Last updated: August 31, 2025
September in Carolina, Puerto Rico offers a tropical climate characterized by warm temperatures and considerable humidity. The maximum daily temperature can soar to 32°C (90°F), with an average of 28°C (82°F), providing ideal conditions for beach activities. However, residents and visitors should prepare for frequent rainfall, as the month sees about 173 mm (6.8 in) of precipitation over 23 days, contributing to a humidity level of 79%. Despite the rain, the lush environment and vibrant atmosphere make September a unique time to experience the beauty of Puerto Rico.
In September, temperatures in Carolina, Puerto Rico remain warm and inviting, with minimums around 24°C (76°F) and averaging a comfortable 28°C (82°F). Highs can reach up to 32°C (90°F), maintaining the trend of summer warmth as the month progresses. This pattern reflects the gradual transition from the sizzling summer months of July and August, where temperatures were similarly warm, highlighting the region's tropical climate. Those seeking sunny beach days will find September a delightful choice, as the lingering warmth invites outdoor activities and relaxation. As the season shifts toward autumn, temperatures begin to cool slightly, but the charm of Carolina's vibrant atmosphere and balmy weather continues to entice visitors.
September in Carolina, Puerto Rico, stands out as the wettest month of the year, with a substantial precipitation amount of 173 mm (6.8 in) recorded over 23 days. This sharp spike in rainfall, compared to an average of just 99 mm (3.9 in) in August, highlights the transition into the rainy season. The month marks a significant increase in both the frequency and intensity of rain, as it witnesses a rise in precipitation days to 23. Following the pattern of escalating wetness, October also retains a high level of rainfall, though it slightly tapers off to 145 mm (5.7 in). This trend underscores the importance of September as a pivotal time for water replenishment, setting the stage for the drier months ahead.
September marks a slight dip in humidity in Carolina, Puerto Rico, with levels averaging 79%, following the peak of 80% experienced in both July and August. This gradual decrease hints at a transition from the sweltering summer months to milder fall conditions. Interestingly, the humidity during September remains relatively high compared to earlier months in the year, such as January, February, and March, which hover around 75%. The trend of elevated humidity through the summer suggests that while the heat may be less intense than in peak summer, the tropical climate still holds onto significant moisture, creating that characteristic warmth felt throughout the island. It’s a perfect time to enjoy the lush surroundings, as the balance of humidity ensures a vibrant landscape.
In September, residents and visitors of Carolina, Puerto Rico continue to face an extreme UV Index of 13, identical to the preceding months of August and March through June. This trend of high UV levels underscores the importance of sun safety, as the burn time remains a mere 10 minutes for unprotected skin. Such consistency in the UV Index highlights the tropical climate's intensity, reminding everyone to apply sunscreen and seek shade during midday. As you soak up the beautiful Puerto Rican sun this month, stay vigilant about protecting your skin. For more details on UV levels throughout the year, check out the Carolina UV Index.
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September in Carolina, Puerto Rico, reveals a delightful transition as the summer sun begins to wane, offering 313 hours of radiant sunshine. This month continues a trend of plentiful sunlight that has been consistent since early spring, peaking at 356 hours in May. While September's sunshine dips slightly from the summer's peak, it retains a charm that complements the warm, tropical ambiance. As the calendar shifts to autumn, the balance of sunshine and cooling breezes creates a perfect backdrop for outdoor activities, making Carolina an inviting destination. Although October matches September’s sunlight, the subtly shifting landscape hints at the seasonal changes to come, ensuring that the allure of Puerto Rican sunshine remains ever-present.
In September, the likelihood of sunny weather in Carolina, Puerto Rico hovers around 48%, suggesting a moderate chance for sunshine as summer transitions into fall. This aligns closely with the trends observed in the late summer months, where the chances of clear skies are consistently lower than earlier in the year, particularly compared to February's peak at 70%. After the summer months of June and July, which offer the least sun at 24% and 43% respectively, September marks a subtle recovery in sunshine potential, although it remains slightly below the yearly average. With October closely mirroring September's conditions at 49%, visitors can anticipate a balanced blend of sun and occasional rain, perfect for enjoying the lush landscapes and vibrant culture of the region.
September in Carolina, Puerto Rico, brings 12 hours of daylight, perfectly aligning with the latter part of summer's warm embrace. As the month progresses, daylight remains consistent with August, showcasing a comforting stability amid the seasonal transitions. Leading up to this, daylight duration peaked at 13 hours in both June and July, gradually tapering down as autumn approaches, while the winter months of January through March witness a return to shorter days with 11 to 12 hours of daylight. This seasonal rhythm not only enhances the natural beauty of the region but also offers residents and visitors alike ample time to soak in the vibrant surroundings before the days shorten further.
In September, the winds in Carolina, Puerto Rico exhibit a notable dip, averaging 3.2 m/s (7 mph), the lowest for the year. This gentle breeze marks a transition from the stronger gusts experienced in the summer months, particularly July, which boasts an average of 5.3 m/s (12 mph). As the seasons shift, one can observe a pattern where the wind speeds typically peak in the summer and gradually decline into the fall, with September often heralding this mellow phase. While the warmth of summer lingers, the winds slow, providing a serene atmosphere as the island gently eases into the cooler months ahead. This calmness in September sets the stage for more tranquil and reflective days, inviting visitors to enjoy the island's beauty at a relaxed pace.
Weather in Carolina varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Carolina, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between September and January, September is notably warmer and wetter. With average temperatures reaching 28°C (82°F) and maximums climbing to 32°C (90°F), it contrasts sharply with January's cooler average of 25°C (77°F) and maximum of 29°C (85°F). Additionally, September experiences significantly higher precipitation, totaling 173 mm (6.8 in) over 23 days, while January sees a much drier climate with only 38 mm (1.5 in) across 12 days. Humidity levels are slightly elevated in September at 79%, compared to January's 76%. For more detailed insights, check Carolina weather in January.
September and February offer distinct weather experiences. In September, temperatures are generally warmer, with an average of 28°C (82°F) and maximums reaching up to 32°C (90°F). The month is notably wetter, receiving about 173 mm (6.8 inches) of rain over 23 days and maintaining high humidity levels at 79%. In contrast, February presents milder conditions with an average temperature of 25°C (77°F) and highs peaking at 29°C (85°F). Precipitation is significantly lower, totaling just 43 mm (1.7 inches) over 12 days, and humidity is slightly less at 75%. For more detailed information, visit Carolina weather in February.
In September, the weather tends to be warmer and more humid, with average temperatures around 28°C (82°F) and highs reaching up to 32°C (90°F). This month is also characterized by significant rainfall, averaging 173 mm (6.8 in) over 23 rainy days, leading to a humidity level of 79%. In contrast, March offers a milder climate, featuring average temperatures of 25°C (77°F) with maximums of 30°C (86°F) and a lower overall precipitation of 67 mm (2.6 in) spread over just 14 days, resulting in a humidity of 74%. For a more detailed comparison, you can check out Carolina weather in March.
When comparing the weather in September and April, September tends to be warmer with average temperatures around 28°C (82°F) and a maximum reaching up to 32°C (90°F), while April's average is slightly cooler at 26°C (78°F), peaking at 31°C (88°F). September also experiences significantly more precipitation, with 173 mm (6.8 in) spread across 23 days, compared to April's 56 mm (2.2 in) over just 10 days. Humidity levels are also higher in September at 79%, while April maintains a more comfortable 75%. For further details, check Carolina weather in April.
In comparing the weather of September and May, we find some intriguing similarities and differences. Both months experience warm temperatures, with September showcasing a slightly higher average temperature of 28°C (82°F) compared to May's 27°C (80°F). While both months can reach a maximum of 32°C (90°F), September tends to be wetter, with a significant 173 mm (6.8 in) of precipitation over 23 days, whereas May is much drier, receiving only 64 mm (2.5 in) across 13 days. Humidity levels are also marginally higher in September, averaging 79% compared to May's 75%. For more detailed weather insights, you can check out Carolina weather in May.
September weather presents a notable comparison to June, particularly in terms of precipitation and humidity. While both months share similar temperature ranges—with minimums around 24°C (75-76°F) and maximums of 32°C (90°F)—September tends to be more humid with an average of 79% compared to June's 77%. However, September experiences significantly higher levels of rainfall, receiving 173 mm (6.8 in) over 23 days, while June records only 68 mm (2.7 in) across 15 days. This increase in precipitation in September indicates a shift towards wetter conditions as the year progresses. For more details on June weather, visit Carolina weather in June.
When comparing the weather in September and July, both months share similar temperature ranges, with minimums at 24°C (76°F), averages around 28°C (82°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. Humidity levels are slightly lower in July at 80%, compared to September's 79%. For more details on the weather patterns in July, you can refer to Carolina weather in July.
In comparing the weather of September and August, we can see that both months share similar temperature ranges, with a minimum of 24°C (76°F), an average of 28°C (82°F), and a maximum of 32°C (90°F). However, September experiences significantly more rainfall, totaling 173 mm (6.8 in) across 23 days, compared to August’s 99 mm (3.9 in) over 18 days. The humidity levels are quite close, with September at 79% and August slightly higher at 80%. This increased precipitation in September indicates a shift towards more unsettled weather as summer comes to a close. For a more detailed look at weather patterns, you can visit Carolina weather in August.
September and October display some similarities in their weather patterns, but notable differences exist as well. Both months maintain a minimum temperature of around 24°C (75-76°F), with October experiencing a slightly lower average temperature of 27°C (81°F) compared to September's 28°C (82°F). The maximum temperatures remain consistent, peaking at 32°C (89-90°F) in both months. However, October receives less precipitation, totaling 145 mm (5.7 in) over 22 days, compared to September's 173 mm (6.8 in) across 23 days. Humidity is also slightly lower in October at 78%, compared to September's 79%. For more detailed information on October weather, check out Carolina weather in October.
In September, the weather tends to be warmer and more humid, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F) and an average temperature of 28°C (82°F). This month also experiences significant rainfall, totaling 173 mm (6.8 in) over 23 days, contributing to high humidity levels at 79%.
In contrast, November sees slightly cooler temperatures, with a minimum of 23°C (74°F), an average of 26°C (80°F), and a maximum of 31°C (87°F). The month is drier, receiving only 106 mm (4.2 in) of precipitation over 16 days, resulting in a marginally lower humidity level of 78%. For more information on the weather conditions in November, you can check Carolina weather in November.
In September, the weather tends to be warmer and wetter, with average temperatures reaching 28°C (82°F) and maximums of 32°C (90°F). This month experiences substantial rainfall, accumulating 173 mm (6.8 in) over 23 days and maintaining a high humidity level of 79%. In contrast, December offers milder temperatures, averaging 26°C (78°F) with maximums around 31°C (87°F) and only 51 mm (2.0 in) of precipitation over 16 days. Humidity drops slightly to 76%, making December feel a bit more comfortable than the humid conditions of September. For a detailed overview of what to expect, check out Carolina weather in December.
As summer transitions to autumn, September in Carolina showcases a notable shift in weather patterns. With higher humidity levels than the preceding months, the air feels more tropical, inviting occasional rain that graces the region more frequently. While temperatures remain generally warm, the month brings a unique blend of heat and moisture, creating a vibrant atmosphere. However, the significant precipitation serves as a reminder of the changing seasons, offering lush landscapes that contrast with the drier summer period. For a more in-depth look at year-round conditions, explore Carolina Climate.