Last updated: March 17, 2025
In Carmarthen, United Kingdom, September brings a mix of mild temperatures and frequent rain. The month typically sees a maximum temperature of 25°C (78°F), alongside an average of 15°C (58°F), dipping down to a minimum of 5°C (42°F). With humidity levels at 79%, the weather can feel quite damp. Rainfall is notable, with 115 mm (4.5 in) of precipitation spread over 16 days, making it essential for visitors to pack an umbrella. Overall, September in Carmarthen offers a transitional taste of autumn, where lush landscapes thrive amid the showers.
As September arrives in Carmarthen, the lingering warmth of summer begins to fade, giving way to brisk autumn breezes. With minimum temperatures averaging around 5°C (42°F) and daytime highs reaching a pleasant 25°C (78°F), this month offers a delightful balance between the heat of summer and the cooler days to come. The average temperature of 15°C (58°F) provides a comfortable backdrop for exploring the area's historic sites and natural beauty. This gradual transition not only marks a shift in weather patterns but also invites the vibrant hues of fall, making September a captivating time to experience all that Carmarthen has to offer.
September in Carmarthen experiences a notable transition as the summer warmth gives way to the impending autumn chill. With 115 mm (4.5 in) of precipitation spread over 16 days, the month shares similar rainfall levels with March and July, indicating a consistent pattern of dampness. This uptick in wet days reflects an overall trend observed from the summer months, which saw slightly higher precipitation, notably 134 mm (5.3 in) in August. The gradual increase in rainfall sets the stage for October, typically the wettest month of the year, hinting that Carmarthen is preparing for more intense downpours as the season changes.
As summer transitions into autumn, September humidity in Carmarthen settles at a moderate 79%, reflecting a noticeable change from the drier conditions of the preceding months. After the peak of July and August, where humidity dipped to around 70% and 73% respectively, September marks a gradual uptick as it paves the way for the wetter months ahead. This shift is significant, as Carmarthen typically experiences higher humidity levels in October and throughout the winter, often exceeding 88%. The month serves as a gentle reminder of the dampness that characterizes the region, while also hinting at the crispness of fall that is just around the corner.
In September, Carmarthen, UK, experiences a UV Index of 6, categorizing it as high exposure and necessitating a burn time of just 25 minutes under direct sunlight. This marks a transition from the peak summer months, where the index reached a very high level of 8 in both June and July, to a more moderate yet still significant level of UV radiation. Following the sun's arc through summer, September's UV levels remain noteworthy, reminding residents and visitors alike to stay vigilant about sun protection. Understand how the UV Index fluctuates through the year and plan your outdoor activities accordingly by referencing the detailed information available at Carmarthen UV Index.
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As the summer days begin to wane, September in Carmarthen shines brightly with an impressive 313 hours of sunshine. This month, while slightly less sun-drenched than the peak of July, showcases a comforting transition into autumn, maintaining a delightful warmth that invites outdoor activities. Following the bustling summer months, which saw highs of 422 hours in July and 379 hours in August, September's sunlight offers a pleasant balance, reminiscent of the vibrant springtime months that brought 341 hours in April and 409 hours in May. This gradual decline in sunshine signals not only the end of the sun-soaked summer but also the gentle, golden hues of the changing season, making Carmarthen a picturesque setting for leisurely strolls and reflection. As October approaches, marked by a noticeable drop to 245 hours, September serves as a reminder of the fleeting joys of summer—an invitation to bask in nature’s glow before the cozy embrace of autumn takes over.
In Carmarthen, United Kingdom, the likelihood of sunny weather in September hovers around 27%, which is a modest improvement compared to the summer months of July and August. After a peak in April at 53%, the chance of sunshine tends to dip gradually through the following months, with September maintaining a steady position within this mid-range. This suggests that while the warmer months typically enjoy higher sunshine probabilities, September offers a balanced blend of summer warmth and early autumn chill, making it a delightful time for outdoor activities before the weather turns. Overall, the trend highlights a gradual transition towards less sunny days, reminding us to embrace those precious rays while they last!
As summer gradually wanes in Carmarthen, United Kingdom, September offers a balanced 12 hours of daylight, a welcoming transition from the longer days of summer. Following the peaks of June and July, where daylight reached a vibrant 16 hours, the gradual decline begins, reflected in the shorter hours of August and September. This month serves as a gentle reminder of autumn's approach, as daylight hours decrease further in October. The pattern of increasing and then decreasing daylight throughout the year not only marks the changing seasons but also invites residents to enjoy the lingering sunshine before the crisp days of fall settle in.
In September, Carmarthen experiences a gentle shift in texture as the summer breeze begins to wane. With an average wind speed of 3.9 m/s (9 mph), the winds are mild, marking a notable decline from the gustier months of earlier summer. This calming wind symbolizes a transition, as the cooler autumn air starts to settle in. June and July showcase the lightest winds of the year, hovering around 3.5 to 3.8 m/s (8 to 9 mph), while October is poised to usher in a return to brisker currents, with speeds rising to 5.9 m/s (13 mph). This rhythmic ebb and flow of wind patterns reflects not just seasonal change but also the evolving character of life in Carmarthen as it prepares for autumn’s embrace.
The weather in Carmarthen 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 Carmarthen and find detailed weather information for every month.
September and January present contrasting weather conditions. In September, temperatures typically range from a mild 5°C (42°F) at night to a comfortable 25°C (78°F) during the day, with an average of 15°C (58°F). This month experiences significant rainfall, totaling 115 mm (4.5 in) over 16 days, while humidity remains relatively high at 79%. In stark contrast, January sees much colder temperatures, with a minimum of -2°C (28°F) and a maximum of only 13°C (56°F), averaging around 6°C (43°F). Although precipitation is slightly lower at 99 mm (3.9 in) over 13 days, the humidity rises to 88%. For more details on January weather, you can visit Carmarthen weather in January.
In comparing the weather between September and February, notable differences emerge in both temperature and precipitation patterns. September tends to be milder, with average temperatures ranging from a minimum of 5°C (42°F) to a maximum of 25°C (78°F), while February is significantly cooler, featuring an average range of -2°C (28°F) to a maximum of 14°C (58°F). Precipitation is quite similar, but February experiences slightly more rainfall with 136 mm (5.3 in) over 17 days, compared to September's 115 mm (4.5 in) over 16 days. Additionally, February tends to be more humid, with humidity levels reaching 88% compared to September's 79%. For a more detailed look at February weather, check out Carmarthen weather in February.
September and March present quite different weather experiences. In September, temperatures range from a mild 5°C (42°F) at their lowest to a warm 25°C (78°F) at their peak, with an average of 15°C (58°F). This month also sees around 115 mm (4.5 in) of precipitation spread over 16 days, leading to a relatively humid environment with 79% humidity. In contrast, March is generally colder, with temperatures dipping as low as -5°C (24°F) and peaking at 16°C (61°F), averaging only 7°C (45°F). Similar to September, March also experiences 115 mm (4.5 in) of precipitation, but it's spread over more days, totaling 18, resulting in a higher humidity level of 86%. For more details, you can check out Carmarthen weather in March.
Comparing the weather in September and April reveals distinct seasonal characteristics. September typically experiences milder temperatures, with an average of 15°C (58°F) and highs reaching up to 25°C (78°F), while April has cooler averages around 9°C (49°F) and maximum temperatures of 19°C (67°F). Additionally, September sees more rainfall, with 115 mm (4.5 in) spread across 16 days, compared to April's 61 mm (2.4 in) over 11 days. Humidity levels are also high in both months, with September at 79% and April slightly higher at 84%. For more details about April weather, you can check Carmarthen weather in April.
When comparing the weather in September and May, September tends to be slightly warmer, with average temperatures around 15°C (58°F) compared to May's 12°C (53°F). September features a maximum temperature of 25°C (78°F), making it the warmer month overall. However, it also sees more rainfall, with 115 mm (4.5 in) over 16 days, while May experiences 90 mm (3.5 in) across just 12 days. Humidity levels are quite similar in both months, hovering around 79% in September and 80% in May, creating a relatively moist atmosphere in both cases. For a closer look at weather specifics in May, you can check Carmarthen weather in May.
In comparing the weather conditions of September and June, both months experience similar average high temperatures of 25°C (78°F), yet September tends to be cooler at the lower end with minimum temperatures reaching 5°C (42°F), compared to June's minimum of 7°C (45°F). Precipitation is slightly higher in September, with 115 mm (4.5 in) over 16 days, while June sees 100 mm (3.9 in) during the same number of days. Humidity levels are comparable, sitting at 79% in September and 80% in June, making both months feel relatively moist. For more specific details about June weather, you can check out Carmarthen weather in June.
When comparing the weather in September and July, September tends to be slightly cooler, with average temperatures ranging from a minimum of 5°C (42°F) to a maximum of 25°C (78°F), while July features a narrower range with minimums around 8°C (48°F) and maximums reaching 26°C (79°F). September also sees more rainfall, averaging 115 mm (4.5 in) over 16 days, compared to July's 91 mm (3.6 in) across 13 days. Additionally, September's humidity is higher at 79%, whereas July maintains a lower humidity level of 70%. For more details about July weather patterns, you can visit Carmarthen weather in July.
In comparing the weather of September and August, we observe notable differences in temperature and precipitation patterns. September features a minimum temperature of 5°C (42°F) and an average of 15°C (58°F), while August stays warmer, with temperatures ranging from a minimum of 9°C (49°F) and an average of 16°C (61°F). Both months see a maximum temperature of 25°C (78°F), but September has higher humidity at 79% compared to August's 73%. Precipitation also varies, with September recording 115 mm (4.5 in) of rain over 16 days, compared to August's 134 mm (5.3 in) over 19 days. For a detailed view of August's weather, you can check Carmarthen weather in August.
In comparing the weather between September and October, it's evident that October experiences cooler temperatures, with a minimum of around 0°C (33°F) and an average of 12°C (54°F), compared to September's more pleasant minimum of 5°C (42°F) and average of 15°C (58°F). Additionally, October sees a slight increase in precipitation, totaling 171 mm (6.7 in) over 18 days, whereas September records 115 mm (4.5 in) over 16 days. Humidity also rises in October to 89%, up from 79% in September, contributing to a decidedly more overcast and damp feel. For more details on October weather, you can visit Carmarthen weather in October.
In September, the weather is generally milder, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 25°C (78°F), and an average temperature of 15°C (58°F). The month experiences about 115 mm (4.5 in) of precipitation over approximately 16 days, accompanied by a humidity level of 79%. In contrast, November sees a significant drop in temperatures, with a minimum of 0°C (33°F) and a maximum of only 15°C (60°F), resulting in an average of 9°C (49°F). Precipitation increases to 151 mm (6.0 in) over around 18 days, along with a higher humidity of 90%. For more detailed insights, visit Carmarthen weather in November.
September and December exhibit noticeable differences in weather patterns. In September, temperatures range from a low of 5°C (42°F) to a high of 25°C (78°F), giving an average of 15°C (58°F). The month experiences approximately 115 mm (4.5 in) of precipitation over 16 days, with humidity levels around 79%. In contrast, December sees colder temperatures with a minimum of 0°C (32°F) and a maximum of 13°C (55°F), averaging only 8°C (46°F). Precipitation increases to 184 mm (7.2 in) across 20 days, accompanied by higher humidity at 89%. For a more detailed look at the weather specifics for December, visit Carmarthen weather in December.
As September unfolds in Carmarthen, the weather shifts noticeably, marking the transition from summer warmth to the crisp embrace of autumn. While temperatures can still reach a pleasant 25°C (78°F), the average hovers around a cooler 15°C (58°F), inviting residents and visitors alike to enjoy the outdoors before winter sets in. With 115 mm of rainfall over 16 days, September proves to be one of the wetter months, often cloaked in a humid atmosphere that lingers at 79%. This change not only influences daily activities but also enriches the vibrant landscapes typical of this time of year. To dive deeper into the specifics of Carmarthen’s weather patterns, explore the Carmarthen Climate.