September Weather in Llansteffan, United Kingdom

Last updated: March 17, 2025

September in Llansteffan, United Kingdom, brings a medley of weather experiences, showcasing a maximum temperature that can reach a pleasant 25°C (77°F). On average, daytime highs hover around 15°C (59°F), while nighttime lows dip to a refreshing 6°C (43°F). With 106 mm (4.2 in) of rain falling over approximately 15 days, this month witnesses a significant amount of precipitation, contributing to the lush, green landscapes the region is known for. Coupled with a humidity level of 79%, visitors should be prepared for a mix of mild warmth and occasional showers, making September a uniquely vibrant time to explore Llansteffan.

September Temperature in Llansteffan

In September, Llansteffan experiences a pleasant transition into autumn, with temperatures showcasing a combination of lingering summer warmth and the chill of the approaching season. The average temperature rests at 15°C (59°F), with daytime highs reaching a comfortable 25°C (77°F), perfect for enjoying the stunning coastal scenery. Evenings cool down to around 6°C (43°F), allowing for refreshing breezes that complement the golden hues of fall. As the month progresses, day lengths shorten and the air starts to carry a hint of crispness, marking a distinctive shift from the balmy summer months of July and August. Overall, September serves as a beautiful bridge between the vibrant warmth of summer and the cool embrace of autumn in this charming UK locale.

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

The chart illustrates September temperature patterns in Llansteffan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec444445495359626158544946
Data source: Temperature data for Llansteffan 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 Llansteffan

In September, Llansteffan experiences a remarkable blend of summer's lingering warmth and the onset of autumn's embrace. With an average precipitation of 106 mm (4.2 inches) spread over 15 days, the month continues the trend of relatively high rainfall that began in August, which recorded the highest amount of the year at 126 mm (5.0 inches). This increase in wet days hints at the shifting seasons, as colder months are just around the corner, leading into October's peak rainfall of 152 mm (6.0 inches). Despite the damp conditions, the vibrant scenery of this coastal village thrives, showcasing the lush greenery that the regular rains support, making September a significant transitional month in Llansteffan's weather cycle.

September Precipitation Trends in Llansteffan

The chart displays monthly precipitation patterns in Llansteffan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8912010659839684126106152143165
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llansteffan

In September, Llansteffan experiences a moderate drop in humidity, with levels sitting at 79%. This month marks a transitional phase, as the summer's peak humidity of 73% in August gives way to the cooler, more humid autumn months ahead. Over the year, the humidity generally tends to be at its highest in the winter and late autumn, with January and October peaking at 88%. Notably, from July to August, there is a significant decrease, reflecting the summer's relatively drier conditions. As September wraps up, the landscape prepares for the return of higher moisture levels, gradually inching back towards the 90% range of the late fall and winter months.

September Average Humidity in Llansteffan

This chart illustrates the average monthly humidity levels in Llansteffan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Llansteffan

As September rolls in Llansteffan, the UV Index settles at 6, marking a transition towards high exposure levels. This is a slight dip from the peak summer months of July and August, which saw very high indices, yet the risk remains notable. With a burn time of just 25 minutes, it's essential to stay vigilant about sun protection, especially during peak hours. As the days shorten and temperatures cool, the UV Index begins to mirror its early spring levels, but September's sun can still be quite potent. For more detailed insights and to stay safe in the sun, visit Llansteffan UV Index.

Maximum UV Index Levels in Llansteffan for September

The chart shows the monthly maximum UV Index (UVI) for Llansteffan 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.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Llansteffan 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 Llansteffan

In Llansteffan, United Kingdom, September brings a delightful burst of sunshine, with 313 hours of glorious daylight, a continuation of the summer warmth that peaks in July at 422 hours. As the year progresses, sunshine hours gradually start to decline, yet September remains vibrant compared to the winter months, where sunlight dips sharply to just 114 hours in December. This month reflects a transition as autumn settles in, offering a beautiful blend of late summer brightness and the crisp charm of the upcoming fall. The overall trend showcases a distinct seasonal rhythm, highlighting Llansteffan's charm in harnessing the remaining rays before the shorter days of autumn take hold.

Monthly Sunshine Duration in Llansteffan: September Highlighted

The September sunshine duration represents the total number of hours Llansteffan 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.
JanFebMarAprMayJunJulAugSepOctNovDec97h157h229h341h409h401h422h379h313h245h138h114h
Data source: Llansteffan September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Llansteffan During September

In Llansteffan, United Kingdom, the likelihood of sunny weather in September stands at 27%, mirroring the typically modest probabilities seen earlier in the year. This figure reflects a trend where the chances of sunlight fluctuate, peaking in spring with April at 52%, and then gradually declining as autumn approaches. Following the vibrant summer months, September's sunshine potential dips slightly, reminiscent of the overcast conditions that dominate the later months, such as October with just 20%. Overall, while September still offers glimpses of sun, it signals the transition away from the brighter days of summer towards the more subdued weather patterns of fall.

Percentage of Sunny Days in September in Llansteffan

The chart illustrates the percentage of sunny days in Llansteffan 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 Llansteffan experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%24%30%52%33%27%40%35%27%20%24%22%
Data source: Llansteffan September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Llansteffan in September

As summer fades into autumn, September in Llansteffan witnesses a gentle decline in daylight hours, with 12 hours of sunlight greeting residents. This marks a noticeable shift from the peak of 16 hours during the sun-soaked months of June and July. As the days shorten, the charm of early autumn sets in, revealing the cozy ambiance of this coastal town. Following September, daylight hours will dwindle further, reaching 10 hours in October and tapering to 8 hours by November, reminding us of the cycle of seasons that shapes the character of Llansteffan.

Average Daylight Hours in Llansteffan for September

The chart illustrates the variation in daylight duration in Llansteffan throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 22m9h 57m11h 55m13h 55m15h 40m16h 35m16h 5m14h 31m12h 35m10h 35m8h 48m7h 51m
Data source: Llansteffan daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Llansteffan

In Llansteffan, September brings a gentle breeze with an average wind speed of 4.0 m/s (9 mph), mirroring the calm of the preceding summer months. As the year transitions into autumn, the winds start to pick up slightly, laying the groundwork for the sharper gusts that characterize October. Throughout the year, a noticeable trend emerges: winter months like January and December see higher wind speeds averaging over 6 m/s, while the sultry summer months of July and August present the mildest conditions, often dipping below 4 m/s. Overall, September serves as a tranquil bridge, where the softer winds hint at the impending changes of the season.

Average September Wind Speed in Llansteffan

The chart displays monthly wind speed patterns in Llansteffan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.66.75.74.15.24.03.64.64.0 m/s6.15.16.4
Data source: Llansteffan September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Llansteffan Compares to Other Months

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

In September, the weather is generally milder, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), and an average of 15°C (59°F). This month experiences about 106 mm (4.2 in) of precipitation over approximately 15 days, accompanied by a humidity level of 79%. In contrast, January brings much colder conditions, with temperatures ranging from a minimum of -2°C (29°F) to a maximum of 14°C (57°F), averaging around 7°C (44°F). Although January sees slightly less precipitation at 89 mm (3.5 in) over 13 days, it has a higher humidity level of 88%. For more detailed insights, you can check Llansteffan weather in January.

September and February present quite different weather climates. In September, temperatures range from a mild 6°C (43°F) at night to a pleasant 25°C (77°F) during the day, with an average of 15°C (59°F). The month sees about 106 mm (4.2 in) of precipitation over approximately 15 days, and humidity levels hover around 79%. In contrast, February experiences cooler conditions, with minimum temperatures dropping to -2°C (28°F) and maximums reaching only 14°C (57°F). The average temperature is a brisk 7°C (45°F), and while precipitation is slightly higher at 120 mm (4.7 in) over 16 days, humidity is also greater at 88%. For a detailed outlook on February weather in Llansteffan, you can check Llansteffan weather in February.

When comparing the weather of September and March, notable differences emerge. September boasts a milder temperature range, with average highs reaching 25°C (77°F) and lows around 6°C (43°F), making it a pleasant month for outdoor activities. In contrast, March is characterized by cooler temperatures, with maximums only up to 16°C (60°F) and minimums dropping to -5°C (24°F). Both months receive similar amounts of precipitation, approximately 106 mm (4.2 in), but March tends to have a slightly higher number of rainy days at 17 compared to September’s 15. Additionally, March experiences higher humidity levels at 86%, compared to September's 79%. For more detailed insights on March weather, visit Llansteffan weather in March.

When comparing the weather in September and April, a noticeable difference in temperatures and precipitation emerges. September enjoys a milder climate with average temperatures ranging from 15°C (59°F) to a maximum of 25°C (77°F), while April experiences cooler averages of 9°C (49°F) and peaks at 19°C (66°F). Additionally, September tends to be wetter, with 106 mm (4.2 in) of rain over 15 days compared to April’s 59 mm (2.3 in) over 10 days. Humidity levels are also quite similar, being slightly higher in April at 84% versus 79% in September. For a closer look at the specifics, you can find more details at Llansteffan weather in April.

When comparing the weather in September and May, we see notable differences in temperature and precipitation patterns. September generally offers a wider temperature range, with minimums around 6°C (43°F) and maximums reaching 25°C (77°F), resulting in an average of 15°C (59°F). In contrast, May is cooler, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 22°C (72°F) and an average of 12°C (53°F). Additionally, September experiences higher precipitation levels, totaling 106 mm (4.2 in) over about 15 days, while May receives 83 mm (3.3 in) across approximately 12 days. The humidity remains relatively consistent, with September at 79% and May slightly higher at 80%. For more detailed information, you can check this link: Llansteffan weather in May.

September and June in Llansteffan have similarly mild average temperatures, both hovering around 15°C (59°F), but September tends to show a slightly cooler minimum temperature of 6°C (43°F) compared to June's 8°C (47°F). Precipitation levels are fairly comparable, with September receiving 106 mm (4.2 in) over 15 days, while June has slightly less at 96 mm (3.8 in) over the same number of days. Humidity is also quite similar, with September sitting at 79% and June at 80%. For a more detailed look at June's specific weather patterns, check out Llansteffan weather in June.

When comparing the weather of September to July, we see notable differences in temperature and precipitation. September offers a cooler average temperature, ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), while July's temperatures are slightly warmer, with a minimum of 9°C (49°F) and a maximum of 26°C (78°F). Additionally, September experiences higher precipitation at 106 mm (4.2 in) over 15 days, compared to July's 84 mm (3.3 in) over 13 days. The humidity also tends to be higher in September at 79%, versus July's 70%. For more detailed insights on July weather, you can refer to Llansteffan weather in July.

In comparing the weather between September and August, it is clear that September experiences cooler temperatures, with a minimum of 6°C (43°F) compared to August's 10°C (50°F). Both months have a maximum temperature of 25°C (77°F) but September’s average temperature is slightly lower at 15°C (59°F) versus August’s 16°C (61°F). Additionally, September tends to be more humid, with an average humidity of 79% compared to 73% in August. Precipitation is also prominent in both months, with September receiving 106 mm (4.2 in) over 15 days and August slightly wetter with 126 mm (5.0 in) over 17 days. For a closer look at August weather specifics, you can check Llansteffan weather in August.

In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), with an average of 15°C (59°F). The month sees about 106 mm (4.2 in) of precipitation over 15 days, accompanied by a humidity level of 79%. In contrast, October ushers in cooler conditions, featuring a minimum temperature of 0°C (33°F), an average of 12°C (54°F), and a maximum of 20°C (68°F). The precipitation increases to 152 mm (6.0 in) over 17 days, coupled with a higher humidity rate of 89%. Overall, October is characterized by chillier temperatures and increased rainfall compared to September. For more detailed insights, visit Llansteffan weather in October.

In comparing the weather of September and November, we see a notable drop in temperatures and an increase in precipitation. September boasts a mild range, with temperatures averaging 15°C (59°F) and peaking at 25°C (77°F), while November's temperatures dip significantly, averaging just 9°C (49°F) and reaching a maximum of 15°C (60°F). Additionally, November experiences more frequent rain, with 143 mm (5.6 in) of precipitation over 19 days, compared to September’s 106 mm (4.2 in) over 15 days. Humidity levels also rise in November, reaching 90%, a stark contrast to September's 79%. For more details, you can check Llansteffan weather in November.

In September, the weather in Llansteffan is relatively mild, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), making it a great time for outdoor activities. However, it does see a fair amount of rainfall with 106 mm (4.2 in) spread over about 15 days and a humidity level of 79%. In contrast, December brings colder conditions, with temperatures dropping significantly to a range of 0°C (32°F) to 13°C (55°F) and an increase in precipitation to 165 mm (6.5 in) across 20 days. Humidity also rises to 89%, contributing to a more damp and chilly atmosphere. For a closer look at December weather specifics, visit Llansteffan weather in December.

Compare Llansteffan's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Llansteffan

As September unfolds in Llansteffan, the weather showcases a charming transition from the warmth of summer to the crispness of autumn. With average temperatures around a mild 15°C, it's a time when the lingering summer days can still peak at a pleasant 25°C, inviting outdoor activities and scenic strolls. However, this month also introduces increased rainfall, with about 15 days of precipitation contributing to a total of 106 mm, making it noticeably wetter than the preceding summer months. Coupled with a humidity level hovering around 79%, September offers a refreshing, albeit changeable, climatic experience. For more insights into the seasonal patterns, check out Llansteffan Climate.