September Weather in Kilkenny, Ireland

Last updated: March 17, 2025

In Kilkenny, Ireland, September weather presents a delightful mix of mild temperatures and a touch of unpredictability. With maximums reaching up to 25°C (78°F) and averaging around 13°C (56°F), daytime conditions can be pleasantly warm, though evenings may plunge to a cool -1°C (31°F). This month also brings a noteworthy 61 mm (2.4 in) of rainfall over approximately 11 days, contributing to the lush, vibrant landscapes the region is known for. Boasting a humidity level of 86%, the air feels rich and invigorating, making September an ideal time for exploring Kilkenny's charming streets and historic sites while being prepared for the occasional shower.

September Temperature in Kilkenny

In September, Kilkenny experiences a pleasant transition into autumn, characterized by a striking shift in temperatures. With minimums dipping to -1°C (31°F), the nights can get quite chilly, yet the days are comfortably warm, boasting an average of 13°C (56°F) and peaking at a pleasant 25°C (78°F). This month signifies a notable change from the summer's warmth, as the average temperature reflects a cooling trend compared to August, while still offering plenty of mild days to explore the charming landscapes and historic sites. As the harvest season approaches, Kilkenny's vibrant cultural scene and natural beauty thrive amidst these inviting temperatures, making it an ideal time for visitors to enjoy the city’s rich heritage.

September Weather in Kilkenny: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kilkenny, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424344475257615956504543
Data source: Temperature data for Kilkenny generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kilkenny

September in Kilkenny, Ireland, marks a transition with 61 mm (2.4 in) of precipitation spread over 11 days. This reflects a slight dip compared to the wetter months of August and October, where rainfall peaks at 91 mm (3.6 in) and 85 mm (3.4 in), respectively. The consistency in average rainfall during summer months suggests a gradual easing of the abundant summer showers, while still maintaining a reliable pattern of autumn rain. As the month progresses, the likelihood of experiencing a sprinkle does not wane significantly, ensuring that Kilkenny's lush landscapes continue to thrive even as the season changes. With this rhythmic dance of rainfall, September serves as a gentle reminder of the lush greenery that characterizes this beautiful Irish locale.

September Precipitation Trends in Kilkenny

The chart displays monthly precipitation patterns in Kilkenny, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec5188795765666792618585101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kilkenny

In September, Kilkenny, Ireland, experiences a humidity level of 86%, continuing the trend of high moisture that characterizes the late summer months. This figure ties with July and stands just above the levels observed in the spring, where humidity hovered around 85%. Notably, September's humidity reflects a slight increase compared to the preceding months of May through August, suggesting a transition into the wetter autumn season. As temperatures begin to drop, the humidity remains consistently high, setting the stage for the cooler, but equally humid, months ahead. The trend shows that Kilkenny's climate is both refreshing and damp, making it a unique and lush backdrop for autumn adventures.

September Average Humidity in Kilkenny

This chart illustrates the average monthly humidity levels in Kilkenny, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kilkenny

As September arrives in Kilkenny, Ireland, the UV Index reflects a moderate level of sun exposure, registering at 5. This marks a slight decline from the peak summer months of June and July, when the index reached a high of 8, indicating very high exposure levels. With a burn time of 30 minutes, it's essential to keep sun protection in mind during outdoor activities. Transitioning from the summer's intensity, the UV Index in September mirrors the earlier months of March and April, which also featured moderate levels, though with the summer sun still fresh in memory, vigilance is key. As we move towards autumn, enjoy the pleasant weather while being mindful of the sun's rays. For more information, visit Kilkenny UV Index.

Maximum UV Index Levels in Kilkenny for September

The chart shows the monthly maximum UV Index (UVI) for Kilkenny in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Kilkenny September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Kilkenny

In September, Kilkenny, Ireland enjoys a delightful transition as summer bids farewell, basking in 297 hours of sunshine. This month reflects a gentle decline from the peak brightness of July, which boasts 397 hours, yet still holds onto the warmth and vitality of late summer. As the average daylight begins to ebb, September retains a golden charm, especially when compared to the earlier months—like January’s modest 86 hours—showing a remarkable progression towards brighter days. As autumn sets in, the city invites visitors to savor its rich history and vibrant culture illuminated by a sympathetic sun, reminding us that even as daylight decreases, the beauty of Kilkenny remains ever-present.

Monthly Sunshine Duration in Kilkenny: September Highlighted

The September sunshine duration represents the total number of hours Kilkenny experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec86h145h195h301h392h388h397h342h297h239h128h105h
Data source: Kilkenny September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kilkenny During September

In Kilkenny, Ireland, September marks a noticeable decline in the likelihood of sunny weather, with only an 18% chance of sunshine. This trend reflects a broader pattern as the summer months fade; the likelihood of sunny days peaks in the spring and early summer, particularly in April at 42%. As we transition through the warmer months, the chances decrease, culminating in September’s relatively gloomy forecast. The decrease in sunny days continues into October, where the probability dips further to 16%, suggesting that as autumn approaches, Kilkenny's skies shift from bright to overcast more frequently. Thus, while September retains some warmth, it also introduces the reality of impending clouds and cooler temperatures.

Percentage of Sunny Days in September in Kilkenny

The chart illustrates the percentage of sunny days in Kilkenny throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Kilkenny experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%22%20%42%28%22%27%24%18%16%26%19%
Data source: Kilkenny September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kilkenny in September

As summer fades in Kilkenny, September brings a gentle transition in daylight hours, offering about 12 hours of sunlight each day. This marks a noticeable decline from the lengthy 16 hours experienced in June and July, illustrating the gradual shift towards autumn. Daylight decreases steadily as the month progresses, paving the way for shorter days ahead. Following the peak of summer, September's sunlight still allows ample time for outdoor activities and enjoying the vibrant fall colors that begin to emerge, bridging the lush fullness of summer with the crisp aura of autumn. Looking forward, October will usher in even shorter days, highlighting the temporal rhythm of Kilkenny’s seasonal cycle.

Average Daylight Hours in Kilkenny for September

The chart illustrates the variation in daylight duration in Kilkenny throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 12m9h 52m11h 54m13h 59m15h 49m16h 47m16h 16m14h 37m12h 36m10h 32m8h 40m7h 40m
Data source: Kilkenny daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kilkenny

As September breezes into Kilkenny, Ireland, the average wind speed settles at a gentle 2.9 m/s (6 mph), marking a transition toward the calmer conditions that precede autumn's embrace. This notable decline from the more vigorous gusts of early summer, where July experiences its softest winds at 2.6 m/s (6 mph), suggests a shift in nature’s rhythm. Following this, the winds gradually pick up again in October, reaching 4.0 m/s (9 mph), hinting at seasonal changes on the horizon. Overall, September's mild winds invite a reflective pause, perfectly complementing the picturesque landscapes as they transition into the rich hues of fall.

Average September Wind Speed in Kilkenny

The chart displays monthly wind speed patterns in Kilkenny, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.75.04.03.03.73.42.63.22.9 m/s4.03.74.2
Data source: Kilkenny September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kilkenny Compares to Other Months

The weather in Kilkenny 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 Kilkenny and find detailed weather information for every month.

September and January present striking contrasts in weather. In September, temperatures range from a chilly minimum of -1°C (31°F) to a warm maximum of 25°C (78°F), with an average of 13°C (56°F). The month sees about 61 mm (2.4 in) of precipitation over 11 days and maintains a high humidity level of 86%. In contrast, January features lower temperatures, with a minimum of -6°C (21°F) and a maximum of 13°C (56°F), averaging only 5°C (42°F). This month experiences slightly less precipitation at 51 mm (2.0 in) over 10 days, with humidity remaining consistent at 85%. For more detailed insights into the weather, you can check Kilkenny weather in January.

September and February present quite different weather patterns. In September, temperatures range from a chilly minimum of -1°C (31°F) to a pleasant maximum of 25°C (78°F), with an average of 13°C (56°F). This month also sees a fair amount of precipitation at 61 mm (2.4 in) over 11 days, while humidity remains high at 86%. In contrast, February is generally colder, with temperatures dipping lower, featuring a minimum of -4°C (25°F), an average of 6°C (43°F), and a maximum of 14°C (58°F). February experiences more precipitation, totaling 88 mm (3.5 in) across 16 days, while maintaining the same high humidity level of 86%. For more details, you can check out Kilkenny weather in February.

September and March in Kilkenny showcase contrasting weather patterns. In September, temperatures range from a chilly minimum of -1°C (31°F) to a pleasant average of 13°C (56°F), peaking at a warm 25°C (78°F). The month sees a total precipitation of 61 mm (2.4 in) over 11 days, with humidity at a steady 86%. In contrast, March experiences colder temperatures, with a minimum of -8°C (17°F) and an average of 6°C (44°F), reaching a maximum of 17°C (63°F). The precipitation increases to 79 mm (3.1 in) over 15 days while maintaining the same humidity level of 86%. For a detailed look at the weather specifics for March, visit Kilkenny weather in March.

September and April showcase distinct weather patterns, reflecting the transition between seasons. In September, temperatures typically vary from a chilly minimum of -1°C (31°F) to a warmer maximum of 25°C (78°F), with an average around 13°C (56°F). The month experiences about 61 mm (2.4 in) of precipitation across 11 days, coupled with high humidity levels of 86%. Conversely, April features cooler temperatures, with a minimum of -3°C (26°F) and a maximum of 20°C (69°F), resulting in an average temperature of 8°C (47°F). Precipitation in April is slightly lower at 57 mm (2.2 in), also spread over 11 days, and maintains a similar humidity level of 85%. For more details on the weather in Kilkenny during April, check out Kilkenny weather in April.

When comparing the weather in September and May, we observe some notable differences and similarities. September features a slightly warmer average temperature of 13°C (56°F), with maximums reaching up to 25°C (78°F), while May has a lower average of 11°C (52°F) and maximums of 23°C (74°F). Interestingly, both months experience precipitation over 11 days, with September totaling 61 mm (2.4 in) and May slightly higher at 65 mm (2.5 in). Humidity levels are comparable as well, with September at 86% and May at 83%. For more detailed insights about May, you can visit Kilkenny weather in May.

When comparing the weather in September and June, September tends to be cooler, with average temperatures ranging from a minimum of -1°C (31°F) to a maximum of 25°C (78°F), while June has slightly warmer temperatures, with a minimum of 4°C (39°F) and a maximum of 28°C (83°F). Both months experience similar levels of precipitation, with September receiving 61 mm (2.4 in) over 11 days and June slightly more at 65 mm (2.6 in) over 12 days. Humidity levels are comparable too, sitting at 86% in September and 85% in June. For more details, check out Kilkenny weather in June.

In comparing the weather of September and July, September experiences cooler temperatures overall, with a minimum of -1°C (31°F) and an average of 13°C (56°F), contrasting with July's milder minimum of 5°C (41°F) and average of 16°C (61°F). While both months share similar humidity levels at 86%, September generally has a maximum temperature of 25°C (78°F), slightly lower than July's maximum of 28°C (82°F). Precipitation is also comparable, with September recording 61 mm (2.4 in) over 11 days, just a bit less than July's 67 mm (2.6 in) across 12 days. For more detailed insights, you can check Kilkenny weather in July.

In comparing the weather between September and August, September experiences a broader temperature range, with minimums dipping as low as -1°C (31°F) and maximums reaching up to 25°C (78°F). In contrast, August maintains a milder temperature profile, with minimums at 5°C (41°F) and maximums at 24°C (76°F). While September records an average temperature of 13°C (56°F), slightly cooler than August's average of 15°C (59°F), it also sees a reduction in total precipitation, measuring 61 mm (2.4 in) over 11 days compared to August's 91 mm (3.6 in) over 15 days. Both months exhibit high humidity levels, with September at 86% and August slightly lower at 85%. For more detailed information on August weather, visit Kilkenny weather in August.

September and October in Kilkenny showcase a noticeable transition in weather patterns as autumn progresses. September tends to be milder with an average temperature of 13°C (56°F) and highs reaching up to 25°C (78°F), while October experiences cooler conditions, averaging around 10°C (51°F) with maximums of only 19°C (66°F). Precipitation also increases in October, totaling 85 mm (3.4 in) over 14 days compared to September’s 61 mm (2.4 in) over 11 days. Both months exhibit high humidity, with October slightly more humid at 87%. For more detailed information, check out Kilkenny weather in October.

Comparing the weather in September and November reveals distinct changes as autumn deepens. In September, temperatures range from a mild minimum of -1°C (31°F) to a warm maximum of 25°C (78°F), with an average of 13°C (56°F). The month experiences around 61 mm (2.4 inches) of precipitation over approximately 11 days, along with relatively high humidity at 86%. By November, the weather becomes noticeably cooler, with minimums dropping to -3°C (28°F) and an average temperature of 7°C (46°F). Maximum temperatures are more subdued, peaking at 15°C (60°F). Precipitation increases to 85 mm (3.3 inches) across 13 days, maintaining the humidity at 86%. This shift illustrates the transition from early autumn warmth to the chillier, wetter conditions typical of late fall. For more details, check out Kilkenny weather in November.

In September, weather conditions are notably milder, with average temperatures around 13°C (56°F) and maximums reaching up to 25°C (78°F). The month experiences less precipitation, with 61 mm (2.4 in) falling across 11 days, while humidity levels remain high at 86%. In contrast, December brings a chillier climate, featuring an average temperature of 6°C (44°F) and maximums cap at 14°C (57°F). The month is wetter, seeing about 101 mm (4.0 in) of rain over 15 days, and humidity levels slightly decrease to 84%. For more information on the weather in December, you can check Kilkenny weather in December.

Compare Kilkenny's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kilkenny

September in Kilkenny offers a unique blend of transitioning weather that sets it apart from the summer months. With temperatures gradually cooling from the warmer highs of August, the average dips to a comfortable level, while crisp mornings hint at the approaching autumn. Rainfall becomes more frequent, contributing to the landscape's lush vibrancy, yet the lingering humidity maintains a touch of summer's warmth. This combination of milder temperatures and increased precipitation makes September a dynamic month for exploring Kilkenny's rich culture and stunning scenery. For a more in-depth look at the overall weather patterns, check out Kilkenny Climate.