September Weather in Lisburn, United Kingdom

Last updated: March 17, 2025

September in Lisburn, United Kingdom unveils a transitional weather pattern as summer slowly fades into autumn. With a maximum temperature reaching 21°C (71°F), the days can still feel pleasantly warm, while the average temperature hovers around a mild 13°C (56°F). Nighttime brings a noticeable chill, dipping to a minimum of 4°C (39°F). Residents and visitors alike will need to prepare for frequent rainfall, as the city experiences an average of 75 mm (3.0 in) of precipitation over 15 days, contributing to a rather humid atmosphere with 88% humidity. Embrace the charm of Lisburn's early autumn weather, where cozy layers and the occasional umbrella are essential companions.

September Temperature in Lisburn

As September rolls into Lisburn, the transition from summer to autumn is palpable, reflected in the temperature shifts throughout the month. With minimums reaching 4°C (39°F) and averages around 13°C (56°F), the season brings a noticeable chill compared to the warm days of August. The maximum temperature peaks at a comfortable 21°C (71°F), offering a final taste of summer's warmth before the cooler months set in. This gradual decline in temperature marks a gentle shift in the landscape, as mornings become crisper and evenings cooler, inviting residents and visitors alike to enjoy the charming array of autumn colors that begin to emerge. The overall trend hints at a cozy transition, making September a delightful time to experience Lisburn's rich natural beauty.

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

The chart illustrates September temperature patterns in Lisburn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424344475257605956514744
Data source: Temperature data for Lisburn 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 Lisburn

September in Lisburn, United Kingdom, brings a moderate shift in precipitation patterns, with an average rainfall of 75 mm (approximately 3.0 inches) spread over 15 days. This month echoes the wetness of August, known for its heavier downpours, yet it offers a slight reprieve as the weather begins to transition into autumn. Compared to the earlier months, such as April's low 45 mm, September's rainfall indicates a resurgence of moisture, foreshadowing the wetter months ahead. As the days shorten and the greenery shifts toward autumn hues, Lisburn's September rainfall serves as a reminder of the approaching seasonal change while still holding on to the remnants of summer's warmth.

September Precipitation Trends in Lisburn

The chart displays monthly precipitation patterns in Lisburn, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6089804566788411575929491
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lisburn

As September arrives in Lisburn, the humidity tends to climb slightly, reaching 88%, making it one of the more humid months of the year. This increase from August's 86% marks a continuation of a general trend observed throughout the summer. Notably, the humidity peaks in October at 89%, suggesting that the wet autumn months are just around the corner. The journey through the year shows a progressive pattern, with humidity levels steadily rising from a low of 82% in May, creating a notable shift towards a damper climate as the seasons transition. As Lisburn moves into the fall, residents can expect a humid atmosphere that persists through November, crowned by the year's highest average humidity of 90%.

September Average Humidity in Lisburn

This chart illustrates the average monthly humidity levels in Lisburn, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lisburn

As September arrives in Lisburn, the UV Index settles at a moderate 5, suggesting it's time to enjoy the outdoors while still taking some precautions. After the intense summer months of very high UV ratings in June and July, which saw burn times as brief as 15 minutes, September offers a slight reprieve with a burn time of 30 minutes. Though the index dips from August's high 6, the need for sun protection remains. This trend of moderation continues into October, where the UV Index decreases to 3. Whether you're soaking in the early autumn sunshine or planning weekend outings, be sure to stay informed and protect your skin. For detailed insights, visit the Lisburn UV Index.

Maximum UV Index Levels in Lisburn for September

The chart shows the monthly maximum UV Index (UVI) for Lisburn 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578865321
Data source: Lisburn 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 Lisburn

As September arrives in Lisburn, the days still bask in a generous 295 hours of sunshine, marking a gentle transition from the vibrant warmth of summer to the cooler embrace of autumn. This month reflects a notable decline in sunlight compared to the peak offerings of June and July, each boasting nearly 400 hours. Yet, September's golden hours remain pleasantly abundant when compared to the winter months ahead, particularly November and December, where sunshine dips to a mere 115 and 87 hours respectively. This trend underscores the lingering delight of early autumn, providing ample opportunity to savor the fading warmth before the shorter days set in.

Monthly Sunshine Duration in Lisburn: September Highlighted

The September sunshine duration represents the total number of hours Lisburn 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.
JanFebMarAprMayJunJulAugSepOctNovDec81h150h209h322h403h394h399h349h295h232h115h87h
Data source: Lisburn September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Lisburn During September

In Lisburn, the likelihood of sunny weather in September is somewhat modest, with a 20% chance of sunshine. This figure aligns closely with the summer months, where July offers a slightly better 30%, while August dips to 21%. Interestingly, September's chances reflect a broader trend of fluctuating sunshine throughout the year; following the more promising spring months of April and May, which boast 42% and 33% respectively, there is a noticeable decline as autumn approaches. As temperatures begin to drop, the sunny days of September serve as a final, albeit limited, opportunity for outdoor enjoyment before the gloomier months set in. Overall, while sunshine may be scarce, September still holds a glimmer of brightness amid the changing seasons.

Percentage of Sunny Days in September in Lisburn

The chart illustrates the percentage of sunny days in Lisburn 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 Lisburn experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%23%20%42%33%23%30%21%20%18%20%14%
Data source: Lisburn September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Lisburn in September

As September arrives in Lisburn, the days begin to shorten, with 12 hours of daylight illuminating the landscape. This marks a gentle decline from the 14 hours enjoyed in August, as the vibrant summer fades. The transition towards autumn becomes evident, as daylight diminishes more significantly in the upcoming months, dropping to 10 hours in October and further to 8 hours in November. September's balance of daylight still offers a respite, showcasing the tail end of the longer days that characterize the summer months, before the brisk approach of winter settles in. This gradual reduction highlights the cyclical rhythm of seasonal change, inviting residents to relish the remaining warmth and brightness of early autumn.

Average Daylight Hours in Lisburn for September

The chart illustrates the variation in daylight duration in Lisburn throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 56m9h 44m11h 54m14h 7m16h 5m17h 7m16h 34m14h 47m12h 38m10h 26m8h 27m7h 21m
Data source: Lisburn daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Lisburn

As September unfolds in Lisburn, the wind whispers gently, with an average speed of 3.4 m/s (8 mph)—a subtle drop from the summer's more spirited breezes. This month marks a transitional phase, where the fading warmth of August and the approaching chill of autumn gracefully intertwine. Compared to the quieter July, known for its calm winds at just 2.6 m/s, September experiences a modest uptick in wind activity, yet it remains significantly milder than the gustier months like February and November, which boast averages of 6.2 m/s (14 mph) and 5.0 m/s (11 mph), respectively. This gentle autumnal wind sets the stage for cozy evenings and the vibrant hues of the season, inviting both residents and visitors to savor the beauty of Lisburn as it shifts into fall.

Average September Wind Speed in Lisburn

The chart displays monthly wind speed patterns in Lisburn, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.36.24.83.53.93.82.63.23.4 m/s4.75.04.9
Data source: Lisburn September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Lisburn Compares to Other Months

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

In comparing the weather between September and January, we see a notable shift in temperatures. September features a milder range, with minimums around 4°C (39°F) and maximums reaching up to 21°C (71°F), offering an average temperature of 13°C (56°F). In contrast, January experiences colder conditions, with minimum temperatures dropping to -4°C (26°F) and maximums only reaching 14°C (57°F), resulting in a lower average of 6°C (43°F). Additionally, September is characterized by higher humidity at 88% and more precipitation days (15), while January maintains slightly less humidity at 87% with fewer precipitation days (10). For a more detailed overview of January weather, you can visit Lisburn weather in January.

When comparing the weather in September and February, September tends to be milder with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (71°F), whereas February is colder, featuring temperatures from a minimum of -2°C (28°F) to a maximum of 13°C (56°F). September experiences an average temperature of 13°C (56°F) while February's average is lower at 6°C (43°F). Additionally, both months have similar levels of precipitation, with September receiving 75 mm (3.0 in) over 15 days and February having 89 mm (3.5 in) over 14 days. Humidity levels are comparable as well, with September at 88% and February slightly lower at 86%. For more detailed information about February weather specifically in Lisburn, you can check out Lisburn weather in February.

When comparing the weather in September and March, several notable differences emerge. September tends to be milder, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (71°F), while March experiences cooler temperatures, with a low of -3°C (27°F) and a high of 16°C (60°F). Precipitation levels are somewhat similar, with September receiving 75 mm (3.0 in) over 15 days and March slightly higher at 80 mm (3.2 in) over 16 days. Additionally, the humidity in both months remains high, at 88% for September and 86% for March. For those interested in a more detailed look at March weather in Lisburn, you can check out Lisburn weather in March.

September typically experiences milder temperatures compared to April, with averages around 13°C (56°F) and maximums reaching 21°C (71°F), while April's temperatures range from a chilly -1°C (31°F) to a comfortable 18°C (65°F). Precipitation levels are higher in September, with about 75 mm (3.0 in) falling over 15 days, compared to April's 45 mm (1.8 in) over 10 days. Humidity remains relatively high in both months, with September at 88% and April slightly lower at 85%. For further details on weather conditions during April, you can check out Lisburn weather in April.

September and May present distinct weather patterns, each with its own characteristics. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 21°C (71°F), averaging around 13°C (56°F). The month sees a fair amount of rainfall, with 75 mm (3.0 in) over approximately 15 days, accompanied by relatively high humidity at 88%. In contrast, May tends to be slightly cooler, with temperatures ranging from 1°C (34°F) to 22°C (71°F) and an average of 11°C (52°F). Rainfall is less intense, totaling 66 mm (2.6 in) across about 13 days, and the humidity is slightly lower at 82%. For a closer look at the weather specifics, check out Lisburn weather in May.

When comparing the weather in September and June, we notice some distinct differences. September typically starts cooler, with average temperatures ranging from a low of 4°C (39°F) to a high of 21°C (71°F), while June enjoys slightly warmer conditions with temperatures varying from 6°C (43°F) to a maximum of 26°C (79°F). In terms of precipitation, September sees a total of 75 mm (3.0 in) over approximately 15 days, making it a rainy month, whereas June has a similar level of precipitation at 78 mm (3.1 in) spread over 14 days. Humidity levels also vary slightly, with September being a bit more humid at 88% compared to June's 84%. For more detailed weather information, you can check Lisburn weather in June.

When comparing the weather in September and July, it's clear that September tends to be cooler, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (71°F). In contrast, July offers warmer conditions, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 26°C (78°F). Additionally, September experiences higher humidity levels at 88%, compared to July's 86%. Precipitation is slightly more frequent in September, with 75 mm (3.0 in) falling over 15 days, while July records 84 mm (3.3 in) of rainfall over 14 days. For more details, check out Lisburn weather in July.

September weather in Lisburn shows a noticeable shift compared to August. With minimum temperatures dropping to 4°C (39°F) and an average of 13°C (56°F), September is significantly cooler than August, where temperatures range from a minimum of 8°C (46°F) to an average of 15°C (59°F). While the maximum temperatures in both months are similar, September tends to be a wetter month, receiving 75 mm (3.0 in) of precipitation over 15 days, compared to August's 115 mm (4.5 in) spread over 19 days. Additionally, September has a slightly higher humidity at 88%, compared to August's 86%. For more detailed insights into August weather in Lisburn, you can visit Lisburn weather in August.

In September, the weather is relatively mild with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (71°F), and an average of 13°C (56°F). The month experiences about 75 mm (3.0 in) of precipitation over 15 days, coupled with a high humidity level of 88%. In contrast, October brings cooler temperatures, with a minimum of 1°C (35°F) and a maximum of 18°C (65°F), averaging 11°C (52°F). Additionally, October sees an increase in precipitation to 92 mm (3.6 in), across the same number of rainy days, while humidity slightly rises to 89%. For more specific weather details, you can check Lisburn weather in October.

September weather tends to be milder with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (71°F), while November is notably cooler, with averages between 0°C (32°F) and 15°C (59°F). Both months experience similar levels of precipitation, with September receiving 75 mm over 15 days and November slightly higher at 94 mm across the same number of days. Humidity levels remain high during both months, with September at 88% and November slightly increasing to 90%. For more specific details about November weather, you can check this link: Lisburn weather in November.

In September, the weather is generally milder, with temperatures ranging from a chilly 4°C (39°F) at night to a comfortable 21°C (71°F) during the day, and an average of 13°C (56°F). The month also sees about 75 mm (3.0 in) of precipitation spread over 15 days, accompanied by high humidity levels at 88%. In contrast, December brings colder temperatures, with a minimum of -1°C (30°F) and a maximum of 13°C (56°F), averaging around 6°C (44°F). Precipitation increases slightly to 91 mm (3.6 in), also over 15 days, but humidity remains relatively stable at 86%. The shift from September to December marks a transition from pleasantly mild conditions to much colder, wetter weather. For more insights on December conditions, check Lisburn weather in December.

Compare Lisburn's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Lisburn

As September unfolds in Lisburn, the weather begins to transition from the warm embrace of summer to the cooler nuances of autumn. With mild average temperatures and a notable rise in precipitation days, this month contrasts sharply with the drier and warmer months of June and July. The humidity lingers at a high level, contributing to a somewhat damp and cooler atmosphere that sets the stage for changing foliage and cozy evenings. If you're curious about the broader patterns and nuances of Lisburn's climate, explore more at Lisburn Climate.