Last updated: March 17, 2025
In September, Letchworth Garden City experiences a delightful transition as summer gives way to autumn, showcasing a maximum temperature of 29°C (84°F) and an average of 15°C (59°F). As the days shorten, the weather brings a refreshing chill, with minimum temperatures dropping to 3°C (37°F). This month also sees about 52 mm (2.0 in) of precipitation over 9 days, contributing to a humidity level of 82% that adds to the crispness of the air. Residents and visitors can enjoy a vibrant tapestry of changing leaves while keeping an umbrella handy for the occasional shower.
As summer fades into autumn, September in Letchworth Garden City brings a noticeable shift in temperatures. The month starts with minimums around 3°C (37°F), making the mornings crisp and invigorating, while the afternoons can still reach a pleasant maximum of 29°C (84°F). With an average temperature of 15°C (59°F), September offers a delightful blend of warmth and coolness, perfect for enjoying the last vestiges of outdoor activities before the chill of October sets in. This transition is evident in the substantial drop from the sweltering highs of August, emphasizing September as a month of change and a gentle reminder of the approaching autumn.
In September, Letchworth Garden City experiences a delightful transition into autumn, marked by an average precipitation of 52 mm (2.0 in) over 9 days. This amount is notably lower than the preceding summer months, reflecting a gradual decrease in rainfall as the region prepares for the wetter fall season. Whereas August saw 71 mm of rain during 12 days, September’s drier climate allows for more pleasant outdoor activities. As we look ahead to October, a substantial uptick in average rainfall is expected, with 87 mm (3.4 in) projected, heralding a shift back to the wetter pattern typical of the autumn months. This trend showcases a rhythmic seasonal pattern that brings both the lush greenery of summer and the crisp, refreshing air of fall to Letchworth Garden City.
In September, Letchworth Garden City experiences a moderate humidity level of 82%, a slight uptick from the drier summer months of July (71%) and August (76%). This increase hints at the transition into autumn, where the air begins to feel a bit more damp, preparing the landscape for the brisker months ahead. Comparatively, the humidity in September is comfortably lower than that of the winter months, where levels soar back to 90% and beyond in October and November. This seasonal shift creates a unique blend of crispness in the air, making September a fascinating time in Letchworth as the vibrant summer greenery prepares to yield to the warm hues of fall.
As September unfolds in Letchworth Garden City, the UV Index settles at a comfortable 6, indicating a high exposure category with a burn time of just 25 minutes. This marks a slight decline from the peak summer months, as August recorded a UV Index of 7. While the days are still sunny and inviting, residents and visitors should remain mindful of sun protection, particularly as the cooler autumn air approaches. The transition from the very high levels noted in June and July to September's high index shows a gradual easing of the sun's intensity, making it essential to enjoy outdoor activities while still being cautious. For more details on how UV levels change throughout the year, explore Letchworth Garden City UV Index.
UV Risk Categories
As summer wanes, September in Letchworth Garden City brings a delightful transition with an impressive 290 hours of sunshine. This marks a noticeable decline from the sun-drenched heights of July and August, yet remains vibrant when compared to the earlier months of the year. The gradual decrease in sunlight echoes the natural shift of seasons, transitioning from the peak summer days with over 390 hours to the cozy, golden hues of fall. While autumn's arrival is heralded by shorter days, September's bright afternoons offer a lingering warmth, inviting residents and visitors alike to savor the outdoor beauty of this charming garden city before the chill of winter sets in.
In Letchworth Garden City, the likelihood of sunny weather in September stands at 29%, showcasing a modest glimmer of sunshine as summer wanes. This percentage slightly eclipses the sunniest months of January and October, which both offer 21% and 22% chances respectively. While September's sunny likelihood dips compared to the peak of April at 48%, it does outshine the cloudy vibes of June and August. As autumn approaches, the weather patterns hint at a gradual transition away from the warmer, sunnier days, with the sun peeking out intermittently, making September a delightful, albeit unpredictable, time to enjoy the outdoors in this charming corner of the UK.
As summer fades into autumn, September in Letchworth Garden City offers a gentle transition with approximately 12 hours of daylight. This marks a noticeable decline from the sun-drenched 16 hours enjoyed in June and July. While the daylight begins to wane, September still retains a generous amount of sunshine compared to the earlier winter months. This gradual decrease heralds the onset of shorter days ahead, compelling residents and visitors alike to savor the lingering warmth of late summer before the crispness of autumn takes hold. The decline continues into October, where daylight reduces to 10 hours, illustrating a clear trend toward the darker months as the year draws to a close.
As September arrives in Letchworth Garden City, residents and visitors can expect a gentle breeze, with average wind speeds around 3.6 m/s (8 mph). This marks a slight decline from the lively gusts of August. Following the summer months, where winds peak at 4.1 m/s (9 mph), September introduces a calmer atmosphere, reminiscent of the transition into autumn. Interestingly, this month’s wind speed trails slightly below the average of earlier months, yet aligns with the quieter patterns seen typically in late summer. As the days shorten and the leaves begin to change, the soft winds of September create a serene backdrop, encouraging moments of reflection in the tranquil gardens of this charming town.
The weather in Letchworth Garden City 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 Letchworth Garden City and find detailed weather information for every month.
In September, temperatures in Letchworth Garden City typically range from a chilly 3°C (37°F) at night to a warm 29°C (84°F) during the day, with an average of 15°C (59°F). The month experiences around 52 mm (2.0 in) of precipitation over approximately 9 days, accompanied by a relatively high humidity level of 82%. In contrast, January brings much colder temperatures, with a minimum of -4°C (25°F) and a maximum of 14°C (58°F), averaging just 5°C (41°F). Precipitation slightly increases to 54 mm (2.1 in) over the same number of days, but humidity rises to 91%. For more detailed information, check out Letchworth Garden City weather in January.
Overall, January's weather is significantly cooler and wetter compared to the relatively mild and drier conditions of September.
In comparing the weather between September and February, September typically presents milder conditions, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 29°C (84°F), while February is noticeably colder, with temperatures averaging between -6°C (21°F) and 18°C (65°F). Precipitation levels are quite similar in both months, with September recording 52 mm over 9 days and February slightly lower at 49 mm over 11 days. Humidity is higher in February at 89%, compared to September's 82%, contributing to a generally chillier and wetter atmosphere during the winter month. For more information, you can check out Letchworth Garden City weather in February.
In comparing the weather of September and March, September tends to be warmer, with average temperatures ranging from a cool 15°C (59°F) to a warm 29°C (84°F), while March experiences a chillier range from -6°C (22°F) to a maximum of 22°C (71°F). Both months see similar levels of precipitation, with September receiving about 52 mm (2.0 in) over 9 days and March slightly higher at 56 mm (2.2 in) over 13 days. Additionally, March has a higher average humidity at 86%, compared to September's 82%. For more detailed information about the weather in March, you can visit Letchworth Garden City weather in March.
In comparing the weather between September and April, September generally offers warmer temperatures, with a minimum of 3°C and an average high of 29°C, while April starts off cooler with temperatures dipping to a minimum of -2°C and an average high of 27°C. Humidity levels sit slightly higher in September at 82% compared to April's 85%. Additionally, September experiences more precipitation, totaling 52 mm over 9 days, whereas April records only 34 mm of rain across 8 days. For a more detailed look at April's climate, you can check out Letchworth Garden City weather in April.
When comparing the weather in September to that in May, it is clear that September boasts slightly warmer temperatures, with an average of 15°C (59°F) compared to May's 13°C (55°F). The maximum temperatures in September reach up to 29°C (84°F), while May peaks at 27°C (80°F). However, September experiences less precipitation, recording 52 mm (2.0 in) over 9 days, whereas May sees 68 mm (2.7 in) of rain across 12 days. Both months maintain high humidity levels, with September at 82% and May slightly lower at 79%. For more in-depth information about May weather conditions, check out Letchworth Garden City weather in May.
In comparing the weather of September and June, we see distinct characteristics that define each month. September tends to be milder, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 29°C (84°F) and an average around 15°C (59°F). It experiences relatively low precipitation at 52 mm (2.0 in) over about 9 days, coupled with a higher humidity level of 82%.
In contrast, June showcases warmer conditions with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 31°C (88°F), averaging 16°C (61°F). However, it sees slightly more rainfall at 72 mm (2.8 in) over approximately 10 days and maintains a comparable humidity level of 80%. For more detailed insights, you can check Letchworth Garden City weather in June.
When comparing the weather in September and July, notable differences emerge. September experiences a broader temperature range, with minimums dipping to 3°C (37°F) and maximums reaching 29°C (84°F), averaging around 15°C (59°F). In contrast, July typically boasts higher temperatures, with a minimum of 8°C (47°F) and a maximum soaring to 36°C (97°F), averaging 18°C (65°F). Precipitation levels are also a factor, where September sees 52 mm (2.0 in) of rainfall over 9 days, while July has 66 mm (2.6 in) across 13 days. Additionally, September's humidity is higher at 82%, compared to July's 71%. For more specific insights on July weather in a particular location, you can refer to Letchworth Garden City weather in July.
In comparing the weather between August and September, we see a noticeable shift in temperature and precipitation patterns. September experiences cooler temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), compared to August, which has a milder minimum of 8°C (47°F) and an average of 18°C (64°F). The maximum temperature in September reaches 29°C (84°F), significantly lower than August's peak of 34°C (94°F). While both months see rainfall, September has a total precipitation of 52 mm (2.0 in) over 9 days, which is less than August's 71 mm (2.8 in) over 12 days. Additionally, September is more humid, with a humidity level of 82%, compared to August's 76%. For more detailed insights into August’s weather, check out Letchworth Garden City weather in August.
September and October showcase a notable shift in weather patterns. In September, temperatures are generally warmer, with minimums around 3°C (37°F) and maximums reaching up to 29°C (84°F), while the average is a comfortable 15°C (59°F). However, this month experiences less rainfall, totaling 52 mm (2.0 in) over 9 days. In contrast, October brings cooler conditions, with a minimum temperature dropping to 0°C (33°F) and an average of 11°C (53°F), peaking at 23°C (74°F). Additionally, precipitation increases to 87 mm (3.4 in) across 12 days, and humidity rises to 90%. For a detailed look at how the weather in October compares to other months, check Letchworth Garden City weather in October.
September and November present a stark contrast in weather conditions. September features a milder temperature range with a minimum of 3°C (37°F) and an average of 15°C (59°F), peaking at a warm 29°C (84°F). This month experiences about 52 mm (2.0 in) of precipitation over 9 days, with a humidity level of 82%. In contrast, November brings cooler weather, with temperatures dropping to a minimum of -2°C (28°F) and an average of 8°C (46°F), reaching a maximum of only 17°C (63°F). Precipitation remains similar at 52 mm (2.0 in), but occurs over an extra day, making for a total of 10 rainy days with increased humidity at 92%. For more detailed insights, check out Letchworth Garden City weather in November.
In September, the weather is generally mild, with temperatures ranging from a minimum of 3°C (37°F) to a comfortable maximum of 29°C (84°F). The average temperature settles around 15°C (59°F), with about 52 mm (2.0 in) of precipitation occurring over 9 days, and humidity levels at a relatively comfortable 82%. In contrast, December brings colder temperatures, with a minimum of -4°C (25°F) and a maximum of 15°C (58°F), averaging just 6°C (43°F). This month sees higher precipitation at 82 mm (3.2 in) spread across 15 days, alongside increased humidity levels at 92%. For more detailed weather insights about December, you can visit Letchworth Garden City weather in December.
September in Letchworth Garden City offers a remarkable transition from the warmth of summer to the cooler embrace of autumn. With an average temperature of 15°C, this month provides a delightful balance between the lingering heat that can occasionally peak at 29°C and the crispness of early fall, where nights can dip as low as 3°C. The increase in humidity at 82% adds a subtle depth to the air, making the landscape feel alive with promising autumn colors. Rainfall is relatively moderate, with 52 mm spread over nine days, nurturing the vibrant greenery as the days become shorter. This combination of warmth, subtle moisture, and transitioning landscapes makes September a unique time to experience the evolving Letchworth Garden City Climate. For more detailed insights, check out Letchworth Garden City Climate.