Last updated: August 31, 2025
In September, San German, Puerto Rico experiences a tropical climate characterized by pleasant warmth and significant humidity. The average temperature hovers around 27°C (81°F), with daily highs reaching a maximum of 32°C (90°F) and dropping to a comfortable minimum of 24°C (76°F). However, this month is also marked by considerable rainfall, totaling 159 mm (6.2 in) across approximately 21 days, contributing to the area's lush greenery. With an average humidity of 79%, visitors should prepare for a mix of sunny spells and refreshing showers, making it an ideal time to enjoy the vibrant natural beauty of this enchanting destination.
In September, San Germán, Puerto Rico experiences warm and inviting temperatures that reflect the tail end of summer. With a minimum of 24°C (76°F) and a comfortable average of 27°C (81°F), it's the ideal time for outdoor exploration and enjoying the vibrant local culture. As the days heat up, temperatures can peak at a maximum of 32°C (90°F), maintaining the lively summer feel. Notably, September's temperatures show a slight increase compared to the previous months, highlighting a trend of warmth that encourages both relaxation and adventure in this beautiful Caribbean setting. As the month progresses, the blend of heat and humidity serves as a reminder of the tropical allure that defines San Germán.
In September, San Germán, Puerto Rico, experiences a significant spike in precipitation, recording 159 mm (6.2 in) over 21 days—the highest monthly total of the year. This marks a substantial increase compared to the previous months, particularly from August, which had 96 mm (3.8 in) over the same number of days. The trend suggests that September is a transitional month, often characterized by tropical systems that contribute to the region's lush vegetation. With over half of the month seeing rainfall, residents and visitors alike can expect a lush and vibrant landscape, though they should also be prepared for frequent showers.
In San Germán, Puerto Rico, the humidity tends to fluctuate slightly throughout the year, creating a subtropical climate that’s characteristic of the region. Starting the year at a comfortable 76% in January, humidity remains steady until April. As summer approaches, levels rise, peaking at 81% in July and 80% in August, creating a warm, tropical atmosphere. September sees a slight dip to 79%, marking the end of the summer season but still maintaining significant moisture in the air. As autumn sets in, the humidity gradually decreases to 78% in October and holds steady through the end of the year. This consistent level of humidity contributes to the lush landscapes and vibrant ecosystems that make San Germán a picturesque destination year-round.
As summer transitions into autumn, September in San German, Puerto Rico, continues to show a notably high UV Index of 13, categorizing it as extreme and maintaining a consistent burn time of just 10 minutes. This trend mirrors the preceding months of July and August, which also recorded the same UV index levels, emphasizing the persistent intensity of sunlight during this period. While the UV index slightly decreases in October, the latter months still present significant exposure risks. It's crucial for residents and visitors alike to stay vigilant about sun safety; take precautions and limit direct sun exposure, especially during peak hours. For more detailed information, visit San German UV Index.
UV Risk Categories
September in San Germán, Puerto Rico, shines with an impressive 318 hours of sunlight, showcasing a delightful transition from the peak of summer. This month marks a slight dip from the sun-soaked heights of May and July, where the town basked in 363 and 361 hours, respectively. However, September's golden rays still outshine many earlier months; it offers more sunlight than both October and November. As the year progresses towards autumn, the sun’s presence lingers, providing warmth and brilliance, making San Germán a picturesque spot for embracing the last days of summer. The trends reveal that while sunlight begins to wane, September remains a vibrant testament to the island's enduring beauty.
In San Germán, Puerto Rico, the likelihood of experiencing sunny weather in September stands at 55%, which is quite favorable compared to the summer months. This month shows a noticeable uplift from the preceding June and July when chances dip to 32% and 49% respectively. September's sunny prospects mirror those of January and October, which also hover around the mid-50s, indicating a return to brighter skies after the more unpredictable summer. Overall, as the year progresses from the heat of summer to the cooler fall months, September acts as a bridge, offering a balanced chance of sunshine that invites outdoor exploration and enjoyment.
In September, San Germán, Puerto Rico enjoys approximately 12 hours of daylight, a continuation of the summer's longer days. As the month unfolds, this duration mirrors that of May and August, highlighting a shift towards the shorter days of autumn. The trend showcases a gradual transition from the extended daylight of June and July, which offer 13 hours each, back to the consistent 11 hours typical in the winter months of October through December. This rhythmic cycle of daylight not only emphasizes the region's tropical charm but also hints at the changing seasons, inviting both residents and visitors to relish in the warm, lingering evenings of the Caribbean.
In San Germán, Puerto Rico, the winds of September signal a noticeable shift in the seasonal patterns, with an average wind speed of 3.1 m/s (7 mph)—the lowest of the year. Following the brisker summer months, where winds peaked at 5.1 m/s (12 mph) in July, September marks a gentle exhale, hinting at the impending transition to fall. This decline contrasts sharply with the earlier months, creating a serene atmosphere perfect for leisurely strolls through the charming streets of this historic town. As the year progresses into October, winds pick up again, returning to a more moderate 4.0 m/s (9 mph), suggesting that while September may be calm, it serves as a brief pause before the seasonal breeze resumes its rhythm.
Weather in San German varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San German, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is warm and humid, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F), averaging around 27°C (81°F). This month also sees significant rainfall, with 159 mm (6.2 in) over approximately 21 days, leading to a humidity level of 79%.
In contrast, January offers a cooler climate, with temperatures dipping to a minimum of 19°C (67°F) and reaching a maximum of 29°C (84°F), averaging 25°C (77°F). Rainfall is considerably less during this month, with only 18 mm (0.7 in) spread over just 4 days, and a slightly lower humidity of 76%.
For more detailed information, you can explore San German weather in January.
September and February present contrasting weather conditions. In September, the temperatures are generally warmer, ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F), with an average temperature of 27°C (81°F). Additionally, September experiences considerable rainfall, with 159 mm (6.2 in) of precipitation spread over 21 days, making humidity levels high at 79%.
In contrast, February offers milder temperatures, with a minimum of 21°C (70°F) and a maximum of 29°C (85°F), averaging 25°C (77°F). The month is notably drier, with only 26 mm (1.0 in) of precipitation occurring on 5 days, and slightly lower humidity at 75%. This makes February a more comfortable and less humid month compared to the rainy and warm September. For more detailed weather information, you can visit San German weather in February.
September and March exhibit notable differences in weather conditions. September tends to be warmer, with average temperatures around 27°C (81°F) and maximums reaching 32°C (90°F), while March offers a cooler climate with average temperatures of 24°C (76°F). Additionally, September is characterized by significantly higher precipitation, totaling 159 mm (6.2 in) over 21 days, compared to March's 49 mm (1.9 in) across just 11 days. Humidity levels are also slightly higher in September at 79%, compared to 75% in March. For more detailed information, you can check out San German weather in March.
In comparing the weather of September and April, September typically experiences warmer temperatures, with a minimum of 24°C (76°F) and an average high of 32°C (90°F), compared to April's milder range of 21°C (70°F) to a maximum of 29°C (84°F). Additionally, September is notably wetter, with an average precipitation of 159 mm (6.2 in) over 21 days, whereas April sees much less rainfall at 49 mm (1.9 in) across 14 days. Despite the slight difference in humidity, with September at 79% and April at 76%, both months offer a tropical climate but with September feeling considerably more humid and rainy. For more details, you can check San German weather in April.
In comparing the weather of September and May, September tends to be slightly warmer, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F), whereas May has a more moderate temperature range of 23°C (73°F) to 30°C (86°F). September also experiences significantly more rainfall, receiving 159 mm (6.2 in) over 21 days, compared to May’s 59 mm (2.3 in) over just 12 days. Both months maintain a high humidity level, with September at 79% and May slightly lower at 76%. For a closer look at the weather specifics in May, check out this link: San German weather in May.
When comparing the weather in September to that in June, we notice a few key differences. September enjoys similar average temperatures, with a minimum of 24°C (76°F) and a maximum of 32°C (90°F), but it also experiences significantly higher precipitation levels, totaling 159 mm (6.2 in) over 21 days. In contrast, June has slightly cooler temperatures with a minimum of 23°C (75°F) and a maximum of 31°C (88°F), and it receives much less rainfall, only 53 mm (2.1 in) over 12 days. Furthermore, humidity remains relatively consistent, with September at 79% and June at 78%. For a closer look at June's weather specifics, you can check San German weather in June.
In comparing the weather of September and July, both months display similar temperature ranges, with September slightly warmer, featuring a minimum of 24°C (76°F), an average of 27°C (81°F), and a maximum of 32°C (90°F). In contrast, July has a minimum temperature of 24°C (75°F), an average of 27°C (81°F), and a maximum of 31°C (88°F). While July sees less rainfall, totaling 86 mm (3.4 in) over 16 days, September experiences significantly more precipitation at 159 mm (6.2 in) across 21 days, leading to a humid environment, although both months maintain high humidity levels around 79% and 81%, respectively. For more details about July weather, you can check San German weather in July.
In comparing the weather between August and September, both months exhibit similar average temperatures, with averages of 27°C (81°F) and maximum highs reaching 32°C (90°F). However, September experiences a higher minimum temperature of 24°C (76°F) compared to August's 23°C (74°F). A notable difference lies in precipitation; September sees significantly more rainfall, totaling 159 mm (6.2 in) over 21 days, whereas August has only 96 mm (3.8 in) across 16 days. The humidity levels are also slightly comparable, standing at 79% in September and 80% in August. For more specific details on August weather patterns, you can check San German weather in August.
In September, the weather is generally warm with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (90°F). However, this month tends to be wetter, experiencing around 159 mm (6.2 in) of precipitation spread over 21 days and a relatively high humidity level of 79%. In contrast, October sees a slight decrease in temperatures, with a similar minimum of 24°C (75°F) and a slightly lower maximum of 31°C (88°F). Precipitation also decreases to 102 mm (4.0 in) across 20 days, with humidity slightly dropping to 78%. For more detailed information, you can check out San German weather in October.
In September, temperatures tend to be warmer with a minimum of 24°C (76°F), an average of 27°C (81°F), and a maximum of 32°C (90°F). The month experiences significant rainfall, totaling 159 mm (6.2 in) over 21 days, accompanied by high humidity levels at 79%. In contrast, November sees slightly cooler temperatures, with a minimum of 23°C (73°F), an average of 26°C (79°F), and a maximum of 31°C (88°F). Precipitation is notably lower at 91 mm (3.6 in) across 15 days, while humidity remains fairly stable at 78%. For more detailed insights, you can check San German weather in November.
In September, the weather is notably warmer, with average temperatures around 27°C (81°F) and maximums reaching up to 32°C (90°F). This month also sees significant rainfall, with 159 mm (6.2 in) of precipitation spread over 21 days, resulting in a humidity level of 79%. In contrast, December offers a slightly cooler experience, with average temperatures dropping to 26°C (78°F) and maximums peaking at 30°C (86°F). Not only is there less rainfall in December, with only 25 mm (1.0 in) over 7 days, but humidity levels also decrease slightly to 77%. For a detailed overview of December conditions, check out San German weather in December.
As September unfolds in San German, the weather showcases a unique blend of warmth and humidity that distinctly contrasts with other months. With maximum temperatures reaching a balmy 32°C and an average of 27°C, this month brings a noticeable warmth tempered by high humidity levels at 79%. Rainfall becomes a regular companion, drenching the region on 21 days throughout the month, culminating in a total precipitation of 159 mm. This shift creates a lush landscape, but also means that visitors should be prepared for the regular afternoon showers. For a comprehensive overview of the climatic nuances that define San German's weather patterns, explore San German Climate.