Last updated: March 17, 2025
September in Castletownbere, Ireland, showcases a diverse climate experience, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 25°C (77°F), averaging around 14°C (57°F). This month is characterized by high humidity levels of 84%, contributing to a notably fresh atmosphere. Rainfall is prominent, as the area receives 121 mm (4.8 in) of precipitation over 18 days, making it essential for visitors to prepare for occasional showers. Whether basking in the warmth of sunny days or enjoying the crispness of rainy moments, September offers a unique blend of weather perfect for exploring the scenic beauty of Ireland's coastal town.
In Castletownbere, Ireland, September brings a delightful transition as summer wanes and autumn approaches. The temperatures during this month range significantly, with lows around 5°C (42°F) and comfortable highs peaking at 25°C (77°F). This average temperature settles at 14°C (57°F), suggesting a pleasant climate ideal for outdoor activities. Compared to the warmer summer months of July and August, which flirt with highs of 26°C (79°F), September offers a refreshing retreat without the oppressive heat, making it a perfect time to explore the stunning coastal scenery. As the month progresses, the cooling trend becomes more apparent, hinting at the colder months ahead but still allowing for enjoyable days outdoors.
September in Castletownbere marks a subtle transition in weather patterns as summer gives way to autumn. With 121 mm (4.8 in) of precipitation spread over 18 days, the month showcases a slight increase in rainfall compared to August, which recorded 139 mm but across 21 days. This indicates a shift towards more persistent, albeit lighter, showers as September maintains a steady rhythm of rain. As the year progresses, this trend continues, with precipitation levels peaking in the following months, highlighting the region’s characteristic moisture. The increased rainfall in September reflects the changing seasons, preparing the landscape for the richer, more dramatic downpours that typically follow in October and November.
In September, Castletownbere experiences a notable transition in humidity, with levels averaging 84%, a slight dip from the previous month's 86%. This gradual decrease signals the onset of autumn, following a summer of peak humidity where July reached its highest at 87%. The trend throughout the year reflects a relatively consistent humidity range, hovering between 79% and 87%. The months leading up to September, particularly May and June, showcase the area's tendency for higher moisture, creating a lush landscape that gives way to the cool, refreshing air of fall. As the year progresses into October, humidity levels are expected to stabilize around 82%, maintaining the characteristic mildness of this coastal Irish town.
As September brings a shift in season to Castletownbere, Ireland, the UV Index reflects a moderate level with a value of 5, allowing for a burn time of 30 minutes. This marks a decrease from the intense summer months, where the UV Index peaked at 8 during June and July, but still indicates the necessity for sun protection during outdoor activities. Following the trend of decreasing UV levels, October is expected to exhibit a further decline to 4. This gradual reduction reminds residents and visitors alike to remain vigilant in their sun safety, especially as the days shorten and the sun’s rays become less direct. For more detailed insights, visit Castletownbere UV Index.
UV Risk Categories
September in Castletownbere, Ireland, ushers in a beautiful transition where the summer’s warmth lingers, providing a delightful 298 hours of sunshine. This month marks a gentle descent from the sun-drenched heights of summer, with hours gradually tapering off from July's peak of 384 hours. As autumn whispers its approach, the vibrant glow of September offers a generous yet soothing embrace, especially after the sun-filled months of May and June, which recorded 387 and 377 hours, respectively. The gradual decline in sunshine hours serves as a reminder of nature's cycle, paving the way for the cozy, shorter days of October, where the sunlight dwindles further to 225 hours. This rhythmic pattern not only highlights the splendor of Castletownbere's climate but also invites residents and visitors to savor every moment of this enchanting month before the chill sets in.
In Castletownbere, Ireland, the likelihood of experiencing sunny weather notably dips in September, with just a 20% chance of sunshine. This marks a clear decline from the more inviting conditions of the spring months, such as April, which boasts a 44% chance of sunny days. As summer transitions into autumn, the sun becomes increasingly elusive, following a trend of decreased sunny days from the brighter months of May and June. Consequently, travelers seeking reliable sunshine are advised to plan their visits earlier in the year, as the sunny season ebbs away by September.
As summer's warmth begins to fade in September, Castletownbere witnesses a gentle decline in daylight hours, with the day stretching a modest 12 hours. After basking in the long, sun-filled days of June and July, which each boasted 16 hours of sunshine, this month serves as a transition, heralding the arrival of autumn. With daylight gradually decreasing from the delightful 15 hours in May to the shorter October days of 10 hours, September provides a balanced mix of light while hinting at the cozy evenings ahead. This gradual ebb of daylight captures the essence of seasonal change, inviting residents and visitors alike to relish the crisp beauty of early autumn in this charming Irish coastal town.
In September, Castletownbere experiences a gentle average wind speed of 4.3 m/s (10 mph), which is somewhat consistent with the stillness of summer, yet hints at the emerging vibrancy of autumn. This slight decline from the warmer months, where wind speeds hovered around 4.2 m/s to 4.4 m/s, reflects a transition as nature prepares for the cooler days ahead. Interestingly, September's winds mark a subtle uptick from the calmest July and August, suggesting a refreshing breeze invigorating the landscape, making it an ideal time for outdoor explorations. As we move into late autumn, the winds start to pick up again, indicating that the energetic gusts of winter are not far behind.
The weather in Castletownbere 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 Castletownbere and find detailed weather information for every month.
In September, the weather is generally milder, with temperatures ranging from a minimum of 5°C (42°F) to a pleasant maximum of 25°C (77°F) and an average of 14°C (57°F). The month sees significant precipitation, with 121 mm (4.8 in) falling over 18 days and humidity levels averaging 84%. In contrast, January presents much cooler conditions, featuring temperatures that drop to a minimum of -2°C (28°F) and peak at 14°C (57°F), with an average of 7°C (45°F). Precipitation is slightly less in January at 117 mm (4.6 in) over 15 days, accompanied by lower humidity levels at 79%. For more detailed information, you can check Castletownbere weather in January.
In September, temperatures typically range from a mild 5°C (42°F) at night to a warm 25°C (77°F) during the day, with an average of 14°C (57°F). However, the month is quite wet, with precipitation measuring 121 mm (4.8 in) across 18 days and humidity levels at a high 84%. In contrast, February brings cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 13°C (55°F), averaging 8°C (46°F). This month sees even more rainfall, totaling 187 mm (7.4 in) over 20 days, and humidity slightly lower at 82%. For more detailed information, you can check out Castletownbere weather in February.
September and March showcase contrasting weather patterns, each with its own characteristics. In September, temperatures range from a minimum of 5°C (42°F) to a comfortable average of 14°C (57°F), peaking at 25°C (77°F). The month experiences 121 mm (4.8 in) of precipitation over 18 days, accompanied by high humidity levels of 84%. In contrast, March is notably cooler, with temperatures dipping to a minimum of -5°C (24°F) and averaging 7°C (46°F), reaching a maximum of 16°C (61°F). Rainfall increases slightly to 140 mm (5.5 in), spread over 19 days, with humidity at 81%. For a more detailed look at the specific weather patterns, you can visit Castletownbere weather in March.
In comparing the weather of September and April, we observe notable differences in both temperature and precipitation. September generally offers a warmer climate, with average temperatures reaching up to 14°C (57°F) and highs of 25°C (77°F), while April's average temperature is cooler at 9°C (49°F) and peaks at 16°C (62°F). Precipitation is also more prevalent in September, averaging 121 mm (4.8 in) over 18 days, compared to April's 83 mm (3.3 in) over 12 days. Despite the higher rainfall in September, both months have surprisingly similar humidity levels, with September at 84% and April at 82%. For more detailed information on April's weather, check out Castletownbere weather in April.
When comparing the weather of September and May, we observe several notable differences. September typically experiences slightly warmer temperatures, with an average of 14°C (57°F) compared to May's 11°C (53°F). The maximum temperatures in September can reach up to 25°C (77°F), while May peaks at 20°C (69°F). However, September also brings more precipitation, averaging 121 mm (4.8 in) over 18 days, compared to May's 93 mm (3.7 in) over 15 days. Humidity levels are quite similar, with September at 84% and May at 86%. Overall, September offers warmer and wetter conditions than May. For more detailed insights, check out Castletownbere weather in May.
When comparing the weather in September and June, we see some interesting similarities and differences. Both months feature an average temperature of 14°C (57°F), but September experiences slightly cooler minimum temperatures, dropping to 5°C (42°F) compared to June's 7°C (45°F). In terms of maximum temperatures, September reaches up to 25°C (77°F), while June peaks at 26°C (79°F). Precipitation also varies; September is wetter with 121 mm (4.8 in) over 18 days, whereas June has 88 mm (3.5 in) spread over just 17 days. Humidity is closely matched, with September at 84% and June at 86%. For more detailed insights, you can check Castletownbere weather in June.
In comparing the weather between September and July, we observe notable differences in temperature and precipitation. September experiences a wider range of temperatures, with a minimum of 5°C (42°F) and a maximum of 25°C (77°F), leading to an average of 14°C (57°F). In contrast, July tends to be warmer, with temperatures ranging from 9°C (49°F) to 26°C (79°F), averaging around 15°C (60°F). Precipitation is also higher in September, accumulating 121 mm (4.8 in) over 18 days, compared to July's 88 mm (3.4 in) over 15 days. Humidity levels are slightly elevated in September at 84%, while July maintains a close figure of 87%. For more detailed insights about July weather, visit Castletownbere weather in July.
In September, temperatures drop slightly compared to August, with average highs of 25°C (77°F) in September compared to August's maximum of 21°C (70°F). The minimum temperatures also shift, as September sees overnight lows of 5°C (42°F), a notable decrease from August's 9°C (48°F). Both months experience significant precipitation, but September records 121 mm (4.8 in) over 18 days, whereas August has a slightly higher total of 139 mm (5.5 in) across 21 days. Humidity remains high in both months, with September at 84% and August at 86%. For a more detailed look at August weather in this region, you can visit Castletownbere weather in August.
September and October present notable shifts in weather, with September typically enjoying warmer temperatures. In September, the mercury ranges from a minimum of 5°C (42°F) to a maximum of 25°C (77°F), averaging around 14°C (57°F), while October sees lower temperatures with a minimum of 3°C (37°F) and a maximum of 17°C (62°F), averaging just 11°C (53°F). Additionally, October experiences increased precipitation, with 187 mm (7.4 in) falling over 19 days compared to September's 121 mm (4.8 in) over 18 days. Despite slightly lower humidity in October at 82%, the overall feel is cooler and wetter. For more detailed insights, check out Castletownbere weather in October.
In September, the weather tends to be milder with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 25°C (77°F), averaging around 14°C (57°F). The month experiences notable precipitation, totaling 121 mm (4.8 in) over 18 days, contributing to a relatively high humidity of 84%. In contrast, November presents a much cooler climate, with temperatures dropping to a minimum of 1°C (35°F) and peaking at 14°C (58°F), averaging just 9°C (49°F). Additionally, precipitation increases to 156 mm (6.1 in) over the same 18 days, coupled with a slightly lower humidity of 80%. For more details, check out Castletownbere weather in November.
In September, temperatures range from a minimum of 5°C (42°F) to a maximum of 25°C (77°F), with an average of 14°C (57°F), while December sees cooler temperatures, with minimums dropping to 1°C (33°F) and maximums only reaching 13°C (56°F), averaging at 8°C (47°F). Precipitation also increases in December, with 201 mm (7.9 in) of rain spread over 21 days compared to September’s 121 mm (4.8 in) over 18 days. Despite the wetter weather in December, humidity remains slightly lower at 79%, compared to September's higher humidity of 84%. For more details, you can check Castletownbere weather in December.
As September unfolds in Castletownbere, the weather paints a vivid contrast to the prior summer months. The delightful warm days can still reach up to 25°C (77°F), but the average temperature settles around a cooler 14°C (57°F), signaling a gentle transition into autumn. Rainfall becomes more frequent, with about 18 days of precipitation contributing to a total of 121 mm (4.8 in), which adds a refreshing touch to the landscape, though it may occasionally dampen outdoor activities. The high humidity of 84% also adds to the crispness of the air, marking a shift toward the cozier elements of the upcoming season. For those looking to delve deeper into the weather patterns of this enchanting locale, additional insights can be explored at Castletownbere Climate.