September Weather in Llandeilo, United Kingdom

Last updated: March 17, 2025

September in Llandeilo, United Kingdom is characterized by a diverse climate experience, with maximum temperatures soaring to 27°C (81°F) while the average hovers around a mild 13°C (56°F). The month begins with the chill of early autumn, where temperatures can dip to a brisk 1°C (33°F) at night. Precipitation, frequent throughout the month, totals 110 mm (4.3 in) over approximately 14 days, contributing to the region's lush greenery. Combined with an average humidity level of 79%, this month presents a unique blend of warm sunny days and cooler, damp nights, making September an intriguing time to explore the scenic beauty of Llandeilo.

September Temperature in Llandeilo

September in Llandeilo, United Kingdom, marks a gentle transition as summer sweetness lingers. With a minimum temperature of 1°C (33°F), the days start to cool down, yet the average hovers around a comfortable 13°C (56°F). The peak temperature can still hit 27°C (81°F), creating delightful moments reminiscent of warmer months. This month showcases a subtle decline in warmth, reflecting a shift towards autumn while still offering plenty of enjoyable milder days. As the landscape begins to transform with the changing season, September serves as a bridge, inviting residents and visitors alike to savor the last bits of summer's embrace before autumn fully descends.

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

The chart illustrates September temperature patterns in Llandeilo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414243475258615956514543
Data source: Temperature data for Llandeilo 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 Llandeilo

In September, Llandeilo experiences a notable transition as summer gives way to autumn, reflected in its precipitation patterns. With an average of 110 mm (4.3 in) of rainfall across 14 days, this month balances both the warmth of late summer and the increasing tendency toward wetter weather. Compared to the heavier downpours of August, which saw 133 mm (5.2 in) over 20 days, September's rainfall is slightly less abundant yet still significant. This slight dip indicates a shift toward the cooler months ahead, setting the stage for the more substantial rainfall that October typically brings, with an average of 155 mm (6.1 in) anticipated. Overall, September in Llandeilo illustrates a wetter atmosphere, signaling the need for umbrellas as days grow shorter and the season shifts.

September Precipitation Trends in Llandeilo

The chart displays monthly precipitation patterns in Llandeilo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec951401256699103101133110155132166
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llandeilo

In September, Llandeilo experiences a noticeable dip in humidity, with levels averaging 79%, a decline from the summer months. This shift marks a transition from the often sultry conditions of July and August, when humidity peaked at 70% and 73%, respectively. As autumn approaches, the air becomes more refreshing, yet it remains notably higher than the spring months, where humidity hovered around 84% to 86%. The trend indicates an overall increase in moisture as the year progresses, with October and November bringing even higher humidity levels, reaching 89% and 90%. This pattern showcases the unique climate of Llandeilo, where the shift from summer to autumn is characterized by a comforting, yet slightly damp, ambiance.

September Average Humidity in Llandeilo

This chart illustrates the average monthly humidity levels in Llandeilo, 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 Llandeilo

As September arrives in Llandeilo, the UV Index stands at 6, placing it in the high exposure category. This indicates that while the risk of harm from unprotected sun exposure is significant, it's slightly lower than the peak of summer months. With a burn time of just 25 minutes, it’s essential for residents and visitors alike to remain mindful and use sun protection, especially during midday hours. This shift from the more intense UV levels of July and August signifies a gradual transition towards autumn, yet the sun's rays can still be potent. Embracing the beautiful September days in Llandeilo is delightful, but don't forget to check the UV forecast for safe sun enjoyment. For more insights on sun exposure in the area, visit Llandeilo UV Index.

Maximum UV Index Levels in Llandeilo for September

The chart shows the monthly maximum UV Index (UVI) for Llandeilo 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: Llandeilo 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 Llandeilo

As summer wanes and autumn approaches, September in Llandeilo, United Kingdom, boasts a satisfying 304 hours of sunshine, making it one of the sunniest months of the year. Following the peak brightness of July, which shines for an impressive 412 hours, September still retains a generous amount of sunlight compared to the preceding months. This transitional month reflects a gradual decline in daylight as it shifts from the 400 hours of May to the cooler days of October, which sees only 232 hours. The enduring warmth of early autumn can be felt in the golden hues of the landscape, compelling locals and visitors alike to savor the last vestiges of sunshine before the shorter days of winter set in.

Monthly Sunshine Duration in Llandeilo: September Highlighted

The September sunshine duration represents the total number of hours Llandeilo 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.
JanFebMarAprMayJunJulAugSepOctNovDec89h144h212h324h400h386h412h369h304h232h126h101h
Data source: Llandeilo September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Llandeilo During September

In Llandeilo, September sees a 23% chance of sunny weather, which reflects a subtle decline following the summer months. This likelihood is slightly below the brighter springtime peak of 52% in April and is comparable to the sunnier spells of August and November. As the seasons shift, the chance of sunshine dips, suggesting that while September retains a hint of summer's warmth, preparing for a mix of weather is wise. Observing these trends reveals that Llandeilo experiences more favorable conditions earlier in the year, with the chances of sunny days diminishing as autumn settles in.

Percentage of Sunny Days in September in Llandeilo

The chart illustrates the percentage of sunny days in Llandeilo 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 Llandeilo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%19%26%52%27%24%35%28%23%16%23%19%
Data source: Llandeilo September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Llandeilo in September

As summer gracefully transitions into autumn, September in Llandeilo, United Kingdom, offers a delightful shift in daylight duration, providing about 12 hours of light each day. This marks a gradual decline from the sun-soaked 16 hours experienced in the height of summer, reflecting the natural rhythm of the seasons. Just a month prior, August still basked in 14 hours of daylight, but September heralds the beginning of shorter days, reminiscent of spring's awakening at 11 hours in March. Observing this pattern reveals a beautiful cycle of light, where each month signals subtle changes as we prepare for the cozy embrace of autumn and the eventual crispness of winter.

Average Daylight Hours in Llandeilo for September

The chart illustrates the variation in daylight duration in Llandeilo throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 18m9h 55m11h 54m13h 56m15h 43m16h 39m16h 9m14h 33m12h 35m10h 34m8h 46m7h 47m
Data source: Llandeilo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Llandeilo

As September unfolds in Llandeilo, the winds begin to whisper of change, with an average speed of 2.9 m/s (7 mph). This gradual decline marks a notable shift from the summer breezes, as the wind slows from the earlier months’ more dynamic gusts. Following a peak in February at 5.2 m/s (12 mph), the winds have steadily lessened throughout the summer, reaching their lowest point in September. This trend hints at the softening embrace of autumn, as the days slowly transition from the vibrant energy of summer to the crisp, cooler air of October, which typically sees a resurgence in wind speed to 4.4 m/s (10 mph). Embracing this rhythmic ebb and flow, Llandeilo’s September winds set the stage for the enchanting seasonal transformation ahead.

Average September Wind Speed in Llandeilo

The chart displays monthly wind speed patterns in Llandeilo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.05.24.33.13.93.22.73.52.9 m/s4.43.54.6
Data source: Llandeilo September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Llandeilo Compares to Other Months

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

In September, temperatures range from a cool 1°C (33°F) at night to a warm 27°C (81°F) during the day, with an average of 13°C (56°F). The month experiences about 110 mm (4.3 in) of precipitation spread over 14 days, and humidity sits at a comfortable 79%. In contrast, January brings much colder weather, with temperatures dropping to a minimum of -5°C (23°F) and only reaching a maximum of 13°C (55°F), averaging around 5°C (41°F). Precipitation slightly decreases to 95 mm (3.7 in) over 13 days, but humidity rises to 88%, making it feel colder. For a detailed look at January conditions, visit Llandeilo weather in January.

September and February present contrasting weather conditions in terms of temperature and precipitation. In September, temperatures range from a minimum of 1°C (33°F) to a maximum of 27°C (81°F), with an average of 13°C (56°F). The month experiences around 110 mm (4.3 in) of rainfall over approximately 14 days, coupled with a humidity level of 79%. In contrast, February is much colder, with temperatures ranging from a minimum of -9°C (16°F) to a maximum of 17°C (62°F) and an average temperature of 5°C (42°F). This month also sees increased precipitation, totaling 140 mm (5.5 in) over about 16 days, along with a higher humidity of 88%. For a more detailed look into February's weather, you can check Llandeilo weather in February.

September and March present contrasting weather patterns, with September generally being warmer and more stable. In September, temperatures range from a chilly 1°C (33°F) at night to a pleasant average of 13°C (56°F) during the day, peaking at 27°C (81°F). Conversely, March tends to be colder, with a minimum temperature of -7°C (20°F) and an average of 6°C (44°F), reaching a maximum of 19°C (66°F). Precipitation is relatively high in both months, with September receiving 110 mm (4.3 in) over about 14 days and March slightly higher at 125 mm (4.9 in) across 18 days. Furthermore, March is marked by higher humidity levels at 86%, compared to September's 79%. For a detailed look at March weather specifically, you can check Llandeilo weather in March.

September weather generally features warmer temperatures compared to April, with average highs reaching 27°C (81°F) while April peaks at 22°C (72°F). The minimum temperature in September is 1°C (33°F), slightly milder than April's minimum of -4°C (25°F). Additionally, September experiences more precipitation, with 110 mm (4.3 in) over 14 days, while April sees 66 mm (2.6 in) over 11 days. Humidity levels are relatively high in both months, with September at 79% and April slightly higher at 84%. For a detailed look at the weather in April, you can refer to Llandeilo weather in April.

In comparing the weather of September and May, we notice distinct differences in temperature and precipitation. September boasts a wider temperature range, with minimums reaching 1°C (33°F) and maximums hitting 27°C (81°F), while May experiences a slightly lower range, with minimums at -1°C (31°F) and maximums at 25°C (78°F). Both months see a similar amount of rainfall, with September receiving 110 mm (4.3 in) and May slightly less at 99 mm (3.9 in), each recorded over 14 days. Humidity levels are quite comparable as well, with September at 79% and May at 80%. For more information on May weather in Llandeilo, you can visit Llandeilo weather in May.

In comparing the weather of September and June, we see subtle differences in temperature and precipitation. September features a wider temperature range with a minimum of 1°C (33°F) and a maximum of 27°C (81°F), resulting in an average of 13°C (56°F). In contrast, June has milder temperatures, with a minimum of 4°C (39°F) and a maximum of 28°C (83°F), averaging around 14°C (58°F). Both months experience relatively similar precipitation levels, with September receiving 110 mm (4.3 in) over 14 days and June slightly lower at 103 mm (4.1 in) across 17 days. Humidity remains consistent, with September at 79% and June at 80%. For a closer look at the specifics of June weather, you can check this link: Llandeilo weather in June.

In comparing the weather between July and September, we observe notable differences in temperature and humidity. July generally experiences milder temperatures, with minimums around 5°C (41°F) and average highs reaching 28°C (83°F), while September cools down significantly, with minimums dropping to 1°C (33°F) and an average maximum of 27°C (81°F). Both months are relatively wet, with September seeing slightly more precipitation at 110 mm (4.3 in) over 14 days compared to July's 101 mm (4.0 in) over 16 days. Additionally, September has higher humidity levels at 79%, compared to July's more comfortable 70%. For a detailed look at July's weather, you can explore Llandeilo weather in July.

In comparing the weather between August and September, September experiences a notable drop in minimum temperatures, with a low of 1°C (33°F) compared to August's minimum of 5°C (42°F). The average temperatures in September are slightly cooler at 13°C (56°F), while August maintains a warmer average of 15°C (60°F). Interestingly, both months share the same maximum temperature of 27°C (81°F), indicating that warm days are still possible in September. However, September sees an increase in precipitation with 110 mm (4.3 in) over 14 days, while August has slightly more rain at 133 mm (5.2 in) over 20 days. Additionally, humidity levels rise in September to 79%, compared to 73% in August. For more details on August weather specifics, you can check Llandeilo weather in August.

September and October present distinct changes in weather patterns. In September, temperatures range from a minimum of 1°C (33°F) to a maximum of 27°C (81°F), with an average of 13°C (56°F). The month sees about 110 mm (4.3 in) of precipitation over 14 days, accompanied by a humidity level of 79%. In contrast, October brings cooler temperatures, with a minimum of -3°C (27°F) and a maximum of 21°C (70°F), averaging 10°C (51°F). Additionally, it experiences increased rainfall of 155 mm (6.1 in) over 17 days and a higher humidity level of 89%. For more insights into October weather specifics, you can check Llandeilo weather in October.

September marks the transition into autumn with temperatures ranging from a minimum of 1°C (33°F) to a maximum of 27°C (81°F), averaging around 13°C (56°F). This month experiences moderate rainfall, totaling 110 mm (4.3 in) over approximately 14 days, and a humidity level of 79%. In contrast, November brings cooler conditions, with temperatures dropping significantly; the minimum reaches -3°C (26°F), averaging 7°C (46°F) and a maximum of 15°C (59°F). Precipitation is slightly higher at 132 mm (5.2 in) across about 17 days, accompanied by increased humidity at 90%. For more detailed insights into November weather, visit Llandeilo weather in November.

In September, the weather is generally milder, with average temperatures ranging from a low of 1°C (33°F) to a high of 27°C (81°F) and a notable 14 days of precipitation totaling 110 mm (4.3 in). The humidity sits at a comfortable 79%, making for pleasant early autumn conditions. In contrast, December brings colder temperatures, with lows dipping to -4°C (26°F) and a modest average of 6°C (43°F), and highs reaching only 12°C (55°F). This month sees increased precipitation with 166 mm (6.5 in) falling over 20 days, alongside higher humidity at 89%, creating a distinctly wetter and chillier environment. For a closer look at the December weather specifics, you can visit Llandeilo weather in December.

Compare Llandeilo's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Llandeilo

As summer transitions into autumn, September in Llandeilo offers a unique blend of warmth and coolness that sets it apart from the other months. With an average temperature hovering around a comfortable 13°C (56°F), it provides a gentle reprieve from the heat, although the occasional peak can reach a pleasant 27°C (81°F). However, frequent rainfall, averaging around 110 mm over 14 days, brings a refreshing contrast to the drier summer season, resulting in an ambiance filled with rich, vibrant colors. The humidity levels remain comparatively high at 79%, adding to the season's crisp feel. For a detailed look at how Llandeilo's climate evolves throughout the year, visit Llandeilo Climate.