Last updated: March 17, 2025
In September, Castlewellan experiences a temperate climate where the maximum temperature reaches a pleasant 20°C (69°F), while the average temperature lingers around a cool 13°C (56°F), dipping to a minimum of 5°C (41°F) at night. This month is characterized by notable precipitation, totaling 83 mm (3.3 in) over approximately 16 days, contributing to the lush greenery of the landscape. With a humidity level averaging 88%, visitors can expect a refreshingly crisp atmosphere, ideal for exploring the stunning natural scenery that Castlewellan has to offer.
As summer gives way to autumn in Castlewellan, September showcases a delightful shift in temperatures. With minimums around 5°C (41°F) and averages settling at 13°C (56°F), the month is pleasantly cool. Daytime high temperatures peak at 20°C (69°F), providing a perfect opportunity for enjoying the picturesque surroundings. This transition marks a gentle drop from the warm summer months, while still offering mild conditions, making it an ideal time for outdoor activities against a backdrop of changing foliage. As the days grow shorter and the air crisper, September serves as a beautiful bridge into the fall season.
In September, Castlewellan experiences a notable shift in weather patterns, with precipitation measuring 83 mm (3.3 in) over 16 days. This marks a slight decrease from the previous month, August, which recorded 120 mm (4.7 in), yet still reflects the region's characteristic dampness as autumn approaches. Following a relatively dry April, the August rains set the stage for September's moisture, demonstrating the typical fluctuation between summer and fall. With autumn on the horizon, this month serves as a transitional phase where the landscape thrives under the soft, consistent rains, preparing for the heavier downpours anticipated in the coming months. Overall, September's precipitation aligns with established trends, highlighting the ongoing shift toward wetter conditions as the year winds down.
As September arrives in Castlewellan, the humidity reaches a notable 88%, marking a slight increase from the summer months. This uptick reflects a trend of higher moisture levels as the year progresses, with the humidity gradually climbing from 82% in May to the seasonal peak of 90% in November. While September sees a slight rise, it is part of a broader pattern that indicates a moist autumn is on the horizon, leading into the wetter winter months. Such humidity can create a lush, vibrant landscape, hinting at the rich and often picturesque scenery that characterizes this charming part of the United Kingdom.
In September, Castlewellan experiences a moderate UV Index of 5, suggesting a balanced sun exposure that requires some caution. This marks a slight decline from the peak levels seen during the summer months, where the index climbed to 8 in both June and July. As the warmer days of summer give way to autumn, residents and visitors can still enjoy outdoor activities with a burn time of around 30 minutes before needing to seek shade or apply sunscreen. This transition showcases the natural ebb and flow of UV intensity throughout the year, promoting awareness as the sun's rays begin to soften with the changing seasons. For more detailed insights on UV levels throughout the year, check out Castlewellan UV Index.
UV Risk Categories
As summer transitions to autumn, September in Castlewellan brings a delightful dip in sunshine hours, with an average of 295 hours of radiant light. This month showcases a more gradual decline from the peak brightness of May and June, where the sun shone a robust 403 and 394 hours respectively. Although September's total is significantly lower than the high summer months, it still offers a charm all its own, nestled comfortably between the lush greenery of late summer and the vibrant hues of early fall. The reduction in sunshine signals a seasonal shift, paving the way for cozy evenings and the warm glow of autumn days ahead, all while still enjoying a respectable amount of daylight.
As September rolls in, Castlewellan experiences a modest 21% chance of sunny weather, marking it as one of the less favorable months for sun-seekers. This slight dip in sunshine likelihood follows a peak in the spring with April showing a robust 43% chance and declines further during the summer months. Interestingly, while September may not boast the sunniest days, it does offer a gentle transition into autumn, with temperatures still mild compared to the colder months ahead. Overall, the likelihood of sunshine in September reflects a continuation of the region's seasonal variability, encouraging visitors to embrace the charm of Castlewellan, rain or shine.
As summer fades into autumn, September in Castlewellan embraces a delightful transition with approximately 12 hours of daylight. Following the lengthy, sun-soaked days of June and July, which boast up to 17 hours of sunlight, September marks a gentle decline in daylight. This gradual reduction begins in August with 14 hours and continues into October, where light diminishes further to 10 hours. As the days grow shorter, Castlewellan sets the stage for the cozy embrace of autumn, inviting residents and visitors alike to savor the rich hues of changing leaves both in the daylight and during the softly extending twilight.
As the summer fades into autumn, September in Castlewellan witnesses a gentle shift in wind patterns, with an average wind speed of 3.9 m/s (9 mph). This slight increase from the languid winds of July and August signifies the gradual transition towards the brisker autumn months ahead. Notably, while spring months like April and May experienced higher gusts, the overall trend through the late summer into early autumn reveals a dip in wind speeds, hinting at a more tranquil atmosphere as nature prepares for the vibrant changes of October and November, which both promise a return to stronger breezes. The evolving rhythm of the wind serves as a reminder of the seasonal dance that envelops this beautiful UK locale.
The weather in Castlewellan 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 Castlewellan and find detailed weather information for every month.
September and January present contrasting weather patterns. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 20°C (69°F), with an average of 13°C (56°F). This month experiences significant rainfall with 83 mm (3.3 in) over 16 days and has a high humidity level at 88%. In contrast, January sees colder conditions with temperatures ranging from -2°C (29°F) to a maximum of 13°C (56°F) and an average of just 6°C (43°F). The precipitation is slightly lower at 68 mm (2.7 in) over 12 days, and humidity is slightly less at 87%. For more detailed information, check out Castlewellan weather in January.
September and February exhibit notable differences in weather patterns. In September, temperatures range from a mild 5°C (41°F) at night to a comfortable 20°C (69°F) during the day, with an average of 13°C (56°F). The month sees approximately 83 mm (3.3 in) of precipitation over 16 days, accompanied by high humidity at 88%. In contrast, February brings colder conditions, with temperatures dipping to a minimum of -1°C (31°F), peaking at 12°C (55°F) and averaging 6°C (43°F). Rainfall increases slightly to 99 mm (3.9 in) over 17 days, with humidity remaining relatively high at 86%. For a more detailed look at February's climate, check out Castlewellan weather in February.
September and March present distinct weather patterns, with September typically enjoying milder temperatures and conditions. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 20°C (69°F), bringing an average of 13°C (56°F). It also experiences moderate precipitation with 83 mm (3.3 in) over 16 days and a high humidity of 88%. In contrast, March is generally cooler, with temperatures dipping to a minimum of -3°C (27°F) and peaking at 14°C (58°F), averaging around 7°C (44°F). Although March has slightly higher precipitation at 92 mm (3.6 in) over the same number of days, it maintains a slightly lower humidity of 86%. For a more detailed look at March weather, check out Castlewellan weather in March.
When comparing the weather in September and April, September generally boasts milder temperatures, with an average of 13°C (56°F) compared to April's cooler average of 8°C (47°F). The minimum temperatures in September stay above freezing at 5°C (41°F), whereas in April, they can dip to 0°C (32°F). Additionally, September experiences higher precipitation levels, totaling 83 mm (3.3 in) over 16 days, while April sees only 47 mm (1.8 in) spread across 9 days. Humidity remains relatively similar, with September at 88% and April at 85%. For a more detailed look at April’s climate, you can check Castlewellan weather in April.
When comparing the weather in September and May, September tends to be slightly warmer with average temperatures ranging from 5°C (41°F) to 20°C (69°F), whereas May sees temperatures from 2°C (35°F) to 19°C (67°F). September also experiences more precipitation, with 83 mm (3.3 in) over 16 days compared to May's 66 mm (2.6 in) over 12 days. Despite these differences, both months maintain high humidity levels, with September at 88% and May a bit lower at 82%. For a more detailed look at May weather, you can visit Castlewellan weather in May.
In comparing the weather between September and June, it’s evident that both months offer mild temperatures, but with notable differences. September features a slightly cooler range, with average temperatures peaking at 20°C (69°F), while June boasts higher temperatures with maximums reaching 24°C (75°F). Precipitation levels are fairly similar, with September receiving 83 mm (3.3 in) over 16 days, compared to June's 78 mm (3.1 in) across 14 days. Additionally, September tends to be a bit more humid, with an average of 88% humidity versus June's 84%. For a more detailed overview of June weather, you can refer to Castlewellan weather in June.
In comparing the weather between September and July, we see a noticeable shift in temperature and humidity levels. September's climate features a minimum temperature of 5°C (41°F) and an average of 13°C (56°F), with a maximum of 20°C (69°F), making it cooler than July, which has a higher minimum of 9°C (48°F) and a maximum of 24°C (76°F). The average temperature in July stands at 15°C (60°F). Precipitation levels are similar, with September receiving 83 mm (3.3 in) over 16 days, while July has 85 mm (3.3 in) across 14 days. The humidity is slightly higher in September at 88% compared to July's 86%. For more details on July's conditions, you can check Castlewellan weather in July.
September's weather is characterized by cooler temperatures compared to August, with a minimum of 5°C (41°F) and an average of 13°C (56°F), whereas August starts warmer with a minimum of 9°C (48°F) and an average of 15°C (59°F). Both months experience similar maximum temperatures, with September peaking at 20°C (69°F) and August at 21°C (69°F). Precipitation is somewhat less in September, totaling 83 mm (3.3 in) over 16 days, compared to August's 120 mm (4.7 in) across 18 days. Humidity remains relatively high in both months, at 88% in September and 86% in August. For more details on August weather in Castlewellan, you can visit Castlewellan weather in August.
In September, temperatures start to cool down as the month progresses, with a minimum of 5°C (41°F), an average of 13°C (56°F), and a maximum of 20°C (69°F). The month experiences a modest amount of rainfall, totaling 83 mm (3.3 in) over 16 days, accompanied by high humidity levels averaging 88%. In contrast, October sees a further drop in temperatures, with a minimum of 2°C (37°F), an average of 11°C (52°F), and a maximum of 18°C (64°F). Precipitation increases to 104 mm (4.1 in) over 17 days, and humidity rises slightly to 89%. For more information on the expected conditions, check out Castlewellan weather in October.
In September, temperatures tend to be milder, with a minimum of 5°C (41°F) and an average of 13°C (56°F), peaking at a maximum of 20°C (69°F). The month experiences moderate precipitation of 83 mm (3.3 in) over 16 days, accompanied by relatively high humidity at 88%. In contrast, November brings cooler conditions, with temperatures dropping to a minimum of 1°C (34°F) and an average of 8°C (47°F), reaching a maximum of 14°C (58°F). Precipitation increases to 113 mm (4.5 in), also across 16 days, and the humidity rises slightly to 90%. For a detailed look at weather trends during this later month, check out Castlewellan weather in November.
In September, temperatures are generally milder, with a minimum of 5°C (41°F) and a maximum of 20°C (69°F), contributing to an average of 13°C (56°F). The month sees around 83 mm (3.3 in) of precipitation over 16 days, along with relatively high humidity at 88%. In contrast, December brings cooler temperatures, with minimums dipping to 0°C (32°F) and a maximum of 13°C (55°F), resulting in an average temperature of 7°C (44°F). This month also experiences higher total precipitation at 104 mm (4.1 in) over 14 days, though the humidity remains slightly lower at 86%. Overall, December is characterized by chillier conditions and increased rainfall compared to the more temperate September. For more details, you can check Castlewellan weather in December.
As the vibrant hues of September paint Castlewellan, the weather offers a unique transition that sets it apart from the other months. While temperatures are generally mild, with a comfortable average, the increased humidity can make the air feel heavier. The frequent rain, totaling over 80mm on about half the days, embodies the classic character of early autumn, contributing to that picturesque, lush landscape. In contrast to the warmth of summer, September introduces cooler nights, urging nature lovers and adventurers alike to embrace cozy layers. For those curious about the overall climate of this charming locale, more details can be found at Castlewellan Climate.