Last updated: March 17, 2025
September in Wales, United Kingdom, presents a compelling blend of warm and cool weather, with maximum temperatures reaching up to 28°C (83°F) and an average of 14°C (57°F). As summer fades, the days can be crisp, with minimum temperatures dipping to 4°C (39°F). However, this month is not without its showers; expect 63 mm (2.5 in) of rainfall spread across approximately 11 days, creating a backdrop of greenery that Wales is renowned for. The humidity, averaging around 85%, adds a certain richness to the air, contributing to the enchanting charm of the Welsh landscape. Whether you're planning outdoor adventures or cozy indoor retreats, September’s unpredictable weather offers something for everyone.
September in Wales, United Kingdom, presents a delightful transition into autumn, showcasing temperatures that range from a minimum of 4°C (39°F) to a comfortably warm maximum of 28°C (83°F). With an average temperature of 14°C (57°F), this month marks a noticeable shift from the peak summer warmth of August, yet still retains a sense of lingering warmth. As the landscape begins to shift from vibrant greens to the golden hues of fall, the relatively mild September climate invites outdoor exploration, making it an ideal time for hiking and enjoying the scenic beauty Wales has to offer. With temperatures steadily decreasing as October approaches, the early days of September truly embody a perfect blend of late summer warmth and the impending crispness of autumn.
September in Wales brings a moderate amount of rainfall, with an average precipitation of 63 mm (2.5 in) over 11 days. This marks a noticeable decrease compared to the preceding summer months, where August recorded 77 mm and 12 days of rain. As the transition into autumn begins, September's rainfall acts as a gentle precursor to the wetter months ahead, notably October, which sees a surge with 82 mm (3.2 in) of rain across 14 days. This trend showcases Wales' characteristic climate shift, as the warm summer days give way to the famed British drizzle, preparing the landscape for the lush vibrancy of fall.
September in Wales experiences a notable increase in humidity, averaging 85%, which reflects a subtle transition from the drier summer months. Following the warm and relatively low-humidity conditions of July and August, where levels dipped to 76% and 77%, September's humidity marks a significant rise, hinting at the approaching autumn. This shift aligns with the trend observed through the months, where humidity generally climbs back to higher percentages in the fall, peaking again in October at 90%. Thus, September serves as a bridge between the fading summer warmth and the encroaching chill of autumn, showcasing the dynamic climate patterns characteristic of this region of the United Kingdom.
As summer fades into autumn, September in Wales welcomes a UV Index of 5, placing it in the moderate exposure category. This marks a gentle decline from the very high indices recorded in the peak summer months of June and July, where protective measures were crucial as burn times dropped to just 15 minutes. August sees a slight rebound to a high index, but by September, outdoor enthusiasts can enjoy an extended 30 minutes before the sun’s rays become a concern. This trend highlights the shifting seasons and the importance of adjusting sun safety strategies, making it essential to stay informed about the Wales UV Index as you plan your late-summer adventures.
UV Risk Categories
As summer fades into autumn, September in Wales offers a delightful mix of sun and early signs of change. With 277 hours of sunshine, it captures a vibrant blend of warmth as days cool down from the bustling summer months. Following the peak of May and July, which boasted over 380 hours, September maintains a respectable glow, reflecting longer days while heralding the approach of fall. This gentle decline sets a charming backdrop for outdoor activities, enticing visitors to embrace the last warm rays before the crispness of October, known for its 223 hours of sunlight. Thus, September stands out as a beautiful transition month, inviting both locals and tourists to savor the remnants of summer while looking forward to autumn's rich tapestry.
In Wales, the likelihood of sunny weather begins to improve as the year progresses, with September capturing a 29% chance of sunshine. This marks a slight uptick from the summer months, particularly August, which sees a dip to 22%. While September does not boast the highest percentage—April holds that distinction at 46%—it's a transitional month where the lingering warmth of summer begins to wane. With autumn approaching, the sunniest days are still possible, though they become less frequent as the year transitions into the cooler months. Despite this, September still offers a reasonable chance to bask in the gentle sunlight of early autumn.
As summer wanes into autumn, September in Wales offers a gentle transition, showcasing 12 hours of daylight. This marks a gradual decrease from the sun-drenched heights of 16 hours in June and July, where the days felt long and vibrant. Following the lush abundance of late summer, the daylight begins to taper off, hinting at the shorter, cozier days ahead. The month stands as a bridge, beautifully balancing the lingering warmth of summer with the crisp onset of fall. As daylight diminishes, the Welsh landscape transforms, adorned with hues of amber and gold, inviting both reflection and exploration amidst the waning light.
As September arrives in Wales, the winds begin to show a gentle shift, with an average speed of 3.6 m/s (8 mph). This marks a dip compared to the bustling summer months, where wind speeds hovered around 3.9 m/s in both May and August. Interestingly, as the season transitions, there's a noticeable pattern: the briskest winds of the year typically occur in the colder months, with October offering a more lively 5.3 m/s (12 mph). Despite the mellow winds of September, nature's rhythm suggests a gradual buildup in strength as autumn sets in. The overall trend reveals a seasonal ebb and flow, where spring and summer bring softer breezes, while the chill of winter invites a return to higher gusts, creating a dynamic tapestry of weather that characterizes the Welsh landscape.
The weather in Wales 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 Wales and find detailed weather information for every month.
September and January offer contrasting weather experiences. In September, temperatures range from a mild 4°C (39°F) to a warm 28°C (83°F), with an average of 14°C (57°F), while January's temperatures dip considerably, with lows of -4°C (24°F) and highs reaching only 14°C (58°F), averaging at 5°C (40°F). September sees a precipitation of 63 mm (2.5 in) over about 11 days, with humidity levels around 85%, making it feel quite lush. In contrast, January has slightly lower precipitation at 51 mm (2.0 in) over 10 days, accompanied by higher humidity at 90%, contributing to a more wintery feel. For more detailed information, you can check Wales weather in January.
In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 28°C (83°F), with an average of 14°C (57°F). The month experiences around 63 mm (2.5 in) of rainfall across 11 days, while humidity hovers at a relatively high 85%. In contrast, February brings cooler conditions, with minimum temperatures dropping to -5°C (23°F) and a maximum of 17°C (63°F), averaging 5°C (42°F). Precipitation increases slightly to 67 mm (2.6 in) over 12 days, and humidity remains high at 88%. For more detailed information, you can check Wales weather in February.
In comparing the weather between September and March, it’s clear that both months experience cool temperatures, but with notable differences. September offers a more moderate temperature range, with a minimum of 4°C (39°F) and a maximum of 28°C (83°F), resulting in an average of 14°C (57°F). It typically receives 63 mm (2.5 in) of precipitation over about 11 days and maintains a high humidity of 85%.
In contrast, March tends to be colder, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 20°C (68°F), averaging only 7°C (44°F). This month sees slightly higher precipitation, totaling 68 mm (2.7 in) across approximately 13 days, with humidity remaining similar at 86%. For more specific insights into the climatic conditions, visit Wales weather in March.
September and April exhibit distinct weather patterns, highlighting the transition from summer to autumn and the approach of spring, respectively. In September, temperatures range from a cool 4°C (39°F) at night to a warm 28°C (83°F) during the day, with an average of 14°C (57°F). This month typically sees about 63 mm (2.5 in) of precipitation over approximately 11 days, along with high humidity levels of 85%. In contrast, April experiences cooler temperatures, with a minimum of -2°C (28°F) and an average of 8°C (47°F), peaking at 25°C (77°F). Precipitation is lighter at 40 mm (1.6 in) over 7 days, and humidity is slightly lower at 84%. For more detailed insights, you can check Wales weather in April.
In September, temperatures range from a chilly 4°C (39°F) at night to a warm 28°C (83°F) during the day, with an average of 14°C (57°F). This month experiences a higher humidity level at 85% and receives around 63 mm (2.5 in) of rainfall over approximately 11 days. In contrast, May sees slightly cooler temperatures, with a minimum of 0°C (32°F), an average of 12°C (53°F), and a maximum of 25°C (78°F). Precipitation is similar, totaling 64 mm (2.5 in) over 13 days, but with slightly lower humidity at 80%. For more details about the weather in May, you can check Wales weather in May.
When comparing the weather in September and June, we notice some interesting differences. September typically experiences a minimum temperature of 4°C (39°F) and an average of 14°C (57°F), with maximum temperatures reaching up to 28°C (83°F). In contrast, June starts off slightly warmer, with minimums around 6°C (43°F), an average of 15°C (59°F), and a peak of 29°C (84°F). While both months have comparable levels of humidity, September tends to be slightly more humid at 85%, compared to June's 81%. Precipitation is also noteworthy, with September receiving 63 mm (2.5 in) across 11 days and June garnering 80 mm (3.1 in) over 13 days. For more detailed insights, you can visit Wales weather in June.
September tends to be cooler than July, with minimum temperatures dropping to 4°C (39°F) compared to July's minimum of 7°C (45°F). The average temperature in September is 14°C (57°F), significantly lower than July's 17°C (63°F). July also experiences higher maximum temperatures, reaching up to 35°C (95°F), while September peaks at a more moderate 28°C (83°F). In terms of precipitation, September sees about 63 mm (2.5 in) over 11 days, while July is slightly wetter with 80 mm (3.1 in) over 12 days, but with lower humidity at 76% compared to September's 85%. For more detailed information about July's weather, you can visit Wales weather in July.
In comparing the weather of September and August, September tends to be cooler, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 28°C (83°F), averaging 14°C (57°F). In contrast, August is warmer, with a minimum of 8°C (47°F) and reaching up to 32°C (90°F), averaging 16°C (62°F). September also sees slightly less precipitation, at 63 mm (2.5 in) over 11 days, compared to August's 77 mm (3.0 in) over 12 days, although September has a higher humidity level of 85% compared to August's 77%. For more detailed insights about August weather, you can check Wales weather in August.
In September, the weather features a wider temperature range with a minimum of 4°C (39°F), an average of 14°C (57°F), and a maximum of 28°C (83°F). The month sees moderate precipitation, totaling 63 mm (2.5 in) over approximately 11 days, coupled with high humidity at 85%. In contrast, October experiences cooler temperatures, dropping to a minimum of 0°C (32°F) and averaging 11°C (52°F) with a maximum of 23°C (73°F). This month also brings increased rainfall, with 82 mm (3.2 in) spread across about 14 days and slightly higher humidity at 90%. For more specific details, you can check Wales weather in October.
September and November present contrasting weather patterns as autumn progresses. In September, temperatures can range from a mild 4°C (39°F) at night to a warm 28°C (83°F) during the day, with an average of 14°C (57°F). The month sees about 63 mm (2.5 in) of precipitation spread over approximately 11 days, contributing to a humidity level of 85%. In contrast, November brings significantly cooler temperatures, with nighttime lows dropping to -4°C (26°F) and an average of 7°C (45°F). While the maximum temperature reaches only 17°C (63°F), the month experiences a similar level of precipitation at 65 mm (2.5 in) over 12 days, but with a higher humidity of 92%. For more information on November weather, visit Wales weather in November.
The weather in September is generally milder, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 28°C (83°F), and an average of 14°C (57°F). In contrast, December brings much colder conditions, with temperatures dropping to a minimum of -3°C (27°F) and averaging around 5°C (42°F). While September experiences around 63 mm (2.5 in) of rainfall over 11 days, December sees an increase in precipitation to 80 mm (3.1 in) over 15 days, reflecting a wetter climate. Additionally, humidity levels are slightly higher in December at 90%, compared to September's 85%. For more detailed information about December weather, you can check Wales weather in December.
As summer transitions into autumn, September in Wales presents a unique blend of warm and cool days. With temperatures reaching a pleasant maximum of 28°C, the month often feels quite warm, especially in the earlier weeks. However, as the month progresses, the average temperature cools down significantly, gracing the landscape with crisp, refreshing air. This time of year is marked by an increase in precipitation, with 63 mm falling over approximately 11 days, contributing to the lush, green scenery Wales is famous for. The high humidity of 85% can make the air feel heavier, especially after rain showers, setting September apart from the drier, warmer months of summer. For more insights on the temperate climate of this beautiful region, explore Wales Climate.