Last updated: March 17, 2025
September in Arklow, Ireland, presents a unique blend of mild temperatures and frequent showers, creating a characteristic early autumn atmosphere. The maximum temperature reaches a pleasant 23°C (73°F), while the average hovers around a cool 14°C (57°F), and nights can dip to a brisk 3°C (37°F). Rain is a notable feature this month, with 13 days experiencing precipitation totaling 76 mm (3.0 in), contributing to a relatively high humidity level of 86%. As the season transitions, Arklow offers a captivating mix of warmth and refreshing rain, making it an ideal time for cozy indoor activities and explorations of its scenic surroundings.
In September, Arklow, Ireland, enjoys a gentle transition from summer's warmth into the more temperate embrace of autumn. With minimum temperatures averaging around 3°C (37°F), the air begins to cool but remains milder than the chill of the approaching winter. The average temperature settles at about 14°C (57°F), providing a comfortable backdrop for outdoor activities, while daytime highs reach up to 23°C (73°F), allowing for pleasant afternoons. This month marks a significant shift compared to the balmy days of July and August, as the temperatures gradually decline, yet the lingering warmth keeps the spirit of summer alive just a little longer. As September progresses, the crispness of autumn starts to set in, shaping the landscape with its vibrant colors and inviting visitors to experience the beauty of this coastal town.
In September, Arklow experiences a moderate precipitation level of 76 mm (3.0 in), reflecting a slight decline from the preceding month's 96 mm (3.8 in). This month sees rainfall on approximately 13 days, aligning with the trend of consistent precipitation through the summer. As autumn sets in, September’s rains contribute to the area's lush landscapes, showing that even as temperatures cool, the skies continue to provide moisture. With the approach of October, when precipitation typically increases again, September acts as a gentle transition, hinting at the more abundant rains that lie ahead in the coming months.
September in Arklow, Ireland, sees a notable humidity level of 86%, mirroring the conditions of the preceding months such as July and February. This consistency of high humidity contributes to the coastal town's lush greenery and vibrant landscapes. As autumn approaches, the humidity remains relatively stable, just slightly dipping from the summer highs of 86% but aligning closely with the overall trend of the year, where humidity hovers between 83% and 87%. This gentle transition into fall maintains a refreshing atmosphere, hinting at the impending cooler months while still embracing the lingering warmth of late summer.
In September, Arklow experiences a moderate UV Index of 5, indicating a notable shift from the very high levels of summer. As the sun begins to wane, residents and visitors should still be cautious, with a burn time of 30 minutes in direct sunlight. This marks a transition from August’s high index of 7, reflecting the changing seasons and the need for continued sun protection. As autumn approaches, the UV Index gradually decreases, but it remains essential to stay aware of sun exposure during outdoor activities. For those looking for detailed insights throughout the year, visit Arklow UV Index.
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As summer fades, September in Arklow, Ireland continues to bask in a warm glow, boasting 312 hours of sunshine—a delightful reminder of the vibrant months that came before it. This trend reflects a gradual waning, yet enticingly persistent, brilliance that stretches from the sun-drenched days of July and August, where sunlight peaked at 411 and 366 hours, respectively. Though the days are getting shorter and casting a softer light, September's sun still shines brightly, making it a perfect time for outdoor pursuits amid the changing foliage. As the cozy embrace of autumn approaches, October prepares to retreat further into shadows with its 247 hours, emphasizing September's pivotal role in this seasonal transition.
In September, the likelihood of sunny weather in Arklow, Ireland drops to a modest 21%, marking it as one of the months with the least sunshine. This decrease follows a slight uptick during the summer months, peaking in April at 48%, and wanes further with the onset of autumn. Observing the trends from earlier months, it’s clear that while the summer offers more chances for sun, September doesn't quite maintain that brightness, falling in line with the generally cooler and cloudier conditions that characterize the transition to autumn. As the year progresses into October and November, the chances of sunny days continue to diminish, underscoring a shifting landscape towards the rainy season.
As September arrives in Arklow, Ireland, the summer days begin to wane, transitioning from the vibrant 16 hours of daylight in June and July to a more tempered 12 hours. This month serves as a delightful bridge, offering a golden glow as autumn's approach signals the shortening of daylight. Following a peak in August with 14 hours, September reflects a gentle decline while still basking in the warm hues of early fall. The gradual reduction of daylight serves as a reminder of nature's cyclical rhythm, heralding the upcoming cozy months ahead.
As September unfolds in Arklow, Ireland, the winds begin to soften, averaging around 3.4 m/s (8 mph), a noticeable dip from the summer months. Following a season of breezy July and August, which documented 2.9 m/s and 3.9 m/s respectively, September marks a transition into a more temperate airflow. This gentle wind movement gives way to a tranquil atmosphere, inviting residents and visitors alike to enjoy the natural beauty that surrounds them. However, the momentum picks up again as October approaches, bringing an increase to 5.1 m/s (11 mph), hinting at the briskness of autumn just around the corner.
The weather in Arklow 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 Arklow and find detailed weather information for every month.
September and January present distinctly different weather patterns. In September, temperatures typically range from a minimum of 3°C (37°F) to a maximum of 23°C (73°F), with an average of 14°C (57°F), creating a mild and comfortable atmosphere. The month sees approximately 76 mm (3.0 in) of precipitation over 13 days, while humidity levels hover around 86%. In contrast, January is much colder, with temperatures ranging from a low of -2°C (28°F) to a high of 13°C (56°F), averaging only 6°C (43°F). This month experiences less rainfall, totaling about 53 mm (2.1 in) across 10 days, and maintains a slightly lower humidity at 85%. For a more detailed look at January weather trends, visit Arklow weather in January.
In September, temperatures range from a chilly 3°C (37°F) at night to a comfortable 23°C (73°F) during the day, with an average of 14°C (57°F). The month sees about 76 mm (3.0 in) of precipitation over 13 days, accompanied by high humidity levels at 86%. In contrast, February brings colder conditions, with nighttime lows dropping to -3°C (28°F) and daytime highs reaching only 14°C (58°F), averaging 6°C (44°F). Precipitation slightly increases to 87 mm (3.4 in) over 15 days, maintaining the same humidity of 86%. For more details on February weather, you can refer to Arklow weather in February.
September and March offer contrasting weather experiences. In September, temperatures range from a mild 3°C (37°F) at night to a comfortable high of 23°C (73°F) during the day, with an average of 14°C (57°F). This month also sees about 76 mm (3.0 in) of precipitation over 13 days, all while maintaining a high humidity of 86%. In contrast, March experiences colder temperatures, with nighttime lows dipping to -5°C (23°F) and daytime highs averaging around 15°C (60°F), resulting in an overall average of 7°C (45°F). Precipitation in March slightly increases to 79 mm (3.1 in) over 15 days, with humidity remaining consistently at 86%. For more detailed insights, you can visit Arklow weather in March.
When comparing September and April weather, September generally boasts warmer temperatures, with average highs reaching 23°C (73°F) compared to April's maximum of 18°C (65°F). September's average temperature of 14°C (57°F) also surpasses April's 8°C (47°F). Although April experiences slightly less precipitation at 55 mm (2.2 in) over 11 days, September sees a bit more rain, totaling 76 mm (3.0 in) across 13 days. Interestingly, humidity levels remain quite similar, with September at 86% and April at 85%. For more details on April weather specifics, you can visit Arklow weather in April.
September and May present a contrasting yet somewhat similar climatic experience. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 23°C (73°F), with an average of 14°C (57°F), while May showcases slightly cooler temperatures, between 1°C (33°F) and 21°C (69°F), averaging 11°C (52°F). Both months experience a comparable amount of rainfall, with September receiving 76 mm (3.0 in) over 13 days and May slightly less at 70 mm (2.8 in) across 12 days. Humidity is a bit higher in September at 86%, compared to May's 83%, contributing to a feeling of mild dampness in the air. For detailed insights on May weather specifically, you can check out Arklow weather in May.
In comparing the weather between September and June, both months exhibit a similar average temperature of 14°C (57°F), yet they differ in other aspects. September offers cooler nights, with a minimum temperature of 3°C (37°F), compared to June's slightly warmer minimum of 6°C (43°F). Additionally, September experiences a higher maximum temperature of 23°C (73°F), while June reaches up to 25°C (77°F). Precipitation levels are relatively close, with September receiving 76 mm (3.0 in) over 13 days and June totaling 67 mm (2.6 in) over the same number of days. Both months also display high humidity, with September at 86% and June at 85%. This slight variation in humidity contributes to the overall feeling of the weather during these months. For more detailed insights into June weather in Arklow, you can visit Arklow weather in June.
In comparing the weather between September and July, we can see a noticeable difference in temperature and precipitation. September experiences a wider temperature range, with a minimum of 3°C (37°F) and a maximum of 23°C (73°F), resulting in an average temperature of 14°C (57°F). In contrast, July is warmer with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 25°C (78°F), yielding an average of 16°C (61°F). Both months experience similar precipitation levels, with September recording 76 mm (3.0 in) and July slightly lower at 68 mm (2.7 in), though both see rain on about 13 days. Interestingly, humidity remains consistent in both months at 86%. For a detailed look at July weather, you can visit Arklow weather in July.
In September, the weather shows a notable cool-down compared to August, with minimum temperatures dropping to 3°C (37°F) from August's 7°C (45°F). While both months have a similar maximum temperature of 23°C (73°F), September averages a slightly lower overall temperature of 14°C (57°F) compared to August's 15°C (60°F). Precipitation also increases in September, totaling 76 mm (3.0 in) over 13 days, compared to August's 96 mm (3.8 in) over 15 days. Interestingly, September maintains a slightly higher humidity level at 86%, compared to August's 85%. For more detailed insights, check out Arklow weather in August.
September weather tends to be milder with average temperatures reaching up to 14°C (57°F) and maximum highs of 23°C (73°F). However, as October arrives, the temperatures drop slightly, with averages around 11°C (52°F) and a maximum of 18°C (65°F). Both months experience significant precipitation, but October sees an increase to 93 mm (3.6 in) over 14 days compared to September's 76 mm (3.0 in) over 13 days. Humidity remains relatively high, with September at 86% and October slightly higher at 87%. For a more detailed overview of October weather in this region, you can visit Arklow weather in October.
In September, temperatures are mild, with a minimum of 3°C (37°F) and an average of 14°C (57°F), reaching a maximum of 23°C (73°F). The month experiences approximately 76 mm (3.0 in) of precipitation over 13 rainy days, while humidity remains high at 86%. By November, the weather takes a noticeable turn, with a drop in average temperatures to 8°C (47°F), maximums of only 15°C (59°F), and minimums now at 0°C (33°F). Precipitation also increases to 108 mm (4.3 in) over 15 days, maintaining the same humidity level of 86%. For more detailed information, check out Arklow weather in November.
In September, the weather is milder, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 23°C (73°F) and an average of 14°C (57°F). This month also sees 76 mm (3.0 in) of rain over about 13 days, accompanied by relatively high humidity at 86%. In contrast, December experiences cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 13°C (56°F), averaging around 7°C (44°F). Precipitation increases to 107 mm (4.2 in) over 14 days while humidity remains slightly lower at 84%. For further details, check Arklow weather in December.
As September settles in, Arklow experiences a transition marked by a notable drop in temperatures and an increase in precipitation, distinguishing it from the warmer summer months. The days become crisper and more overcast, with humidity levels remaining high, giving the air a noticeable dampness. While the maximum temperature still reaches a pleasant 23°C (73°F), the average cools down to a refreshing 14°C (57°F), hinting at autumn's approach. With rainfall occurring on around half the days of the month, it's a reminder of the changing seasons and the need for a good raincoat. To understand more about the climatic patterns throughout the year, visit Arklow Climate.