September Weather in St Albans, United Kingdom

Last updated: March 17, 2025

In St Albans, United Kingdom, September weather offers a delightful mix of warmth and refreshing coolness. With a maximum temperature reaching 28°C (83°F) and an average of 15°C (59°F), early autumn days present a comfortable climate ideal for outdoor activities. However, as temperatures dip to a minimum of 3°C (38°F) during the night, a light jacket is recommended. Precipitation is moderately frequent, with 49 mm (1.9 in) spread across 10 days, contributing to the area's lush landscapes. The humidity remains high at 82%, creating a distinctly crisp and invigorating atmosphere that characterizes this transitional month. Overall, September in St Albans feels vibrant and fresh, a perfect time to explore the city's rich heritage.

September Temperature in St Albans

In September, temperatures in St Albans, United Kingdom, begin to hint at the crispness of autumn, with minima around 3°C (38°F) and average highs reaching a comfortable 28°C (83°F). This month typically showcases a delightful blend of summer's lingering warmth and the cool breezes of fall, making it ideal for outdoor activities. While the average temperature settles at a mild 15°C (59°F), September often serves as a transition, as the long, warm days of summer gradually give way to cooler nights. Overall, this month presents a pleasant and inviting climate, perfect for enjoying the changing leaves and fresh autumn air.

September Weather in St Albans: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in St Albans, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404345495561656459534643
Data source: Temperature data for St Albans 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 St Albans

In September, St Albans experiences a modest precipitation total of 49 mm (1.9 in), making it one of the drier months of the year, yet still consistent with the typical English climate. Rainfall occurs over 10 days, reflecting a stable transition into autumn. The overall trend shows a decrease from the wetter summer months, where August recorded 72 mm (2.8 in). This gradual reduction in precipitation is accompanied by a shift in weather patterns, as the arrival of October heightens rainfall significantly to 86 mm (3.4 in). Thus, September serves as a bridge, gently easing the vibrant, rain-soaked summer into the more abundant autumn showers that lie ahead.

September Precipitation Trends in St Albans

The chart displays monthly precipitation patterns in St Albans, 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.
JanFebMarAprMayJunJulAugSepOctNovDec545156326574677249865183
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in St Albans

In September, St Albans experiences a notable shift in humidity, averaging 82%, which marks a slight increase from the drier summer months. As the seasons transition from the warmth of August's 76%, the air becomes noticeably more humid, hinting at the impending autumn. This uptick sets the stage for the consistent rise in humidity that characterizes the approaching months, with October and November ramping up to 90% and 92%, respectively. Overall, September serves as a bridge between the drier summer and the dampness of fall, reflecting the dynamic weather patterns typical of this charming UK locale.

September Average Humidity in St Albans

This chart illustrates the average monthly humidity levels in St Albans, 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 St Albans

As September rolls into St Albans, the UV Index sits at a high level of 6, indicating that sun protection is still crucial for outdoor activities. This slight dip from the peak summer values reflects the gradual transition into autumn, where the burn time remains consistent at 25 minutes. Throughout the month, locals and visitors alike should enjoy the relatively warm weather, while keeping an eye on the UV levels, especially following the very high indices of 8 noted in both June and July. Observing the trends, it's clear that while the UV Index begins to decline after the summer months, it still demands attention through September. For more detailed information, check out the St Albans UV Index.

Maximum UV Index Levels in St Albans for September

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

As September unfolds in St Albans, the city basks in a generous 300 hours of sunshine, marking a graceful transition from the vibrant summer months. This is a slight dip from August's 368 hours, yet it comfortably surpasses the dreary winter months, where sunshine dwindles to around 109 hours in December. The trend is clear: as the year progresses, sunny days reach their zenith in the summer, with July leading at 404 hours, before gradually tapering down as autumn approaches. September offers a blend of lingering warmth and the festive onset of fall, making it a delightful time to enjoy the outdoors before the days grow noticeably shorter.

Monthly Sunshine Duration in St Albans: September Highlighted

The September sunshine duration represents the total number of hours St Albans 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.
JanFebMarAprMayJunJulAugSepOctNovDec98h148h210h319h398h389h404h368h300h241h144h109h
Data source: St Albans September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in St Albans During September

In St Albans, the likelihood of sunny weather in September stands at 29%, reflecting a slight dip compared to the sunnier months of April and May, which boast probabilities of 48% and 31% respectively. As summer transitions into autumn, September aligns closely with the patterns observed in the preceding months of June and July. While the chances of sunshine are less than ideal compared to the bright days of late spring, the month retains a reasonable probability for enjoying some sun. Overall, September serves as a gentle reminder that while the summer warmth begins to fade, opportunities for lovely, sunny days are still on the horizon.

Percentage of Sunny Days in September in St Albans

The chart illustrates the percentage of sunny days in St Albans 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 St Albans experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%25%28%48%31%27%38%24%29%24%32%16%
Data source: St Albans September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in St Albans in September

As summer gives way to autumn in St Albans, September sees a notable shift in daylight duration, with approximately 12 hours of sunlight illuminating the days. This gradual decline from the 16 hours of brightness typical in peak summer months reflects the natural progression towards shorter days. Following the vibrant days of August at 14 hours, September marks a transitional period, where the crisp air begins to hint at the cozy embrace of fall. This trend of diminishing daylight continues into the next months, with October dropping to 10 hours and November further reducing to 8 hours, signaling the approaching winter. Such fluctuations in daylight not only influence the landscape but also set the tone for seasonal activities and the vibrant colors that paint the scenery.

Average Daylight Hours in St Albans for September

The chart illustrates the variation in daylight duration in St Albans 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 54m15h 39m16h 34m16h 4m14h 30m12h 35m10h 36m8h 49m7h 52m
Data source: St Albans daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in St Albans

As September arrives in St Albans, the average wind speed drops to 3.4 m/s (8 mph), reflecting a gentle transition towards the cooler autumn months. This slight decline is consistent with the trend observed throughout the summer, where wind speeds remained relatively mild, peaking at 4.0 m/s (9 mph) in August. Notably, September mirrors the lighter breezes typical of June and July, suggesting a calming atmosphere as nature shifts. Following the summer lull, wind speeds are set to rise again in October, hinting at the more robust gusts that often accompany the arrival of autumn gales. This rhythmic ebb and flow of wind reflects the changing seasons, inviting residents and visitors alike to experience the tranquil beauty of St Albans in September.

Average September Wind Speed in St Albans

The chart displays monthly wind speed patterns in St Albans, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.94.63.54.33.33.44.03.4 m/s4.64.14.6
Data source: St Albans September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in St Albans Compares to Other Months

The weather in St Albans 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 St Albans and find detailed weather information for every month.

September and January present quite contrasting weather patterns. In September, temperatures range from a mild 3°C (38°F) to a warm 28°C (83°F), with an average of 15°C (59°F). The month sees moderate precipitation at 49 mm (1.9 in) over about 10 days, with humidity levels around 82%. On the other hand, January experiences much cooler conditions with temperatures ranging from a low of -5°C (24°F) to a maximum of 14°C (58°F), averaging just 5°C (41°F). It also has slightly higher precipitation at 54 mm (2.1 in) over the same number of days, and higher humidity at 91%. For more detailed insights, you can visit St Albans weather in January.

September weather is characterized by milder temperatures, with averages around 15°C (59°F) and highs reaching up to 28°C (83°F), making it a pleasant month for outdoor activities. In contrast, February sees significantly colder conditions, with average temperatures dropping to 6°C (43°F) and lows dipping to -6°C (22°F). Both months experience similar levels of precipitation, with September receiving 49 mm (1.9 in) over 10 days and February slightly higher at 51 mm (2.0 in) over 11 days. Additionally, February tends to be more humid with a humidity level of 89% compared to September's 82%. For more detailed information, check St Albans weather in February.

When comparing the weather in September and March, one can observe notable differences in temperature and precipitation patterns. September generally enjoys milder conditions, with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), whereas March experiences a chillier climate, with temperatures spanning from -6°C (22°F) to 22°C (71°F). Despite September being warmer on average, it still sees about 49 mm (1.9 in) of precipitation over approximately 10 days, while March has slightly higher precipitation at 56 mm (2.2 in) over 13 days. Additionally, both months exhibit high humidity, with March just edging out September at 86% compared to 82%. For a closer look at the specifics of March weather, check out St Albans weather in March.

When comparing the weather in September and April, notable differences emerge. September typically features a wider temperature range, with minimums around 3°C (38°F) and maximums soaring to 28°C (83°F), while April sees cooler expectations, with a low of -2°C (29°F) and a high of 27°C (80°F). Precipitation is slightly higher in September, averaging 49 mm (1.9 in) over about 10 days, compared to April's 32 mm (1.3 in) over 8 days. Humidity levels are also comparable, with September at 82% and April slightly higher at 85%. For more details on the weather in April, you can check St Albans weather in April.

In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 28°C (83°F), with an average of 15°C (59°F). This month experiences around 49 mm (1.9 in) of precipitation over approximately 10 days, and humidity levels are relatively high at 82%. Conversely, May tends to have slightly cooler weather with a minimum temperature of 2°C (35°F) and a maximum of 26°C (79°F), averaging 13°C (55°F). Although May has more precipitation at 65 mm (2.5 in) over 11 days, the humidity is somewhat lower at 79%. For more specific information on May weather in St Albans, check out St Albans weather in May.

In comparing the weather between September and June, we see notable differences in temperature and precipitation. September experiences slightly cooler temperatures, with a minimum of 3°C (38°F) and an average of 15°C (59°F), peaking at 28°C (83°F). In contrast, June has a milder minimum of 7°C (45°F) and an average temperature of 16°C (62°F), with a maximum of 31°C (88°F). Interestingly, while September's precipitation is lower at 49 mm (1.9 in), June sees more rain with 74 mm (2.9 in), despite both months experiencing rainfall on about 10 days. Humidity remains fairly high in both months, at 82% in September and 80% in June. For more details on June's weather patterns, check out St Albans weather in June.

In September, temperatures range from a cool minimum of 3°C (38°F) to a warm maximum of 28°C (83°F), with an average temperature of 15°C (59°F). This month experiences a higher humidity level at 82% and receives about 49 mm (1.9 in) of precipitation over 10 days. In contrast, July boasts warmer temperatures, with a minimum of 9°C (48°F) and a maximum reaching up to 36°C (96°F), averaging 18°C (65°F). While it is generally drier than September, July still records about 67 mm (2.6 in) of rainfall across 12 days and enjoys lower humidity at 71%. For more detailed information, you can check out St Albans weather in July.

In comparing the weather from August to September, we notice a significant drop in temperatures, with September experiencing a minimum of 3°C (38°F) compared to August's 8°C (47°F). The average temperature also declines from 18°C (64°F) in August to 15°C (59°F) in September, while the maximum temperature in September reaches 28°C (83°F), significantly lower than August’s high of 34°C (93°F). Additionally, September sees more frequent rain, with precipitation on 10 days amounting to 49 mm (1.9 in), though this is less than August's 72 mm (2.8 in) over 13 days. Despite the increased rainfall in terms of days, September's humidity is higher at 82%, compared to August's 76%. For a more detailed look at August's weather, visit St Albans weather in August.

September and October showcase a notable transition in weather patterns. In September, temperatures range from a comfortable minimum of 3°C (38°F) to a warm average of 15°C (59°F), reaching a maximum of 28°C (83°F), while rainfall totals about 49 mm (1.9 in) across 10 days. Contrastingly, October brings cooler temperatures, with a minimum of 1°C (34°F) and an average of 12°C (53°F), peaking at 23°C (73°F). Additionally, it experiences increased precipitation, totaling 86 mm (3.4 in) over 12 days, and greater humidity at 90%. For more detailed insights, check out St Albans weather in October.

In September, St Albans experiences a milder climate, with temperatures ranging from a minimum of 3°C (38°F) to a warm maximum of 28°C (83°F) and an average of 15°C (59°F). The month sees 49 mm (1.9 in) of precipitation, spread over about 10 days, and a relative humidity of 82%. In contrast, November ushers in colder conditions, with temperatures dipping to a minimum of -2°C (29°F) and an average of 8°C (46°F), while the maximum reaches only 16°C (62°F). Precipitation slightly increases to 51 mm (2.0 in), also over 10 days, and humidity rises to 92%. For more information, you can check St Albans weather in November.

In September, temperatures range from a mild 3°C (38°F) at night to a warm average of 15°C (59°F) during the day, peaking at a comfortable 28°C (83°F). The month experiences about 49 mm (1.9 in) of precipitation over 10 days, with humidity levels sitting at 82%. In contrast, December ushers in a significant drop in temperatures, with minimums plunging to -5°C (23°F) and averaging just 6°C (43°F), reaching a maximum of 14°C (58°F). This cooler month also sees increased precipitation, totaling 83 mm (3.3 in) over 14 days, and a higher humidity level of 92%. For more detailed information, check out St Albans weather in December.

Compare St Albans's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in St Albans

As the summer transitions into autumn, September in St Albans brings a refreshing variation in weather. With temperatures experiencing a gentle decline, the month showcases a pleasant balance between warm days and cooler nights, making it distinct from the sweltering summer months. Although there might be an increase in precipitation compared to the drier summer period, the humidity remains relatively high, creating a unique atmosphere. As you explore the beauty of St Albans in September, you'll find this transitional period both invigorating and enchanting. For a deeper dive into the climate trends, check out St Albans Climate.