Last updated: March 24, 2025
September in Castel Sant'Angelo, Italy presents a delightful mixture of warmth and mildness. With a maximum temperature reaching 29°C (84°F) and an average of 17°C (62°F), visitors can enjoy pleasant days ideal for exploring this historic site. However, temperatures can dip as low as 4°C (40°F), particularly during the cooler nights. Rainfall is also a factor, with 91 mm (3.6 in) spread across 10 days, contributing to a monthly humidity level of 67%. This blend of weather creates an enchanting atmosphere, perfect for experiencing the rich culture and captivating views that Castel Sant'Angelo has to offer.
September in Castel Sant'Angelo, Italy, offers a delightful transition into autumn, with temperatures reflecting a balance of warmth and coolness. The month begins with a minimum temperature of 4°C (40°F), gently climbing to a comfortable average of 17°C (62°F), and reaching a pleasant maximum of 29°C (84°F). This gradual drop from the summer peak, as August can be as high as 36°C (96°F), creates an inviting atmosphere for visitors seeking to explore the historic sites without the sweltering heat. As the days grow shorter, the crispness in the air hints at the approaching fall, making September a perfect time to experience the charm of Castel Sant'Angelo and its surroundings.
In September, Castel Sant'Angelo experiences a notable shift in precipitation, with 91 mm (3.6 in) of rain spread over 10 days. This increase follows the relatively drier summer months, notably July and August, where rainfall was at its lowest, totaling only 28 mm (1.1 in) and 47 mm (1.9 in), respectively. As autumn approaches, the frequency and intensity of rain escalate, hinting at a transitional climate pattern where the lushness of the landscape begins to return. The uptick in precipitation in September serves as a precursor to the even wetter months ahead, especially November which averages 148 mm (5.8 in), marking it as one of the rainiest in the year. This trend not only illustrates the changing seasons but also underscores a rich and varied climate that characterizes the region.
In September, Castel Sant'Angelo experiences a modest rise in humidity, averaging around 67%, which marks a shift from the drier summer months. After enjoying the lowest levels of the year in August at just 54%, the humidity begins to climb, signaling the transition into autumn. This increase brings a refreshing yet slightly moist atmosphere, offering a pleasant balance for both locals and visitors who are drawn to the historical charm of the area. As the month progresses, the humidity levels continue to inch closer to October's average of 78%, indicating a return to the wetter conditions characteristic of the approaching fall and winter seasons.
As summer fades into autumn, September in Castel Sant'Angelo, Italy, maintains a very high UV Index of 8, signaling the need for sun protection as you venture outdoors. This month is a slight dip from the peak summer months of July and August, when readings reached 10, yet still demands caution with a burn time of just 15 minutes. Throughout the year, trends show that UV exposure rises consistently from January's moderate levels, peaking in late spring and summer, before tapering off again in the cooler months. With this knowledge, visitors and locals alike can enjoy the beauty of Castel Sant'Angelo while staying sun-safe. For more detailed information, check out the Castel Sant'Angelo UV Index.
UV Risk Categories
As summer gracefully transitions into autumn, September in Castel Sant'Angelo offers a delightful blend of warmth and golden light, boasting 335 hours of sunshine. This marks a substantial dip from the sun-soaked peak of 431 hours in July, yet it's still a vibrant signal of lingering summer days. The sun's embrace begins to soften, reminiscent of the 390 hours recorded in May and the enchanting 348 hours of April. As the days grow shorter and cooler, visitors can revel in this gentle glow, savoring the beauty of historic landscapes bathed in golden hues. The trend shows a consistent decline from the sizzling heights of summer, yet September remains an unforgettable chapter in the sunlit saga of Castel Sant'Angelo.
As summer fades, September in Castel Sant'Angelo offers a refreshing transition with a 51% chance of sunny weather. This marks a noticeable dip from the sun-drenched peak of August (68%), yet remains significantly higher than the gloomy winter months, particularly November's bleak 24%. The weather trends throughout the year reveal a gradual increase in sun exposure from January's chilly 28% to the summer's zenith, and September finds itself comfortably nestled in the latter half of the year where sunshine is still abundant. This makes the month a delightful choice for visitors seeking to enjoy the enchanting ruins and picturesque landscapes under the soft Italian sun.
As summer gently fades into autumn, September in Castel Sant'Angelo, Italy, welcomes a daylight duration of 12 hours. This marks a slight decline from August's 13 hours, yet still showcases a generous stretch of sunlight that balances warmth with the crisp beginnings of fall. The trend reveals a gradual decrease in daylight as the year progresses, peaking in June with 15 hours before slowly tapering off through the months. As the days shorten, September invites visitors to experience the enchanting golden hour light that enhances the historic charm of this iconic fortress, making it a delightful time to explore the rich culture and stunning views.
As September graces Castel Sant'Angelo, the winds begin to soften, with average speeds dropping to a gentle 1.4 m/s (3 mph). This marks a transition from the breezy summer months; July and May experience livelier gusts of 2.1 m/s (5 mph), while September's caress feels almost tranquil. Throughout the year, the wind patterns reveal intriguing fluctuations: peaks in spring and summer give way to the more serene atmosphere of early autumn. As the crispness of fall approaches, the lighter breezes invite leisurely strolls along the Tiber, allowing visitors to fully embrace the enchanting ambiance of this historic site.
The weather in Castel Sant'Angelo changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Castel Sant'Angelo and find detailed weather information for every month.
September and January present contrasting weather conditions. September enjoys a mild average temperature of 17°C (62°F) with highs reaching up to 29°C (84°F), while evenings can drop to a chilly 4°C (40°F). It typically sees about 91 mm (3.6 in) of precipitation over 10 days, accompanied by a moderate humidity level of 67%. In stark contrast, January features colder temperatures, with an average of 2°C (36°F) and a maximum of only 15°C (58°F), plunging to a frigid -11°C (12°F) at night. The month experiences slightly less precipitation at 76 mm (3.0 in), also over 10 days, but humidity rises to a higher 85%. For a detailed look at the weather in January, check out Castel Sant'Angelo weather in January.
In September, the weather is relatively mild with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), offering an average of 17°C (62°F). The month experiences about 91 mm (3.6 in) of precipitation over 10 days, and humidity levels sit at a comfortable 67%. In stark contrast, February brings much colder conditions, with temperatures dropping as low as -18°C (-1°F) and reaching a maximum of 18°C (64°F), averaging just 4°C (40°F). While precipitation is comparable at 85 mm (3.3 in) over the same number of days, the humidity increases to 78%, making the air feel chillier. For more detailed insights, you can check Castel Sant'Angelo weather in February.
September and March present starkly contrasting weather patterns. In September, temperatures range from a mild 4°C (40°F) at night to a warm 29°C (84°F) during the day, with an average of 17°C (62°F). The month sees approximately 91 mm (3.6 in) of rainfall over about 10 days, contributing to a humidity level of 67%. In sharp contrast, March experiences much colder conditions, with temperatures dipping as low as -18°C (-1°F) at night and reaching a maximum of 18°C (65°F) during the day, averaging only 6°C (42°F). This month has slightly higher precipitation at 101 mm (4.0 in) over 11 days, with humidity peaking at 69%. For those interested in more specific weather details, you can refer to Castel Sant'Angelo weather in March.
September and April present contrasting weather patterns. In September, temperatures range from a minimum of 4°C (40°F) to a maximum of 29°C (84°F), offering a warm average of 17°C (62°F). This month sees about 91 mm (3.6 in) of precipitation over 10 days, with a humidity level of 67%. In contrast, April is cooler, with temperatures spanning from a minimum of -4°C (25°F) to a maximum of 22°C (72°F) and an average of 9°C (49°F). Rainfall is slightly lower in April at 84 mm (3.3 in) over 13 days, accompanied by a higher humidity of 71%. For more details on the unique climate of April in this region, check out Castel Sant'Angelo weather in April.
When comparing the weather in September and May, there are notable differences in temperature and precipitation. September usually experiences a wider temperature range, with averages around 17°C (62°F) and max temperatures reaching up to 29°C (84°F), while May is milder with average temperatures of 13°C (56°F) and maximums of 26°C (79°F). Precipitation is also a factor; September sees about 91 mm (3.6 in) of rain over approximately 10 days, whereas May has slightly higher precipitation at 111 mm (4.4 in) over 15 days. Additionally, humidity levels are quite similar, with September at 67% and May at 71%. For a detailed look at the weather in May, you can check Castel Sant'Angelo weather in May.
In comparing the weather of September and June, we observe notable differences in temperature and precipitation. September generally offers a wider temperature range, with minimums around 4°C (40°F) and maximums reaching up to 29°C (84°F), contrasted with June's slightly milder range of 6°C (43°F) to 31°C (89°F). Additionally, June tends to be drier, with only 53 mm (2.1 in) of precipitation over 8 days, while September receives 91 mm (3.6 in) over 10 days, leading to a more humid atmosphere at 67% compared to June’s 63%. For those interested in more details, you can check out Castel Sant'Angelo weather in June.
When comparing the weather in September and July, a noticeable shift in temperature and precipitation can be observed. In September, temperatures range from a cool minimum of 4°C (40°F) to a maximum of 29°C (84°F), with an average of 17°C (62°F), while July boasts warmer temperatures with a minimum of 11°C (52°F), an average of 21°C (70°F), and a maximum of 32°C (90°F). Additionally, September experiences significantly more rainfall, with 91 mm (3.6 in) of precipitation over 10 days compared to July’s 28 mm (1.1 in) over just 5 days. Humidity levels are also higher in September at 67%, compared to July’s 59%. For more detailed information on July weather, check Castel Sant'Angelo weather in July.
In comparison to August, September experiences cooler temperatures, with a minimum of 4°C (40°F) and an average of 17°C (62°F), compared to August's minimum of 10°C (50°F) and average of 22°C (72°F). The maximum temperatures in September peak at 29°C (84°F), significantly lower than August's sweltering highs of 36°C (96°F). Additionally, September sees increased precipitation, with 91 mm (3.6 in) over 10 days, while August receives only 47 mm (1.9 in) over 8 days. The humidity is also higher in September at 67%, compared to August's 54%. For more detailed insights into August weather, visit Castel Sant'Angelo weather in August.
In comparing the weather of September and October, we see a notable shift towards cooler temperatures and increased humidity. September enjoys a wider temperature range with a minimum of 4°C and a maximum of 29°C, averaging around 17°C. This month also experiences more rainfall, totaling 91 mm over 10 days, coupled with a humidity level of 67%. In contrast, October features cooler conditions, with temperatures ranging from a minimum of 3°C to a maximum of 23°C, averaging 12°C. Precipitation decreases slightly to 76 mm over 9 days, but humidity rises to 78%. Overall, October brings a distinct autumn feel compared to the warmer and more humid September. For more detailed information, you can check out the Castel Sant'Angelo weather in October.
September and November showcase distinct shifts in weather patterns. In September, temperatures range from a chill of 4°C (40°F) at night to a warm 29°C (84°F) during the day, with an average of 17°C (62°F). The month enjoys moderate rainfall, totaling 91 mm (3.6 in) over about 10 days and a humidity level of 67%. In contrast, November presents a more pronounced drop in temperatures, with minimums dipping to -3°C (26°F) and highs reaching only 18°C (65°F), resulting in an average of 8°C (47°F). Precipitation increases significantly to 148 mm (5.8 in) over 15 days, alongside higher humidity at 84%. For a closer look at conditions during this month, check out Castel Sant'Angelo weather in November.
September weather is generally mild, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 29°C (84°F) and an average of 17°C (62°F). The month sees about 91 mm (3.6 in) of precipitation over approximately 10 days, with humidity at 67%. In contrast, December brings much colder conditions, with minimum temperatures dropping to -8°C (17°F) and an average of just 4°C (39°F), peaking at 14°C (57°F). Precipitation increases to 155 mm (6.1 in) over 12 days, accompanied by higher humidity levels at 86%. For a detailed look at December weather, visit Castel Sant'Angelo weather in December.
As summer transitions into autumn, September brings a delightful shift in weather at Castel Sant'Angelo, blending warmth with refreshing breezes. The temperatures are notably more moderate compared to the sweltering highs of the summer months, making it an ideal time for exploration. While occasional rain showers can add to the month’s charm, the overall humidity remains comfortable, enhancing the experience of wandering through the historic sites. Overall, September serves as a warm invitation to visit and absorb the rich history and culture, all while enjoying the unique September climate that can be more favorable than the peak summer months. For a deeper dive into the weather patterns of this captivating destination, check out Castel Sant'Angelo Climate.