix of sun and occasional showers. Ultimately, while September may not be the sunniest month, it does not shy away from offering glimpses of bright days amidst the shifting weather patterns.
In September, Catano, Puerto Rico, enjoys a delightful 12 hours of daylight, maintaining the consistency observed throughout the summer months. As the year progresses from the sun-drenched days of June and July, which offer the most daylight at 13 hours, September marks a subtle shift, signaling the onset of autumn. The daylight duration begins to taper off in October, diminishing to 11 hours, reflecting a gradual transition as the year progresses. This trend showcases a dynamic interplay between the seasons, where the lush, vibrant summer gives way to shorter days, all while remaining warmly illuminated for a significant part of the day.
In September, Catano, Puerto Rico experiences a notable drop in wind speed, averaging just 3.2 m/s (7 mph). This decrease marks the tail end of a summer where winds typically picked up momentum, reaching their peak in July at around 5.3 m/s (12 mph). Following the vibrant summer months, August sees a slight decline to 4.6 m/s (10 mph), setting the stage for September’s gentle breezes. As the region transitions into fall, the calming winds reflect a shift in the season, offering a serene atmosphere that contrasts with the more vigorous gusts of earlier months. This trend highlights the cyclical nature of wind patterns in Catano, creating a soothing backdrop for the onset of autumn.
Weather in Catano varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Catano, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between September and January, we see notable differences in temperature and precipitation. September ushers in warmer conditions, with average highs reaching 32°C (90°F) and around 173 mm (6.8 in) of rainfall over 23 days, resulting in a humidity level of 79%. In contrast, January features milder temperatures, with an average high of 29°C (85°F) and significantly less precipitation at 38 mm (1.5 in) over just 12 days, while maintaining a slightly lower humidity of 76%. For more details on the weather during this month, you can check Catano weather in January.
When comparing the weather in September and February, it's evident that September tends to be warmer and more humid. In September, temperatures range from a minimum of 24°C (76°F) to an average of 28°C (82°F), peaking at 32°C (90°F). This month also experiences significant precipitation, with 173 mm (6.8 in) falling over 23 days and humidity at a high of 79%. In contrast, February is milder, with a minimum temperature of 21°C (70°F), an average of 25°C (77°F), and a maximum of 29°C (85°F). Precipitation in February is considerably less, totaling 43 mm (1.7 in) over 12 days, alongside a slightly lower humidity level of 75%. For more detailed information, you can check Catano weather in February.
September and March exhibit notable differences in weather patterns. September tends to be warmer, with average temperatures reaching 28°C (82°F) compared to March's average of 25°C (77°F). While September experiences higher maximum temperatures of 32°C (90°F), March peaks at 30°C (86°F). Additionally, September is significantly wetter, receiving 173 mm (6.8 in) of precipitation over 23 days, while March has a much lighter rainfall total of 67 mm (2.6 in) across 14 days. Humidity levels are also slightly higher in September at 79%, compared to 74% in March. For more detailed insights into March weather, you can visit Catano weather in March.
When comparing the weather in September and April, notable differences in temperature and precipitation emerge. September boasts slightly warmer temperatures, with an average of 28°C (82°F) and highs reaching up to 32°C (90°F), whereas April features a cooler average of 26°C (78°F) and a maximum of 31°C (88°F). Additionally, September experiences significantly more rainfall, with 173 mm (6.8 in) over 23 days, compared to April’s 56 mm (2.2 in) over just 10 days. Humidity levels are also marginally higher in September at 79%, compared to 75% in April. For more detailed information on April weather, visit Catano weather in April.
When comparing the weather in September and May, both months experience similar maximum temperatures, peaking at 32°C (90°F). However, September tends to be slightly warmer on average with a temperature of 28°C (82°F), compared to May's average of 27°C (80°F). September is also notably wetter, with a significant rainfall of 173 mm (6.8 in) spread across 23 days, compared to May's more manageable 64 mm (2.5 in) over just 13 days. Humidity is somewhat higher in September at 79%, while May sees a slightly lower level of 75%. For more details on the weather patterns in May, you can visit Catano weather in May.
When comparing the weather in September and June, both months exhibit similar temperature ranges, with minimums around 24°C (75-76°F) and maximums peaking at 32°C (90°F). However, September tends to be more humid, with an average humidity of 79% compared to June's 77%. Precipitation also varies significantly; September experiences higher rainfall at 173 mm (6.8 in) over 23 days, while June has a notably lower total of 68 mm (2.7 in) over 15 days. For more details, you can check Catano weather in June.
September and July exhibit quite similar temperature ranges, with both months experiencing minimums of 24°C (76°F) and maximums reaching 32°C (90°F). However, September is notably wetter, receiving 173 mm (6.8 in) of precipitation over 23 days, compared to July's 87 mm (3.4 in) over 18 days. Additionally, September's humidity is slightly lower at 79%, while July has a humidity level of 80%. For more detailed information on July weather, you can check Catano weather in July.
In comparing the weather of September and August, it is evident that both months share similar temperature metrics, with daily averages resting at around 28°C (82°F) and maximums peaking at 32°C (90°F). However, September experiences significantly higher precipitation levels, accumulating 173 mm (6.8 in) over 23 days, compared to August's 99 mm (3.9 in) across 18 days. Humidity levels remain fairly consistent, with September at 79% and August slightly higher at 80%. For more details on August weather specifics, you can refer to Catano weather in August.
In comparing the weather of September and October, we see some subtle yet notable differences. September tends to be slightly warmer with an average temperature of 28°C (82°F) and maximum daily highs reaching 32°C (90°F). In contrast, October presents a marginally cooler average temperature of 27°C (81°F), yet still maintains the same maximum of 32°C (89°F). Precipitation levels also decrease in October, with 145 mm (5.7 in) over 22 days compared to September's 173 mm (6.8 in) across 23 days. Humidity remains fairly consistent, hovering around 79% in September and just slightly lower at 78% in October. For detailed insights on October's climate, you can check Catano weather in October.
In comparing the weather between September and November, we see some notable differences. September tends to be warmer, with average temperatures reaching 28°C (82°F) and maximums hitting 32°C (90°F), while November features slightly cooler temperatures, averaging around 26°C (80°F) and peaking at 31°C (87°F). Additionally, September experiences significantly more rainfall, with 173 mm (6.8 in) over 23 days, compared to November's 106 mm (4.2 in) across 16 days. The humidity remains relatively consistent, at 79% in September and slightly lower at 78% in November. For more detailed information, check out Catano weather in November.
In September, the weather tends to be warmer and wetter, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F) and an average of 28°C (82°F). This month sees significant precipitation, totaling 173 mm (6.8 in) spread across 23 days, resulting in high humidity levels at 79%. Conversely, December brings slightly cooler 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 drops to 51 mm (2.0 in) over 16 days, and humidity decreases marginally to 76%. For more detailed insights, you can explore Catano weather in December.
As September rolls in, Catano experiences a distinct shift in its weather patterns compared to other months. With temperatures averaging around 28°C (82°F), it feels warmer yet slightly more humid, with levels soaring to 79%. This month is marked by increased precipitation, with rain gracing the area on about 23 days, resulting in a total of 173 mm (6.8 in). This combination of heat and humidity gives September its unique tropical charm, distinguishing it from the drier and cooler months that precede it. For more insights into how September fits into the broader climate of the region, check out Catano Climate.