Last updated: March 17, 2025
September in Dublin, Ireland offers a blend of mild temperatures and frequent rainfall that characterizes the beginning of autumn. With maximum highs reaching 22°C (72°F) and average temperatures hovering around 13°C (56°F), the weather can transition from pleasantly warm days to cooler evenings. However, visitors should be prepared for the minimum lows of 3°C (38°F). The month sees approximately 73 mm (2.9 in) of precipitation spread over 14 days, contributing to the city's lush greenery. An average humidity level of 86% adds to the overall moist atmosphere, making it essential to plan outdoor activities with an umbrella in tow.
As September unfolds in Dublin, the city experiences a refreshing transition from the warmth of summer to the crispness of autumn. With minimum temperatures settling around 3°C (38°F) and averages hovering at 13°C (56°F), the air takes on a cooler edge, inviting residents and visitors alike to don light layers. The maximum temperatures can still reach a pleasant 22°C (72°F), offering occasional sunny days that allow for outdoor exploration and vibrant café atmospheres. This month marks a balanced shift, as temperatures retreat from the summery highs of August while still retaining a touch of warmth, creating a perfect blend for enjoying the city's rich culture and scenic parks. As the days grow shorter, the charm of Dublin's early autumn becomes truly enchanting.
In September, Dublin experiences a moderate precipitation total of 73 mm (2.9 in), which is a slight decrease from August’s higher levels. With 14 days of rainfall, this month maintains a consistent pattern seen earlier in the year, particularly from June to August, where wet weather prevails. September's rainfall can often feel refreshing as summer transitions into autumn, although it marks a shift towards the more substantial downpours of the following months. As Dubliners prepare for the cooler days ahead, the city’s vibrant landscapes remain lush and inviting, showcasing the beauty that comes with early fall rains.
In September, Dublin experiences a notable uptick in humidity, with levels reaching 86%, aligning with the consistent pattern observed in the summer months. This slight increase signals the transition from the warm, humid weather of late summer to the cooler fall conditions. The humidity generally hovers around 85-87% throughout most of the year, providing a somewhat stable atmospheric feel. Notably, September's humidity mirrors that of July and February, suggesting a lingering warmth that is characteristic of this time of year. As the city embraces autumn, residents can expect the familiar embrace of moisture in the air, contributing to Dublin's lush landscapes and vibrant greenery.
As September arrives in Dublin, the UV Index settles at a moderate level of 5, indicating that while sun exposure is more critical compared to the earlier months, it’s manageable with some precaution. This marks a slight decline from the high levels of 7 in August and 8 in the peak summer months of June and July. With a burn time of 30 minutes, Dubliners should remain mindful of their time in the sun, enjoying the early autumn days without forgetting their sunscreen. Overall, as the summer fades, the UV Index reflects a natural decrease, urging the community to adapt their sun safety strategies accordingly. For daily updates and more details, visit Dublin UV Index.
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As summer gently transitions into autumn, September graces Dublin with a delightful 294 hours of sunshine, maintaining a warm embrace after the sun-soaked months of July and August, which each boasted 385 and 339 hours respectively. This month marks a noticeable shift as daylight begins to wane, yet still holds onto the remnants of summer's abundance, offering a vibrant tapestry of clear skies. Following the lively spring months—where April and May lit up with 311 and 391 hours of sunlight—September's softer glow prepares Dublin for the cozy months ahead. The gradual decline in sunshine hours is evident as the year progresses, highlighted by the 230 hours in October and a stark drop to 120 hours in November, showcasing the city's charming ability to adapt with each season while savoring its late-summer radiance.
As September rolls into Dublin, the likelihood of basking in sunny weather dips to 20%, marking one of the lower probabilities for sunshine throughout the year. This decline follows a modest resurgence in the sunniest months of spring and early summer, with April peaking at 44%. While autumn begins to settle in, it appears that the chances of clear skies fade along with the summer warmth, as the proximity to October—prone to even cloudier days—suggests an approaching seasonal shift. Overall, while there may still be a few bright days left, September's sunny outlook is overshadowed by a trend towards more overcast weather as the city transitions into autumn.
As the summer fades into autumn, September in Dublin offers a gentle transition with approximately 12 hours of daylight. This marks a gradual decrease from the sun-drenched 16 hours enjoyed in June and July, as the days shorten in preparation for the cooler months ahead. Following the late summer peak, September’s daylight duration begins to reflect the subtle shift in the season, presenting a balance between basking in residual warmth while hinting at the approaching change in light. As the days continue to shorten into October, the rhythm of Dublin’s daylight echoes nature's cycle, reminding us of both the beauty and impermanence of the seasons.
As summer gracefully transitions into autumn, September winds in Dublin reveal a gentle shift, with an average wind speed of 3.4 m/s (8 mph). This mild breeze mirrors the lower gusts of July and August, creating a serene atmosphere that heralds the onset of cooler days. Following the heavier winds of early spring and the peak summer calm, September’s refreshing yet subdued air encourages leisurely strolls through the vibrant city. With the wind picking up again slightly in October, Dublinites can savor the last whispers of warmth before the more robust autumn gusts arrive, emphasizing the persistent charm of the Irish capital during this time of year.
The weather in Dublin 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 Dublin and find detailed weather information for every month.
In September, the weather in Dublin tends to be milder with average temperatures ranging from a minimum of 3°C (38°F) to a comfortable maximum of 22°C (72°F). The month experiences a higher amount of precipitation, totaling 73 mm (2.9 in) over approximately 14 days, along with fairly high humidity at 86%. In contrast, January presents a more chilling climate, with average temperatures dipping to a minimum of -3°C (26°F) and only reaching a maximum of 13°C (56°F). Although January sees less rainfall at 57 mm (2.2 in) over about 10 days, the humidity remains comparable at 85%. For more details on how January weather unfolds in Dublin, you can check out Dublin weather in January.
September and February present distinctly different weather patterns. September typically features milder temperatures, with a minimum of 3°C (38°F) and an average of 13°C (56°F), peaking at 22°C (72°F). In contrast, February experiences cooler conditions, starting from a minimum of -2°C (29°F) and averaging around 6°C (43°F), with a maximum of 14°C (58°F). Both months see similar levels of precipitation, with September recording 73 mm (2.9 in) and February slightly higher at 80 mm (3.1 in), each experiencing about 14 days of rainfall. Interestingly, humidity remains consistent at 86% across both months. For more detailed insights, you can visit Dublin weather in February.
September and March present contrasting weather experiences, despite both months having similar humidity levels of 86%. September enjoys milder temperatures, with averages around 13°C (56°F) and maximums reaching 22°C (72°F), while March sees cooler conditions, with averages dropping to about 7°C (44°F) and maximums around 16°C (61°F). Additionally, March tends to be chillier, evidenced by its minimum temperature of -5°C (24°F) compared to September's minimum of 3°C (38°F). Both months receive comparable amounts of precipitation, with September totaling 73 mm (2.9 in) and March slightly higher at 81 mm (3.2 in), though September has its rain spread over 14 days, while March experiences it on 15 days. For more detailed information, check out Dublin weather in March.
In comparing the weather of September and April, September generally presents milder conditions with average temperatures ranging from 3°C (38°F) to 22°C (72°F), while April sees cooler temperatures with a range from -2°C (29°F) to 19°C (66°F). September is characterized by higher precipitation levels at 73 mm (2.9 in) over 14 days, compared to April's 52 mm (2.0 in) over 11 days. Humidity levels remain relatively similar, at 86% in September and 85% in April. For more detailed information, you can check out Dublin weather in April.
When comparing the weather in September and May, we see some intriguing similarities and differences. In September, temperatures range from a chilly 3°C (38°F) at night to a pleasant 22°C (72°F) during the day, with an average of 13°C (56°F). The month experiences around 73 mm (2.9 in) of precipitation spread over 14 days, accompanied by high humidity at 86%. In contrast, May has slightly cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 21°C (71°F), resulting in an average of 11°C (52°F). Precipitation is similar at 72 mm (2.8 in) over 14 days, but the humidity is a touch lower at 83%. For more details on the weather specifics for this month, check out Dublin weather in May.
In comparing the weather of September and June, one can observe a gradual transition as summer winds down. September features cooler temperatures, with a minimum of 3°C (38°F) and an average of 13°C (56°F), while June sees slightly warmer conditions, starting at a minimum of 6°C (42°F) and averaging 14°C (57°F). Although both months experience similar levels of precipitation, with September receiving 73 mm (2.9 in) over 14 days and June slightly higher at 75 mm (3.0 in) across 15 days, the humidity levels remain comparable, with September at 86% and June at 85%. For a more detailed look into June's weather, you can check out Dublin weather in June. Overall, September typically feels cooler and more transitional compared to the warmer, more stable temperatures of June.
In comparing the weather between September and July, September experiences cooler temperatures, with a minimum of 3°C (38°F) and an average of 13°C (56°F), while July sees warmer conditions, starting at a minimum of 8°C (46°F) and averaging around 16°C (60°F). The maximum temperatures reflect this difference as well, with September peaking at 22°C (72°F) compared to July's 25°C (77°F). Both months have a similar amount of precipitation, with September recording 73 mm (2.9 in) and July slightly higher at 80 mm (3.2 in), both spread over 14 days. Humidity remains constant at a high 86% for both months. For a more detailed insight, you can check out Dublin weather in July.
In comparing the weather between September and August, September experiences cooler temperatures overall, with a minimum of 3°C compared to August's 7°C. The average temperature in September is 13°C, slightly lower than August's 15°C, while both months share a similar maximum temperature at 22°C and 23°C, respectively. Precipitation in September totals 73 mm over 14 days, which is less than the 95 mm experienced in August across 16 days. Humidity levels remain comparable, with September at 86% and August at 85%. For a closer look at August's weather in Dublin, you can view more details at Dublin weather in August.
September and October showcase a gradual transition in weather as autumn settles in. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 22°C (72°F), with an average of 13°C (56°F). The month experiences 73 mm (2.9 in) of precipitation over 14 days and maintains a high humidity of 86%. In contrast, October experiences cooler temperatures, with a minimum of 1°C (35°F), an average of 11°C (51°F), and a maximum of 18°C (65°F). Although October sees slightly more precipitation at 87 mm (3.4 in) over the same number of rainy days, humidity remains similar at 87%. For a deeper dive into October's conditions, you can check out Dublin weather in October.
September typically experiences milder temperatures, with averages around 13°C (56°F) and maximums reaching up to 22°C (72°F). In contrast, November sees a significant drop, averaging just 8°C (46°F) with maximum temperatures capping at 15°C (59°F). Both months have similar humidity levels of 86% and approximately 14 days of precipitation; however, November receives slightly more rainfall, totaling 97 mm (3.8 in) compared to September's 73 mm (2.9 in). For more detailed insights, you can check Dublin weather in November.
September and December showcase distinctly different weather patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 22°C (72°F), with an average of 13°C (56°F), while the month experiences 73 mm (2.9 in) of precipitation over about 14 days and humidity levels at 86%. In contrast, December brings cooler conditions, with temperatures dropping to a minimum of -2°C (28°F) and peaking at 13°C (56°F), averaging 6°C (44°F). Precipitation increases to 94 mm (3.7 in) over approximately 15 days, and humidity remains relatively stable at 84%. For more information, visit Dublin weather in December.
As September rolls into Dublin, the city experiences a notable transition, unveiling a blend of mild temperatures and increased dampness. While the maximums average around a pleasant 22°C (72°F), a refreshing chill marks the evenings, reminding residents that autumn is on the horizon. This month tends to be more humid, with an average of 86%, contributing to the frequent rainfall—roughly 14 days of precipitation results in about 73 mm (2.9 in) of rain. Compared to the warmer, drier summer months, September introduces a more temperate, yet unpredictable climate, making it an ideal time for layered attire and embracing the beauty of the changing season. For more in-depth information, check out the page on Dublin Climate.