September Weather in Chester, United Kingdom

Last updated: March 17, 2025

In Chester, United Kingdom, September brings a delightful blend of warm and cool temperatures, with highs reaching a balmy 27°C (81°F) and average daily temperatures around 14°C (58°F). However, evenings can cool down significantly, with lows dipping to 3°C (37°F). This month also witnesses 93 mm (3.7 in) of rainfall spread over 14 days, resulting in a noticeably humid environment at 85%. Visitors can expect a mix of sunny spells and occasional showers, making it a charming time to explore the historical beauty of Chester.

September Temperature in Chester

As September unfolds in Chester, UK, a delightful transition from summer's warmth to the crispness of autumn becomes evident. With temperatures ranging from a minimum of 3°C (37°F) to a pleasant maximum of 27°C (81°F), the month presents a comfortable average of 14°C (58°F). This gradual cooling trend follows the peak warmth of August and hints at the chillier days ahead, as evident from the approaching October averages. Overall, September offers a refreshing blend of warm days and brisk evenings, making it an ideal time for outdoor explorations before the chill of fall settles in.

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

The chart illustrates September temperature patterns in Chester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424345485460626157524743
Data source: Temperature data for Chester 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 Chester

In Chester, September marks a transitional period in precipitation, featuring an average of 93 mm (3.7 in) of rainfall over 14 days. This volume reflects a slight decrease from August's peak of 102 mm, yet still maintains a significant presence as it bridges the gap into autumn. The weather remains unsettled, with rainfall patterns often seen through mid-month, suggesting that while summer's warmth may linger, the shift towards wetter autumn conditions is underway. This trend of accumulating rainfall in late summer to early autumn captures a key aspect of Chester's evolving climate, as residents prepare for the brisk, rainier days ahead.

September Precipitation Trends in Chester

The chart displays monthly precipitation patterns in Chester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6474825168929710293947696
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chester

As September arrives in Chester, the humidity levels settle at a moderate 85%, reflecting the transition from summer's warmth to autumn's cooler embrace. Following the relatively drier months of July and August, where humidity dipped to 78% and 79% respectively, September marks a brief resurgence in moisture. This increase hints at the changing season, as the air begins to retain more humidity in anticipation of the wetter months ahead. The trend is clear: as the year progresses, Chester's humidity trends upward, culminating in the high levels of 90% seen in October and peaking again in November with 91%. This cycle not only influences local weather patterns but also the overall ambiance of the charming city as it prepares for the cozy months of fall.

September Average Humidity in Chester

This chart illustrates the average monthly humidity levels in Chester, 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%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chester

As summer fades into autumn, Chester experiences a shift in the UV Index during September, which stands at 5—falling into the moderate exposure category. This marks a notable decrease from the very high levels of 8 seen in the peak summer months of June and July. While the burn time increases to a manageable 30 minutes, it's still wise to take precautions, especially for those with sensitive skin. With a gradual decline in UV intensity throughout the month, it's an excellent time to enjoy the mild weather while being mindful of sun exposure. For detailed information on daily UV levels, visit Chester UV Index.

Maximum UV Index Levels in Chester for September

The chart shows the monthly maximum UV Index (UVI) for Chester 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.
JanFebMarAprMayJunJulAugSepOctNovDec123578875421
Data source: Chester 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 Chester

As the vibrant hues of summer fade, September in Chester, United Kingdom, offers a delightful mix of warmth and sunshine, with 286 hours of daylight marking a gradual decline from the peak of high summer. Following the splendid sun-filled months of July and August, where nearly 400 hours of sunlight reign, September ushers in the serene transition to autumn. Despite the decrease, the month still enjoys a robust share of sunshine, comfortably surpassing the dreary early winter months just around the corner. This period serves as a gentle reminder of nature’s cycles, inviting locals and visitors alike to bask in the last golden rays before the year’s end.

Monthly Sunshine Duration in Chester: September Highlighted

The September sunshine duration represents the total number of hours Chester 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.
JanFebMarAprMayJunJulAugSepOctNovDec85h147h202h316h390h365h396h360h286h219h109h95h
Data source: Chester September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chester During September

In Chester, United Kingdom, the likelihood of enjoying sunny weather in September stands at 23%, which is slightly below the summer months but in line with the transitional nature of early autumn. This month shares the spotlight with February, March, and June, each showcasing a comparable chance for sunshine. Interestingly, while April boasts the highest likelihood of clear skies at 47%, September tends to signal the onset of more variable weather patterns, with cloud cover often encroaching as the days grow shorter. As autumn approaches, it’s a reminder that while September can still bless us with some radiant days, residents should remain prepared for the whims of a more unpredictable climate.

Percentage of Sunny Days in September in Chester

The chart illustrates the percentage of sunny days in Chester 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 Chester experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%24%24%47%30%24%36%24%23%21%28%15%
Data source: Chester September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chester in September

As summer transitions into autumn, September in Chester, United Kingdom, sees a notable shift in daylight duration, offering about 12 hours of light. Following the sun-drenched days of July and August, which bathed the region in 16 and 14 hours of daylight respectively, September marks a gentle decline as daylight hours shorten. This gradual reduction is a herald of the colder months ahead, contrasting sharply with January's mere 8 hours. The month serves as a bridge between the long, bright days of summer and the more limited sunlight that characterizes the fall and winter seasons, allowing residents and visitors alike to relish the rich hues of early autumn before the days dwindle further.

Average Daylight Hours in Chester for September

The chart illustrates the variation in daylight duration in Chester throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 8m9h 50m11h 54m14h 1m15h 53m16h 52m16h 21m14h 40m12h 37m10h 30m8h 36m7h 35m
Data source: Chester daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Chester

As summer transitions to autumn, September in Chester, United Kingdom, typically showcases a gentle average wind speed of 2.9 m/s (6 mph), mirroring the calm breezes of July and June. This gentle airflow is characteristic of the month, providing a soothing backdrop as the leaves begin to change. Interestingly, the winds pick up again in October, reaching 4.4 m/s (10 mph), hinting at the impending shift towards cooler, more robust gusts typical of late fall. Overall, September reflects a quieter phase in the annual weather cycle, a time when the winds are soft yet heralding the energetic breezes of autumn.

Average September Wind Speed in Chester

The chart displays monthly wind speed patterns in Chester, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.74.64.33.03.72.92.73.22.9 m/s4.44.04.3
Data source: Chester September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Chester Compares to Other Months

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

September and January weather exhibit significant contrasts. In September, temperatures range from a mild 3°C (37°F) at night to a warm 27°C (81°F) during the day, with an average of 14°C (58°F). The month experiences relatively higher precipitation with 93 mm (3.7 in) over about 14 days, paired with humidity levels around 85%. In contrast, January is considerably colder, with temperatures dipping to a low of -3°C (26°F) and peaking at 14°C (58°F), resulting in a much lower average of 5°C (42°F). Although January sees less precipitation at 63 mm (2.5 in) over 11 days, it has a slightly higher humidity level of 89%. For more detailed insights on Chester’s weather patterns, check out Chester weather in January.

September and February exhibit stark contrasts in weather. September enjoys a milder climate with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 27°C (81°F), and significantly more warmth with an average of 14°C (58°F). On the other hand, February presents cooler conditions, with temperatures dipping as low as -4°C (25°F) and peaking at 17°C (63°F), leading to an average of just 6°C (43°F). While September experiences higher rainfall with 93 mm (3.7 in) over 14 days, February sees somewhat less precipitation at 74 mm (2.9 in), yet maintains a slightly higher humidity level of 88%. For more detailed insights into February weather, you can explore Chester weather in February.

In September, the weather typically ranges from a mild 3°C (37°F) at night to a warmer 27°C (81°F) during the day, with an average temperature of 14°C (58°F). The month sees about 93 mm (3.7 in) of precipitation over approximately 14 days, accompanied by high humidity levels around 85%. In contrast, March presents a cooler climate, with temperatures dropping to a minimum of -5°C (23°F) and peaking at 20°C (69°F), averaging 7°C (45°F). The precipitation level is slightly lower at 82 mm (3.2 in), occurring on about 15 days, with humidity slightly higher at 86%. These differences highlight the transition from the warmth of late summer in September to the still-chilly early spring of March. For more detailed information, you can explore Chester weather in March.

September and April exhibit distinct weather characteristics. In September, temperatures range from a minimum of 3°C (37°F) to a comfortable average of 14°C (58°F), reaching a maximum of 27°C (81°F). This month experiences a total precipitation of 93 mm (3.7 in) over about 14 days, accompanied by a high humidity level of 85%. In contrast, April has cooler temperatures with a minimum of -1°C (30°F) and an average of 9°C (49°F), peaking at 22°C (72°F). It sees less rain, with 51 mm (2.0 in) falling over approximately 10 days, and humidity is slightly lower at 84%. For more details, check Chester weather in April.

In comparing the weather between September and May, both months showcase similar maximum temperatures, with September peaking at 27°C (81°F) and May at 27°C (80°F). However, September tends to be slightly warmer overall, with an average temperature of 14°C (58°F) compared to May's 12°C (54°F). Rainfall is more abundant in September, with 93 mm (3.7 in) over 14 days, while May experiences less precipitation at 68 mm (2.7 in) across 13 days. Additionally, September maintains a higher humidity level of 85%, whereas May's humidity is slightly lower at 79%. For more detailed information on weather patterns, you can check Chester weather in May.

In June, the weather in Chester is generally mild with temperatures ranging from a minimum of 6°C (43°F) to a comfortable maximum of 29°C (84°F), while September sees slightly cooler temperatures with a minimum of 3°C (37°F) and a maximum of 27°C (81°F). Both months experience similar precipitation levels, with June having 92 mm (3.6 in) and September slightly higher at 93 mm (3.7 in), leading to rain on about 14 days in each month. Humidity is a touch higher in September at 85%, compared to June’s 81%, adding to the feeling of dampness as summer transitions into autumn. For a detailed look at June's weather, visit Chester weather in June.

September and July showcase distinct weather patterns, with September experiencing a broader temperature range, with minimums dipping to 3°C (37°F) and maximums reaching 27°C (81°F). In contrast, July typically features warmer conditions, with minimum temperatures around 7°C (45°F) and highs peaking at 29°C (85°F). Both months see a similar level of precipitation, with September receiving 93 mm (3.7 in) over about 14 days and July slightly higher at 97 mm (3.8 in) over 15 days. While humidity is higher in September at 85%, July enjoys a lower humidity level of 78%, making it feel a bit more comfortable despite the warmer temperatures. For a closer look at July's weather specifics, you can visit Chester weather in July.

In comparing the weather of September to August, we observe a noticeable shift in temperature and precipitation patterns. September experiences a wider range of temperatures, with a minimum of 3°C (37°F) and a maximum of 27°C (81°F), leading to a lower average of 14°C (58°F) compared to August's milder minimum of 7°C (46°F) and maximum of 30°C (85°F) with an average of 16°C (62°F). While August sees slightly higher precipitation at 102 mm (4.0 in) over 16 days, September follows closely with 93 mm (3.7 in) across 14 days, although the humidity increases to 85% in September, compared to 79% in August. For more detailed insights into August's weather, check out Chester weather in August.

September weather features a mild temperature range with minimums around 3°C (37°F) and maximums peaking at 27°C (81°F), leading to an average of 14°C (58°F). The month experiences around 93 mm (3.7 in) of precipitation over 14 days, with humidity levels at 85%. In contrast, October brings cooler temperatures, with minimums dipping to -2°C (29°F) and maximums reaching 22°C (71°F), averaging 11°C (53°F). The precipitation slightly increases to 94 mm (3.7 in) spread over 16 days, accompanied by higher humidity at 90%. For a more detailed look at October weather, check out Chester weather in October.

In comparing the weather between September and November, we notice a significant drop in temperatures. September typically enjoys a mild average temperature of 14°C (58°F), with highs reaching up to 27°C (81°F), while November sees a much cooler average of 8°C (47°F), with maximum temperatures peaking at 17°C (62°F). Additionally, September experiences more pleasant conditions with less precipitation (93 mm over 14 days) compared to November, which, despite slightly lower total rainfall (76 mm over 16 days), has a higher humidity level at 91%. For more detailed insights into November weather in Chester, you can check Chester weather in November.

In September, the weather is generally warmer, with temperatures ranging from a cool 3°C (37°F) to a pleasant 27°C (81°F) and an average of 14°C (58°F). There is a fair amount of precipitation as well, with 93 mm (3.7 in) falling over 14 days, and humidity levels sitting at 85%. In contrast, December brings much colder conditions, with temperatures dropping to a minimum of -4°C (24°F) and only reaching a maximum of 14°C (57°F), averaging 6°C (44°F). Precipitation slightly increases to 96 mm (3.8 in) over 17 days, with humidity rising to 89%. For more detailed information, you can check Chester weather in December.

Compare Chester's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Chester

In September, Chester experiences a unique transition in weather, marking the shift from the warmth of summer to the coolness of autumn. The warmest days still see temperatures peak at around 27°C (81°F), but the average dips to a more moderate 14°C (58°F), bringing a refreshing change. With humidity levels climbing to 85% and precipitation occurring on about half the days of the month, the air takes on a distinct crispness. This blend of rainy days and milder temperatures sets September apart from the hotter, drier months of summer, inviting residents and visitors alike to enjoy the changing scenery and the onset of fall. For a deeper dive into Chester's climate trends, check out Chester Climate.