September Weather in Clerkenwell, United Kingdom

Last updated: March 17, 2025

In Clerkenwell, United Kingdom, September brings a blend of mild temperatures and occasional rainfall, making it a transitional month for the region. With a maximum temperature of 28°C (83°F) and an average of 15°C (60°F), the days can be pleasantly warm, while cooler nights dip to a minimum of 4°C (40°F). This month experiences about 9 days of precipitation, totaling 45 mm (1.8 in), with humidity levels lingering around 80%, creating a damp yet refreshing atmosphere. Whether you're exploring the vibrant streets or winding through historic alleys, September's weather presents a unique charm to experience.

September Temperature in Clerkenwell

In September, temperatures in Clerkenwell begin to reflect the transition into autumn, with a noticeable drop from the summer heat. The month greets with a minimum of 4°C (40°F), offering a refreshing start, while the average temperature climbs to a comfortable 15°C (60°F). As the days progress, highs reach up to 28°C (83°F), providing a final glimpse of summer warmth. This pattern indicates a gradual shift, as the lingering warm days become fewer, paving the way for cooler autumnal weather. Overall, September strikes a perfect balance with mild conditions that invite both outdoor exploration and cozy indoor activities.

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

The chart illustrates September temperature patterns in Clerkenwell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414346495562656459544643
Data source: Temperature data for Clerkenwell 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 Clerkenwell

September in Clerkenwell ushers in the onset of autumn with 45 mm (1.8 in) of precipitation spread over 9 days, marking a transition in weather patterns. This month's rainfall is notably lighter compared to the wettest summer months, June and August, which recorded 77 mm (3.0 in) and 72 mm (2.8 in) respectively. As the region begins to cool, the number of rainy days remains consistent, falling in line with late summer trends but hinting at the wetter conditions that October typically brings. With 81 mm (3.2 in) of expected rainfall, it’s clear that September serves as a gentle precursor to the more significant downpours of the coming months, reminding residents to prepare for the changes ahead.

September Precipitation Trends in Clerkenwell

The chart displays monthly precipitation patterns in Clerkenwell, 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.
JanFebMarAprMayJunJulAugSepOctNovDec545253326377647245814884
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Clerkenwell

In September, humidity in Clerkenwell tends to settle at around 80%, marking a slight increase from the drier summer months of July and August, which registered at 76% and 73% respectively. This rise encompasses a transition towards the wetter autumn season, as the region braces for higher moisture levels in the coming months. As we look back through the year, it’s evident that humidity levels start high in winter, peaking at 91% in January, and gradually decrease to a low in the summer before beginning to climb again in the fall. This cyclical pattern underscores the influence of seasonal changes on humidity, shaping the distinctive character of Clerkenwell's climate.

September Average Humidity in Clerkenwell

This chart illustrates the average monthly humidity levels in Clerkenwell, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%82%81%76%73%80%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Clerkenwell

In September, Clerkenwell sees a UV Index of 6, placing it in the high exposure category with a burn time of just 25 minutes. This marks a slight decrease from the peak summer months, where the index reached 8 in both June and July, yet it remains significantly higher than the winter months of January and February. As summer transitions to autumn, the UV levels begin to moderate, indicating that while some sun protection is still essential, the intensity of UV radiation is gradually subsiding. For those seeking to understand and manage their sun exposure this month, more insights can be found at Clerkenwell UV Index.

Maximum UV Index Levels in Clerkenwell for September

The chart shows the monthly maximum UV Index (UVI) for Clerkenwell 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578876421
Data source: Clerkenwell 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 Clerkenwell

As summer gently gives way to autumn, September in Clerkenwell continues to bask in a generous 300 hours of sunshine, making it one of the sunniest months of the year. Following the peak of July's 405 hours, there is a noticeable seasonal shift as sunlight begins to wane, yet September retains a significant amount of brightness, outshining both the preceding months of June and August. This gradual decline signals a transition, as the vibrant energy of summer prepares to retreat into the cooler embrace of October. Despite the reduction, the warmth of September’s sunlight provides a delightful backdrop for outdoor activities, reminding us to relish the lingering rays before the darker months set in.

Monthly Sunshine Duration in Clerkenwell: September Highlighted

The September sunshine duration represents the total number of hours Clerkenwell 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.
JanFebMarAprMayJunJulAugSepOctNovDec95h146h211h319h398h393h405h372h300h240h142h106h
Data source: Clerkenwell September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Clerkenwell During September

September in Clerkenwell, United Kingdom, offers a 29% chance of sunny weather, a figure that reflects the lingering warmth of summer but doesn't quite match the peak sunny spells seen in April, which boasts a 49% likelihood. As the seasons transition, the sunshine probability dips lower than the spring months, aligning more closely with late summer and autumn. While the chances are slightly higher than in the colder months of January and December, they are steadier than in May and August. This trend suggests that while September won't guarantee sun-soaked days, it still holds potential for pleasant weather amid the early autumn chill.

Percentage of Sunny Days in September in Clerkenwell

The chart illustrates the percentage of sunny days in Clerkenwell 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 Clerkenwell experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%25%29%49%34%29%39%26%29%25%32%17%
Data source: Clerkenwell September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Clerkenwell in September

As summer wanes, September in Clerkenwell, United Kingdom brings a noticeable transition, with daylight lasting approximately 12 hours each day. This marks a gentle decline from the long, sunlit days of July and June, each boasting a maximum of 16 hours. The gradual decrease in daylight reflects the shifting seasons, as the warmth of summer gives way to the crispness of autumn. Following the vibrant August, which retains 14 hours of sunlight, September serves as a bridge to shorter days, setting the stage for the early twilight of October with its 10 hours of daylight, while reminding us of the cyclic nature of time and light throughout the year.

Average Daylight Hours in Clerkenwell for September

The chart illustrates the variation in daylight duration in Clerkenwell 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 49m7h 53m
Data source: Clerkenwell daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Clerkenwell

As September arrives in Clerkenwell, the gentle breeze signals a shift in the seasons, with an average wind speed of 3.2 m/s (7 mph), among the mildest of the year. This slight decrease from the summer's end reflects a transition towards the crisper, more invigorating autumn winds. While the earlier months display more robust gusts, peaking in February and October at 4.6 m/s (10 mph), September’s calmness invites a serene stroll through the streets, making it the perfect time to enjoy the lingering warmth. As the days grow shorter and the air turns cooler, the subtle winds remind us that change is in the air, heralding the vibrant colors of fall soon to come.

Average September Wind Speed in Clerkenwell

The chart displays monthly wind speed patterns in Clerkenwell, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.14.64.43.44.23.03.33.83.2 m/s4.33.74.3
Data source: Clerkenwell September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Clerkenwell Compares to Other Months

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

September and January present markedly different weather patterns. In September, temperatures generally range from a refreshing 4°C (40°F) at night to a warm 28°C (83°F) during the day, with an average temperature of 15°C (60°F). The month sees approximately 45 mm (1.8 in) of precipitation over nine days, coupled with a humidity level around 80%. In contrast, January experiences much colder conditions, with temperatures dipping as low as -5°C (24°F), averaging just 5°C (41°F), and reaching a maximum of 14°C (58°F). Precipitation increases slightly to 54 mm (2.1 in) over the same number of rainy days, while humidity rises to 91%. For a detailed look at January's weather, you can check out Clerkenwell weather in January.

September and February showcase stark contrasts in weather. In September, temperatures range from a mild 4°C (40°F) at night to a comfortable 28°C (83°F) during the day, with an average of 15°C (60°F). This month typically sees around 45 mm (1.8 in) of precipitation over nine days, accompanied by humidity levels around 80%. In contrast, February presents a much chillier climate, with minimum temperatures dropping to -7°C (21°F) and a daytime maximum of only 18°C (65°F). The average temperature in February is a brisk 6°C (43°F), with slightly higher precipitation at 52 mm (2.0 in) spread over 11 days and an increased humidity of 89%. For more details, you can check Clerkenwell weather in February.

September and March showcase notable contrasts in weather patterns. September enjoys milder temperatures, with a minimum of 4°C (40°F) and an average of 15°C (60°F), reaching a maximum of 28°C (83°F). In contrast, March experiences chillier conditions, starting at a minimum of -5°C (23°F) and averaging 8°C (46°F), climbing to a maximum of 22°C (72°F). Precipitation is slightly higher in March, totaling 52 mm (2.1 in) over 13 days, compared to September's 45 mm (1.8 in) over 9 days. Additionally, March has a higher humidity level of 86% versus September's 80%. For more detailed information on March weather in Clerkenwell, you can visit Clerkenwell weather in March.

When comparing the weather in September and April, notable differences emerge. September boasts a milder average temperature of 15°C (60°F), with maximums reaching up to 28°C (83°F), whereas April has a cooler average of 10°C (49°F) and occasional highs of 26°C (80°F). Precipitation levels are slightly higher in September at 45 mm (1.8 in) over 9 days, compared to April's 32 mm (1.3 in) across 7 days. Additionally, while the humidity in April is slightly higher at 85%, September’s humidity of 80% still contributes to a slightly warmer feel overall. For more detailed insights, you can check out the Clerkenwell weather in April.

In comparing the weather between September and May, September tends to be warmer, with average temperatures reaching 15°C (60°F) compared to May's average of 13°C (55°F). The maximum temperatures in September can rise up to 28°C (83°F), while May's peak is cooler at 25°C (78°F). However, May has slightly lower minimum temperatures, with a low of 1°C (34°F) compared to September's 4°C (40°F). Precipitation levels in May are higher, averaging 63 mm (2.5 in) over 10 days, compared to September's 45 mm (1.8 in) over 9 days. Humidity remains fairly consistent in both months, at around 80% in September and slightly higher at 82% in May. For more detailed insights, you can check Clerkenwell weather in May.

In comparing the weather between September and June, it's clear that September experiences milder temperatures, with a minimum of 4°C (40°F) and a maximum of 28°C (83°F), while June tends to be warmer overall, starting at 7°C (45°F) and reaching up to 32°C (89°F). The average temperature in September is 15°C (60°F), slightly lower than June's average of 17°C (62°F). Additionally, precipitation levels are higher in June, with 77 mm (3.0 in) over 8 days, compared to September’s 45 mm (1.8 in) over 9 days. Both months have similar humidity levels, hovering around 80% and 81%, respectively. For more detailed insights, you can check out Clerkenwell weather in June.

When comparing the weather in September and July, it's clear that July tends to be warmer and more humid. In July, temperatures range from a minimum of 9°C (49°F) to a maximum of 36°C (97°F), with an average of 18°C (65°F). In contrast, September has a broader temperature range, with minimums of 4°C (40°F) and maximums of 28°C (83°F), leading to a milder average of 15°C (60°F). Although September experiences slightly less precipitation at 45 mm (1.8 in) over 9 days compared to July's 64 mm (2.5 in) over 11 days, it is notable that September's humidity is slightly higher at 80%. For more details, you can check Clerkenwell weather in July.

When comparing the weather in September to that of August, we observe a noticeable shift in temperatures and precipitation patterns. September features a minimum temperature of 4°C (40°F) and an average of 15°C (60°F), with a maximum reaching 28°C (83°F), indicating cooler evenings and more moderate days. In contrast, August typically has a higher minimum of 8°C (47°F) and an average of 18°C (64°F), peaking at a maximum of 34°C (94°F), which means warmer days overall. Additionally, September experiences 45 mm (1.8 in) of precipitation over 9 days, compared to August's 72 mm (2.8 in) across 12 days, signaling a drier period. The humidity is slightly higher in September at 80%, compared to August's 73%. For more details regarding August's conditions, you can visit Clerkenwell weather in August.

In September, temperatures ranged from a minimum of 4°C (40°F) to a maximum of 28°C (83°F), with an average temperature of 15°C (60°F). The month saw around 45 mm (1.8 in) of precipitation over 9 days, and humidity levels hovered at 80%. In contrast, October brings cooler conditions, with temperatures dropping to a minimum of 1°C (34°F) and an average of 12°C (54°F), peaking at 23°C (73°F). Additionally, October experiences increased rainfall, accumulating 81 mm (3.2 in) over 12 days, while humidity rises to 89%. For a more detailed look at local conditions, check out Clerkenwell weather in October.

September and November weather showcase a significant shift in temperature and conditions. In September, temperatures range from a mild 4°C (40°F) at night to a warm average of 15°C (60°F) and can peak at 28°C (83°F). The humidity is relatively high at 80%, and rain falls on about 9 days, totaling 45 mm (1.8 in). In contrast, November sees a notable drop, with minimum temperatures reaching -2°C (28°F) and an average of only 8°C (47°F), maxing out at 17°C (62°F). This month brings slightly more rainfall, with 48 mm (1.9 in) over 10 days, and humidity rises to 92%. For those interested in specific weather patterns, more details can be found at Clerkenwell weather in November.

September and December present a striking contrast in weather conditions. In September, temperatures range from a mild 4°C (40°F) at night to a warm 28°C (83°F) during the day, with an average temperature of 15°C (60°F). The month sees approximately 45 mm (1.8 in) of precipitation spread over 9 days, coupled with a humidity level of 80%. In contrast, December brings colder temperatures, with nighttime lows dropping to -4°C (25°F) and daytime highs peaking at 14°C (58°F), averaging around 6°C (44°F). It also tends to be wetter, with 84 mm (3.3 in) of precipitation over 14 days and a higher humidity of 92%. For more detailed information, you can check Clerkenwell weather in December.

Compare Clerkenwell's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Clerkenwell

As September unfolds in Clerkenwell, the transition from summer to autumn becomes palpable, marked by a comfortable warmth that gently gives way to cooler nights. While the days can still reach maximums around 28°C, the evenings dip down significantly, inviting a coat for those brisk outings. With an average temperature of 15°C, the month brings a mix of sun and the occasional rain, with 45 mm of precipitation spread over about 9 days, contributing to the lush greenery of the area. The high humidity of 80% adds a touch of mugginess, creating a unique atmosphere that distinguishes September from the drier and hotter summer months. For a deeper understanding of what to expect in terms of climate year-round, check out Clerkenwell Climate.