September Weather in Caerleon, United Kingdom

Last updated: March 17, 2025

In September, Caerleon, United Kingdom, experiences a blend of mild to warm weather, with maximum temperatures reaching 28°C (83°F) and an average of 15°C (59°F). Visitors can expect cooler nights, as temperatures can dip to a minimum of 4°C (40°F). Rainfall is a notable aspect of the month, with a total precipitation amount of 65 mm (2.5 in) spread over 10 days, contributing to the area's lush scenery. With an average humidity of 79%, the air can feel quite moist, enhancing the overall charm of this historic locale.

September Temperature in Caerleon

In Caerleon, United Kingdom, September marks a delightful transition from summer's warmth to the cooler embrace of autumn. With minimum temperatures averaging 4°C (40°F) and peaking at a comfortable 28°C (83°F), the month retains a lingering warmth even as days begin to shorten. The average temperature of 15°C (59°F) offers a pleasant balance, encouraging outdoor activities and leisurely strolls. Compared to the preceding months, September's temperatures gradually decline, hinting at the colder seasons ahead while still offering the joys of late summer. This transitional period invites you to relish the mild days before winter settles in, providing an ideal backdrop for enjoying Caerleon’s scenic landscapes.

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

The chart illustrates September temperature patterns in Caerleon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424445495461646259544745
Data source: Temperature data for Caerleon 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 Caerleon

In September, Caerleon experiences a moderate shift in precipitation patterns, with 65 mm (2.5 in) of rain falling over 10 days. This marks a slight decrease compared to the wetter months of August, which recorded 85 mm in 13 days, indicating a transition as summer gives way to autumn. While the rainfall is significant, it remains comfortably below the levels typically observed in the following months, such as October, which sees a notable spike with 115 mm over 14 days. This trend hints at a gradual increase in precipitation as the year progresses, preparing the landscape for the lushness of autumn and creating a scenic backdrop for the vibrant fall foliage that accompanies the changing season.

September Precipitation Trends in Caerleon

The chart displays monthly precipitation patterns in Caerleon, 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.
JanFebMarAprMayJunJulAugSepOctNovDec64798355727969856511580106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Caerleon

As September rolls into Caerleon, the humidity begins to shift subtly, settling at 79%. This marks a slight increase from the drier months of July and August, which saw humidities of 70% and 73%, respectively. The trend reveals a gradual rise in moisture content as the summer wanes, paving the way for the wetter climate of autumn. Following September, the humidity leaps to 89% in October, foreshadowing the damp and chilly months ahead. This seasonal transition highlights the delicate balance Caerleon maintains between mild summer air and the impending autumnal embrace, making September a unique bridge between the two.

September Average Humidity in Caerleon

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

As September rolls into Caerleon, the UV Index remains notably high at 6, signaling that the sun's intensity is still significant as summer wanes. This marks a slight decline from the peak of 8 observed in July and June, yet it still necessitates vigilance when enjoying outdoor activities, with a burn time of just 25 minutes for unprotected skin. This transitional month showcases a trend where UV levels begin to moderate, shifting from the very high exposure of summer, but still warranting attention as the days shorten. Don't forget to check your skin protection strategies to safely bask in the early autumn sun. For more details, visit Caerleon UV Index.

Maximum UV Index Levels in Caerleon for September

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

As summer gracefully fades into autumn, September in Caerleon offers a charming blend of warmth and serenity, with 279 hours of sunshine illuminating the landscape. This month marks a gentle decline from the sun-drenched peak of July, which boasts an impressive 399 hours, while still retaining a generous amount of daylight compared to the shorter days that follow in October. The transition is a vivid reminder of the region's vibrant seasons; September's sunshine not only nourishes the earth but also invites locals and visitors alike to relish the lingering warmth before winter's chill sets in. With a rich tapestry of golden hues starting to weave through the leaves, September provides a perfect backdrop for exploring Caerleon's historic charm amidst its sun-soaked days.

Monthly Sunshine Duration in Caerleon: September Highlighted

The September sunshine duration represents the total number of hours Caerleon 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.
JanFebMarAprMayJunJulAugSepOctNovDec81h134h192h303h379h355h399h345h279h224h121h100h
Data source: Caerleon September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Caerleon During September

As September arrives in Caerleon, the chance of sunny weather hovers around 28%, mirroring the averages seen in the summer months. This slight dip from the sunnier heights of April (53%) and the fluctuation in the summer months reveals a transition towards the cooler autumn days. While the likelihood of sunshine in September is higher than in the deep winter months, it also signals the end of the peak summer radiance. The pattern indicates that although the days still hold warmth, the sun begins to shy away, making way for the crisper air of October. Embrace the late summer vibes, but keep an umbrella handy—after all, the unpredictable British weather is always on the horizon!

Percentage of Sunny Days in September in Caerleon

The chart illustrates the percentage of sunny days in Caerleon 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 Caerleon experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%23%28%53%34%27%40%29%28%22%31%20%
Data source: Caerleon September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Caerleon in September

As the vibrant summer months in Caerleon, United Kingdom, gradually wane, September ushers in a notable transition in daylight hours. With an average of 12 hours of daylight, the month reflects a delicate balance between the brighter, sun-drenched days of July and August and the impending shorter days of autumn. This shift showcases a gradual decline in daylight, beginning from June’s peak of 16 hours. As nature prepares for the cooler months ahead, the sunlight begins to soften, providing a gentle reminder of the cozy evenings to come, while still offering ample opportunities to enjoy the lingering warmth of early fall.

Average Daylight Hours in Caerleon for September

The chart illustrates the variation in daylight duration in Caerleon throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 23m9h 58m11h 55m13h 54m15h 38m16h 33m16h 4m14h 30m12h 35m10h 36m8h 50m7h 53m
Data source: Caerleon daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Caerleon

As September arrives in Caerleon, a distinct calm settles over the landscape, with an average wind speed of just 3.5 m/s (8 mph), mirroring the subtle transition from summer's warmth to autumn's embrace. This gentler breeze signifies a notable dip from the summer months, where winds peaked at 4.0 m/s (9 mph) in August. Interestingly, September's winds are on par with those of June and July, indicating a trend of decreasing wind speeds as the year progresses toward the cooler months. The mild gusts create a serene atmosphere perfect for enjoying the beauty of the changing foliage, while the gradual shift sets the stage for the brisk breezes of autumn that follow in October.

Average September Wind Speed in Caerleon

The chart displays monthly wind speed patterns in Caerleon, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.85.54.73.64.53.53.34.03.5 m/s4.64.04.9
Data source: Caerleon September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Caerleon Compares to Other Months

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

September and January present stark contrasts in weather conditions. In September, temperatures range from a mild 4°C (40°F) at night to a warm average of 15°C (59°F) and peak at a comfortable 28°C (83°F) during the day, with a rainfall total of 65 mm (2.5 in) over approximately 10 days. The humidity hovers around 79%, making it a relatively pleasant month. In contrast, January experiences colder temperatures, with a minimum of -3°C (27°F) and a maximum of just 14°C (57°F), resulting in an average of 6°C (42°F). Precipitation is similar at 64 mm (2.5 in), but falls over 11 days, while humidity rises to 88%, creating a much chillier atmosphere. For more details, you can check Caerleon weather in January.

September and February present notably different weather patterns. In September, temperatures range from a crisp 4°C (40°F) at night to a pleasant 28°C (83°F) during the day, with an average of 15°C (59°F). The month sees around 65 mm (2.5 in) of precipitation over approximately 10 days, accompanied by a moderate humidity of 79%. In contrast, February experiences cooler temperatures, with a minimum of -4°C (25°F) and a maximum of 16°C (61°F), averaging just 6°C (44°F). This month tends to be wetter, with 79 mm (3.1 in) of rainfall spread over about 13 days and higher humidity at 88%. To see more about February weather, check out Caerleon weather in February.

In comparing the weather between September and March, we see distinct contrasts in temperature and precipitation. September boasts a more moderate temperature range, with minimums of 4°C and maximums reaching 28°C, creating an average of 15°C. In contrast, March starts off much cooler, featuring minimum temperatures around -5°C and an average of only 7°C, with highs of 20°C.

Precipitation patterns also differ, as September experiences about 65 mm over roughly 10 days, while March has a slightly higher total of 83 mm spread over 14 days, leading to a more humid atmosphere with 86% compared to September's 79%. This shift in weather conditions highlights the transition from late summer warmth to early spring chill. For a more detailed glimpse into the weather specifics of March, check out Caerleon weather in March.

When comparing the weather in September and April, we see distinct differences between the two months. September enjoys a warmer average temperature of 15°C (59°F) with maximum highs reaching up to 28°C (83°F), making it a pleasant time of year. In contrast, April is cooler overall, with an average temperature of 10°C (49°F) and maximums peaking at 22°C (71°F).

While precipitation is slightly higher in September at 65 mm (2.5 in) over 10 days compared to April’s 55 mm (2.2 in) over 9 days, both months experience relatively high humidity, with September at 79% and April at 84%. For a more detailed look at April's weather, you can check out Caerleon weather in April.

In September, the weather tends to be warmer, with average temperatures reaching up to 15°C (59°F) and maximums peaking at 28°C (83°F), compared to May, where the average is slightly lower at 12°C (55°F) and maximums reach 25°C (78°F). However, September also sees more variability in temperature, with a minimum of 4°C (40°F) compared to May's 2°C (36°F). Precipitation levels are similar, with September receiving a total of 65 mm (2.5 in) across about 10 days, while May has a bit more rainfall at 71 mm (2.8 in) over approximately 12 days. Humidity remains high in both months, with September at 79% and May slightly higher at 80%. For a closer look at the conditions in May, check out Caerleon weather in May.

September and June both exhibit mild temperatures, but September tends to have a wider range, with minimums dipping to 4°C (40°F) and maximums reaching up to 28°C (83°F). In contrast, June starts at a slightly warmer minimum of 8°C (46°F) and peaks at 29°C (85°F). Precipitation is a bit heavier in June, measuring 79 mm (3.1 in) over 12 days, while September sees 65 mm (2.5 in) over 10 days. Humidity levels are similar, with September at 79% and June slightly higher at 80%. For a more detailed look at June weather, visit Caerleon weather in June.

In comparing the weather of September and July, September generally presents cooler temperatures with a minimum of 4°C (40°F) and an average of 15°C (59°F), while July showcases warmer conditions with a minimum of 9°C (49°F) and an average of 18°C (64°F). Both months see similar maximum temperatures, with September peaking at 28°C (83°F) and July slightly higher at 29°C (85°F). Precipitation levels are fairly close, with September receiving 65 mm (2.5 in) over 10 days compared to July's 69 mm (2.7 in) over 11 days. Interestingly, September experiences higher humidity at 79%, whereas July maintains a lower humidity level of 70%. For more detailed information about July weather, you can check Caerleon weather in July.

September weather is notably cooler than August, with average temperatures dropping from 17°C (63°F) in August to 15°C (59°F) in September. The minimum temperature in September is 4°C (40°F), whereas August holds a higher minimum of 9°C (48°F). In terms of precipitation, September sees a decrease to 65 mm (2.5 in) over 10 days, compared to August's 85 mm (3.3 in) over 13 days, though humidity remains higher in September at 79%, compared to 73% in August. For more detailed information, you can learn about the conditions in August by visiting Caerleon weather in August.

In comparing the weather in September and October, it is evident that temperatures drop significantly as the seasons transition. In September, the minimum temperature hovers around 4°C (40°F) and the average is a mild 15°C (59°F), with occasional highs reaching up to 28°C (83°F). In contrast, October sees cooler minimums at 1°C (33°F) and an average temperature of 12°C (54°F), peaking at 22°C (72°F). Furthermore, October experiences increased precipitation, totaling 115 mm (4.5 in) over 14 days, compared to September's 65 mm (2.5 in) throughout 10 days. The humidity also rises, reaching 89% in October, compared to 79% in September. For more detailed information about October weather, you can check Caerleon weather in October.

September and November present striking differences in weather characteristics. In September, temperatures range from a minimum of 4°C (40°F) to a warm maximum of 28°C (83°F), with an average of 15°C (59°F), making it the tail end of summer. The month experiences about 65 mm (2.5 in) of precipitation over around 10 days, accompanied by a humidity level of 79%. In contrast, November sees a significant drop in temperatures, with minima reaching -1°C (30°F) and maxima averaging only 16°C (62°F). The average temperature falls to 9°C (48°F), and precipitation increases to 80 mm (3.1 in) spread across 14 rainy days, paired with higher humidity at 90%. For a detailed outlook, you can check Caerleon weather in November.

September and December showcase stark contrasts in weather conditions. September typically enjoys milder temperatures, with a minimum of 4°C (40°F) and a pleasant average of 15°C (59°F), peaking at 28°C (83°F) during warmer days. In contrast, December brings chillier temperatures, with lows dropping to -5°C (24°F), an average of just 7°C (45°F), and a maximum of 14°C (57°F). Additionally, September experiences about 65 mm (2.5 in) of precipitation over 10 days, while December is notably wetter, with 106 mm (4.2 in) spread across 16 days. The humidity also increases, from 79% in September to 89% in December, contributing to a much colder feel. For more insights on the December climate, you can visit Caerleon weather in December.

Compare Caerleon's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Caerleon

As September unfolds in Caerleon, the weather presents a delightful transition from summer's warmth to the crispness of autumn. With maximum temperatures reaching a comfortable 28°C, the month still harbors some lingering heat; however, the average temperature settles at a cooler 15°C, reflecting the gradual shift in season. Rainfall becomes more frequent, with about 10 days experiencing precipitation, contributing to the overall humidity of 79%. This contrasts with the warmer, drier months of summer, making September a time of vibrant change and natural beauty. For a deeper understanding of how the weather evolves throughout the year, explore the Caerleon Climate.