September Weather in Gloucester, United Kingdom

Last updated: March 17, 2025

In September, Gloucester experiences a compelling blend of weather patterns, where temperatures reach a maximum of 29°C (84°F), while the average hovers around a comfortable 14°C (58°F), dipping to a cool minimum of 3°C (37°F) at night. This month sees an average precipitation of 53 mm (2.1 in) spread over 8 days, creating a lush environment, enhanced by a relatively high humidity level of 82%. These conditions offer a delightful transition from summer warmth to the onset of autumn, making Gloucester an intriguing destination as the seasons shift.

September Temperature in Gloucester

In September, Gloucester experiences a delightful transition from summer's warmth to the crispness of autumn. With temperatures ranging from a mild 3°C (37°F) at night to a pleasant 29°C (84°F) during the day, the month offers a comfortable average of 14°C (58°F). This climate allows for beautiful, sunny days that are perfect for outdoor activities, while the notably cooler evenings create an inviting atmosphere for cozy gatherings. As summer’s peak fades, the decreasing temperatures herald the arrival of fall, making September a unique blend of warmth and the enchanting allure of changing seasons.

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

The chart illustrates September temperature patterns in Gloucester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414345485460646258524643
Data source: Temperature data for Gloucester generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Gloucester

In September, Gloucester experiences a notable shift in its weather patterns, with precipitation totaling 53 mm (2.1 in) over the month. This rainfall occurs on just 8 days, marking a decline from the wetter summer months when rain typically fell more frequently. Following the soaring totals of July and August, this return to a drier phase is refreshing. Interestingly, September mirrors the precipitation levels of January, indicating a degree of consistency in the transitional seasons. As autumn approaches, the heavier rains of October loom, but for now, the milder September weather provides a pleasant reprieve, showcasing the region's characteristic variability.

September Precipitation Trends in Gloucester

The chart displays monthly precipitation patterns in Gloucester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec536068487473637353966686
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Gloucester

September in Gloucester, United Kingdom, marks a slight resurgence in humidity, registering at 82%. This increase is noteworthy as it transitions from the warmer summer months, where humidity levels dipped to a comfortable 71% in July and 76% in August. As autumn approaches, the air begins to feel more saturated, setting the stage for the wetter, chillier months ahead. In contrast to the crispness of early autumn, January and February exhibit their own extremes, with humidity peaking at 91% and 89%, respectively. Overall, Gloucester experiences a gradual ebb and flow of humidity throughout the year, with September serving as a pivotal moment in the seasonal cycle as it bridges summer's warmth and the coming cooler, more humid months.

September Average Humidity in Gloucester

This chart illustrates the average monthly humidity levels in Gloucester, 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%79%81%71%76%82%91%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Gloucester

As autumn approaches in Gloucester, the September UV Index settles at a moderate level of 6, indicating high exposure potential. This marks a slight decrease from the peak summer months, where UV levels reached 8, but still requires careful sun protection during the 25 minutes it takes for unprotected skin to burn. Notably, September reflects a transition in the season, where sun worshippers can enjoy the remnants of summer while being mindful of UV intensity. As we move into October, the index drops to a 4, highlighting a more moderate risk. To better understand how to protect yourself year-round, check out the Gloucester UV Index for all the details you need.

Maximum UV Index Levels in Gloucester for September

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

September in Gloucester brings a delightful transition as summer begins to fade, offering 284 hours of sunshine that contribute to its charming early autumn scenery. This month showcases a slight decline from the sun-drenched 395 hours in July, yet still holds onto ample warmth and brightness, outshining the cloudier days of October with its 231 hours. As the year progresses, the amount of sunshine notably decreases, with November and December seeing substantially less light—131 and 108 hours, respectively. The trend illustrates a gradual waning of summer's radiance, while September stands out as a beautiful bridge between the vibrant days of summer and the cooler embrace of autumn.

Monthly Sunshine Duration in Gloucester: September Highlighted

The September sunshine duration represents the total number of hours Gloucester 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.
JanFebMarAprMayJunJulAugSepOctNovDec89h142h194h308h381h364h395h347h284h231h131h108h
Data source: Gloucester September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Gloucester During September

In Gloucester, the likelihood of sunny weather in September stands at a modest 26%, closely mirroring the patterns observed during the summer months. While not the sunniest time of the year—April boasts a significantly higher chance at 51%—September's weather hints at the tail end of summer, echoing the 25% chance seen in August. This trend suggests that while sunny days may be fleeting, the lingering warmth of early autumn offers a gentle transition from the vibrant summer. As temperatures begin to cool, those in Gloucester can still anticipate a sprinkling of bright days before autumn fully sets in, making September a pleasantly unpredictable month.

Percentage of Sunny Days in September in Gloucester

The chart illustrates the percentage of sunny days in Gloucester 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 Gloucester experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%23%27%51%32%26%37%25%26%24%31%18%
Data source: Gloucester September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Gloucester in September

As summer fades in September, Gloucester enjoys a gentle decline in daylight, with 12 hours of sun illuminating the city. This month marks a transition from the long, sunny days of July and August, where daylight peaked at 16 and 14 hours, respectively. The gradual shortening of days leads into autumn, a natural rhythm that reflects the shifting seasons. Just a month prior, the community basked in nearly double the daylight experienced in the depths of winter, where January sees a mere 8 hours. September offers a perfect balance, allowing residents to relish the lingering warmth while preparing for the cozy months that follow.

Average Daylight Hours in Gloucester for September

The chart illustrates the variation in daylight duration in Gloucester throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 22m9h 57m11h 55m13h 55m15h 40m16h 34m16h 5m14h 31m12h 35m10h 36m8h 49m7h 51m
Data source: Gloucester daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Gloucester

As summer fades into fall, September in Gloucester experiences a gentle breeze, with an average wind speed of 3.3 m/s (7 mph) that mirrors the calming atmosphere of early autumn. This marks a noticeable dip from the slightly more vigorous winds of the preceding months, such as August’s mild 3.7 m/s. The trend throughout the year shows that Gloucester typically enjoys its windiest months in the late fall and winter, notably with a sharper increase in October, where winds reach up to 4.5 m/s (10 mph). The transition into September encapsulates a serene shift as the landscape begins to embrace the changing season, offering a tranquil yet refreshing experience for locals and visitors alike.

Average September Wind Speed in Gloucester

The chart displays monthly wind speed patterns in Gloucester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.25.24.43.34.13.33.03.73.3 m/s4.53.84.5
Data source: Gloucester September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Gloucester Compares to Other Months

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

September and January present stark contrasts in weather. September boasts a minimum temperature of 3°C (37°F) and an average of 14°C (58°F), reaching a maximum of 29°C (84°F), providing generally warmer conditions. In contrast, January sees a drop in temperatures, with a minimum of -4°C (25°F), an average of 5°C (41°F), and a maximum of only 14°C (57°F). While both months receive similar amounts of precipitation, with 53 mm (2.1 in) recorded, September experiences about 8 rainy days compared to January's 10 days. Additionally, humidity is slightly higher in January at 91%, compared to September's 82%. For more detailed information on January weather, you can check Gloucester weather in January.

September and February present distinctly different weather patterns. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 29°C (84°F), with an average of 14°C (58°F). The month sees a total precipitation of 53 mm (2.1 in) over about 8 days and maintains a humidity level of 82%. In contrast, February experiences much colder temperatures, with a minimum of -6°C (22°F) and a maximum of 18°C (64°F), averaging around 6°C (43°F). This month has a higher total precipitation of 60 mm (2.3 in) spread over 13 days and a humidity level of 89%. For more details on February weather, you can check this link: Gloucester weather in February.

When comparing the weather in September and March, significant differences emerge. September typically enjoys milder temperatures with a minimum of 3°C (37°F) and an average of 14°C (58°F), peaking at a warm 29°C (84°F). In contrast, March is notably colder, with temperatures dipping to a minimum of -6°C (22°F) and an average of 7°C (45°F), reaching a maximum of 21°C (70°F). Additionally, September sees less precipitation, with 53 mm (2.1 in) over about 8 days, whereas March experiences increased rainfall, totaling 68 mm (2.7 in) over 14 days. Humidity levels are slightly higher in March at 86%, compared to 82% in September. For more detailed weather insights, you can check Gloucester weather in March.

When comparing the weather in September and April, September generally experiences milder temperatures, with an average of 14°C (58°F) and a maximum of 29°C (84°F), while April has a cooler average of 9°C (49°F) and a maximum of 24°C (75°F). However, April can dip to a chilling minimum of -3°C (26°F) compared to September's minimum of 3°C (37°F). In terms of precipitation, September sees about 53 mm (2.1 in) over 8 days, slightly higher than April's 48 mm (1.9 in) over 9 days. Both months exhibit high humidity levels, with September at 82% and April slightly higher at 85%. For more specific details on April weather conditions, refer to Gloucester weather in April.

When comparing the weather in September and May, September tends to be warmer, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 29°C (84°F), while May has a cooler average ranging from 0°C (32°F) to 26°C (79°F). September experiences slightly less precipitation, averaging 53 mm (2.1 inches) over about 8 days, compared to May's 74 mm (2.9 inches) spread over 12 days. Additionally, humidity levels remain relatively high in both months, with September at 82% and May at 79%. For a more detailed look at weather specifics, check out Gloucester weather in May.

When comparing September and June weather, it is clear that both months enjoy mild temperatures, but with some notable differences. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 29°C (84°F), averaging around 14°C (58°F). The month experiences approximately 53 mm (2.1 in) of precipitation over about 8 days, with a moderate humidity level of 82%. In contrast, June starts off warmer with minimum temperatures of 6°C (43°F) and maximums reaching 30°C (87°F), averaging around 16°C (61°F). June also tends to be slightly wetter, receiving around 73 mm (2.9 in) of rainfall over approximately 11 days, while maintaining a slightly lower humidity level of 80%. For more detailed information on June weather, you can check out Gloucester weather in June.

When comparing the weather between September and July, September generally experiences cooler temperatures with a minimum of 3°C (37°F) and an average of 14°C (58°F), while July boasts warmer temperatures, ranging from a minimum of 7°C (45°F) to an average of 18°C (64°F). July also tends to be sunnier, reaching a maximum of 31°C (88°F), making it warmer than September's peak of 29°C (84°F). In terms of precipitation, September sees slightly less rain, with 53 mm (2.1 in) over 8 days compared to July's 63 mm (2.5 in) across 11 days. Additionally, September is more humid with 82% humidity, whereas July has a more comfortable 71% humidity. For a detailed look at July's weather, you can visit Gloucester weather in July.

In comparing the weather patterns of September and August, September offers a notable decrease in minimum temperatures, dipping to 3°C (37°F) compared to August's 7°C (45°F). The average temperature in September is also lower at 14°C (58°F), while August boasts a warmer average of 17°C (62°F). Additionally, September experiences a maximum temperature of 29°C (84°F), which is significantly cooler than August's peak of 33°C (91°F). Rainfall is also affected, as September has 53 mm (2.1 in) of precipitation over 8 days, while August sees a higher total of 73 mm (2.9 in) over 12 days. Humidity levels are slightly higher in September at 82%, compared to 76% in August. For more details, you can check Gloucester weather in August.

September and October present a notable shift in weather conditions. In September, temperatures range from a low of 3°C (37°F) to a high of 29°C (84°F), with an average of 14°C (58°F). The month sees relatively mild precipitation levels at 53 mm (2.1 in) over 8 days and humidity is at 82%. In contrast, October brings cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 23°C (74°F), averaging 11°C (53°F). Rainfall increases significantly to 96 mm (3.8 in) over 14 days, accompanied by higher humidity levels at 90%. For a detailed look at October weather patterns, check out Gloucester weather in October.

September and November exhibit distinct differences in weather patterns. September typically offers milder temperatures, ranging from a minimum of 3°C (37°F) to a maximum of 29°C (84°F), with an average temperature of 14°C (58°F). The month sees about 53 mm (2.1 in) of precipitation over approximately 8 days and an average humidity of 82%. In contrast, November experiences colder conditions, with temperatures ranging from -3°C (27°F) to 17°C (62°F) and an average of 8°C (46°F). This month also brings increased precipitation, totaling 65 mm (2.6 in) over 13 days, and higher humidity levels at 92%. For more detailed insights, you can refer to Gloucester weather in November.

September and December present a stark contrast in weather conditions. In September, temperatures range from a mild 3°C (37°F) to a warm 29°C (84°F), with an average of 14°C (58°F). The month experiences approximately 53 mm (2.1 in) of precipitation over about 8 days, alongside a relatively high humidity of 82%. In contrast, December sees much colder temperatures, with a minimum of -8°C (19°F), an average of 6°C (44°F), and a maximum of 14°C (57°F). This month also has higher precipitation levels, totaling 86 mm (3.4 in) across approximately 15 days, and even greater humidity at 92%. For a detailed look at the climate during this time, you can visit Gloucester weather in December.

Compare Gloucester's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Gloucester

As summer transitions to autumn, September in Gloucester showcases a unique blend of weather characteristics that differ from other months of the year. Temperatures can soar to pleasant highs, inviting outdoor activities, while the average cools down significantly, hinting at the approaching fall. Rainfall, while present, tends to be moderate, with occasional showers that nourish the landscape but seldom disrupt daily plans. The elevated humidity levels create a rich, soothing atmosphere, making it a perfect time for those who enjoy the freshness of early autumn. For a more detailed overview of Gloucester's climate trends throughout the year, explore Gloucester Climate.