Last updated: March 17, 2025
In September, Derry, United Kingdom experiences a blend of moderate temperatures and notable precipitation. Daily highs can reach a pleasant 24°C (75°F), while the average settles around a comfortable 13°C (55°F). However, nights can dip to a cool 2°C (36°F). With 85 mm (3.4 in) of rainfall spread over approximately 17 days, the month is characterized by its noteworthy humidity of 88%, creating a lush atmosphere. Despite the showers, September offers a unique opportunity to appreciate Derry's vibrant landscape, inviting both locals and visitors to embrace its natural beauty.
As September unfolds in Derry, temperatures begin to show the subtle shift towards autumn, with minimums averaging around 2°C (36°F) and highs reaching a pleasant 24°C (75°F). This month marks a transition from the summer warmth of August, as the average temperature stabilizes at 13°C (55°F). The days are still relatively mild, allowing for enjoyable outdoor activities, but the crispness in the air serves as a reminder of the changing seasons ahead. With a notable drop in temperature compared to the summer months, September offers a comforting blend of warmth and coolness, inviting residents and visitors alike to savor the vibrant colors of fall as they emerge.
In September, Derry experiences a notable transition in weather, with precipitation measuring 85 mm (3.4 in) over 17 days. This month continues the trend of relatively high rainfall observed during the summer, which peaks in August with 134 mm (5.3 in), but it tapers off slightly as autumn approaches. September's rainfall is substantial yet not extreme, standing out amidst the more pronounced precipitation of the preceding months. The consistent number of rainy days underscores Derry's reputation for its damp climate, bridging the gap between summer's lushness and the crispness of upcoming autumn. As the leaves begin to change, residents can expect a mix of showers, contributing to the evergreen charm of this vibrant city.
As summer transitions into autumn, September in Derry reveals a notable uptick in humidity, reaching 88%—the highest of the year thus far. This rise marks a significant shift from the preceding months, where humidity fluctuated between 82% and 86%. The trend suggests that as the days grow shorter and cooler, the atmosphere retains more moisture, paving the way for a damp start to fall. Following September, humidity continues to climb, peaking in October at 89% and remaining high through the winter months. This pattern illustrates how Derry’s weather evolves with the seasons, inviting residents to embrace the cozy indoors as the humidity wraps around the city like a soft blanket.
As September unfolds in Derry, the UV Index settles at a moderate level of 5, indicative of the changing seasons. After the peak summer months, where UV Index levels soared to a very high 8 in both June and July, a slight decrease is felt in the early autumn. While exposure time increases back to 30 minutes before a burn is likely, it’s still essential to take precautions. This month’s reading aligns with the trends seen in April, indicating that the sun's intensity is less severe than in the summer but still warrants attention. Whether you're enjoying outdoor activities or preparing for a walk, understanding the moderate exposure category is crucial. Stay informed about the UV trends to protect your skin. For more details, check out the Derry UV Index.
UV Risk Categories
September in Derry, United Kingdom, welcomes a delightful blend of summer's farewell and autumn's embrace, with 277 hours of sunshine gracing the skies. As daylight begins to wane from the vibrant summer months, which boasted over 390 hours in both July and August, September still holds on to a generous amount of sunlight, marking it as a pivotal transition month. This gradual decrease continues into October, where the hours dip to 221. However, the lingering warmth of September makes it a cherished time to enjoy the outdoors before the darker months of the year set in. The consistent upward trend from January's mere 71 hours to the sun-soaked 400 hours in May showcases Derry's seasonal shift, creating a captivating tableau of changing light that invites residents and visitors alike to relish in the lingering days of sunshine.
In September, Derry, United Kingdom, experiences a modest likelihood of sunny weather, with only a 17% chance of sunshine. This statistic marks a slight decline compared to the warmer spring months, such as April, which boasts a more favorable 37% chance. Following the peak of summer, Derry's weather tends to shift towards overcast days, as observed in August and July, where sunny conditions dwindle to 16% and 21% respectively. As autumn approaches, the chances of seeking sunshine in September remain relatively low, reflecting a broader trend of decreasing sunny days as the year progresses.
As September rolls in Derry, the days begin to shorten, offering a gentle transition from the long, sun-drenched summer months. With an average daylight duration of 12 hours, the city experiences a subtle shift from the 16 hours of sunlight enjoyed in June, towards the cozy, candlelit evenings of autumn. This month showcases a delightful balance, where lush greenery still flourishes under daylight, yet a hint of the approaching chill is palpable. As daylight dims, Derry’s inhabitants embrace the changing season, preparing for the crisp days ahead, while savoring the last vestiges of summer’s warmth.
As summer gives way to autumn, September in Derry, United Kingdom marks a subtle shift in wind patterns. With an average wind speed of 3.4 m/s (8 mph), September experiences a gentle breeze, slightly stronger than the summer months of July and August, where winds were notably calm at 2.4 m/s (5 mph) and 2.9 m/s (7 mph), respectively. This moderate gustiness hints at the seasonal transition, signaling the approach of the more brisk and brisk October winds, which average 4.5 m/s (10 mph). Overall, September acts as a bridge, bringing a whisper of autumn’s arrival while still holding onto the remnants of summer’s tranquility.
The weather in Derry 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 Derry and find detailed weather information for every month.
In comparing the weather in September and January, September tends to be milder, featuring an average temperature of 13°C (55°F) with maximums reaching 24°C (75°F). This month also experiences significant precipitation, with 85 mm (3.4 inches) falling over approximately 17 days and humidity levels averaging around 88%. In contrast, January is much colder, with average temperatures hovering around 6°C (42°F) and highs of only 14°C (57°F). Precipitation is less frequent, totaling 69 mm (2.7 inches) across 12 days, while humidity remains slightly lower at 87%. For more detailed information on January weather, you can refer to Derry weather in January.
When comparing the weather in September and February, September tends to be milder with average temperatures ranging from 2°C to 24°C (36°F to 75°F), while February experiences colder conditions with temperatures spanning from -3°C to 14°C (27°F to 58°F). Precipitation in February is slightly higher at 106 mm (4.2 in) over 16 days compared to September’s 85 mm (3.4 in) over 17 days, indicating a wetter month. Additionally, humidity levels are relatively similar, with September at 88% and February at 86%, suggesting a consistent dampness throughout the months. For more specifics about February weather, you can check Derry weather in February.
In comparing September and March weather, September tends to be milder with average temperatures ranging from 2°C (36°F) to 24°C (75°F), while March presents cooler conditions, with temperatures varying from -4°C (25°F) to 17°C (62°F). Both months experience a similar number of rainy days, with September recording 85 mm (3.4 in) of precipitation and March slightly higher at 95 mm (3.7 in). Humidity levels are relatively close as well, with September at 88% and March at 86%. For more details on March weather, you can visit Derry weather in March.
September and April present distinct weather patterns as the seasons transition. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 24°C (75°F), with an average of 13°C (55°F). The month also sees significant rainfall, with 85 mm (3.4 in) of precipitation occurring over 17 days and humidity levels reaching 88%. In contrast, April experiences cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 21°C (69°F), averaging around 8°C (47°F). Precipitation is lower in April, totaling 58 mm (2.3 in) over 13 days, and humidity is slightly less at 85%. For more detailed information, you can check Derry weather in April.
In comparing the weather of September and May, September tends to be slightly warmer, with average temperatures ranging from 2°C to 24°C (36°F to 75°F), while May features a more variable range, with minimum temperatures dipping down to -1°C (31°F) and maximums reaching up to 25°C (76°F). Precipitation levels are fairly comparable, with September experiencing 85 mm (3.4 in) over 17 days and May recording 81 mm (3.2 in) across 15 days. Additionally, September has a higher humidity level at 88%, compared to May's 82%. For more detailed information on May weather, you can check Derry weather in May.
In comparing the weather of September and June, we note that both months share a similar average temperature of around 13°C (55°F). However, June tends to be slightly warmer, with maximum temperatures reaching up to 27°C (81°F) compared to September's maximum of 24°C (75°F). Precipitation levels are also close, with June receiving 95 mm (3.7 in) of rain over 17 days, just slightly above September's 85 mm (3.4 in) across the same number of days. Additionally, humidity in September is marginally higher at 88% compared to June's 84%. For more details, you can check Derry weather in June.
When comparing the weather in September to that of July, notable differences emerge. September experiences cooler temperatures, with a minimum of 2°C (36°F) and an average of 13°C (55°F), whereas July starts off warmer, with a minimum of 7°C (45°F) and an average of 15°C (59°F). The maximum temperature in July reaches up to 27°C (81°F), making it the warmer month compared to September's maximum of 24°C (75°F). Both months see similar levels of precipitation, with September recording 85 mm (3.4 in) over 17 days and July slightly higher at 91 mm (3.6 in) over 15 days. Humidity levels are relatively comparable too, with September at 88% and July at 86%. For more detailed insights about July weather, you can refer to Derry weather in July.
In comparing the weather of September and August, September tends to be slightly cooler, with minimum temperatures dropping to 2°C (36°F) compared to August's minimum of 6°C (44°F). The average temperature for September is 13°C (55°F), while August has a slightly warmer average of 15°C (58°F). Although September experiences less overall precipitation at 85 mm (3.4 in) and fewer rainy days (17 days) than August, which has 134 mm (5.3 in) over 20 days, the humidity remains relatively high in both months, with September at 88% and August at 86%. For more detailed insights into August weather, visit Derry weather in August.
In comparing the weather between September and October, we see a noticeable drop in temperatures. September boasts a minimum temperature of 2°C (36°F) and an average of 13°C (55°F), peaking at 24°C (75°F). In contrast, October starts a degree cooler, with a minimum of 1°C (33°F) and an average of 10°C (51°F), reaching a maximum of 19°C (66°F). Precipitation increases slightly from 85 mm (3.4 in) over 17 days in September to 102 mm (4.0 in) across 18 days in October, accompanied by a slight rise in humidity. For more specific insights on October weather, you can check Derry weather in October.
In September, the weather tends to be milder, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 24°C (75°F) and an average of 13°C (55°F). However, as the season transitions into November, temperatures drop significantly, with lows reaching -2°C (29°F) and averages around 8°C (46°F), peaking at 15°C (59°F). Both months experience considerable rainfall, with September receiving 85 mm (3.4 in) over 17 days and November slightly wetter at 94 mm (3.7 in) across 18 days. Humidity remains high in both months, increasing from 88% in September to 90% in November. For a more detailed look at November's weather, you can check Derry weather in November.
September and December present stark contrasts in weather. September typically enjoys milder temperatures, with minimums around 2°C (36°F) and maximums reaching up to 24°C (75°F), while December experiences chillier conditions, with lows of -3°C (27°F) and highs peaking at just 13°C (56°F). Additionally, September sees an average precipitation of 85 mm (3.4 in) over 17 days, whereas December has a slightly higher precipitation of 101 mm (4.0 in) spread over 19 days. Humidity levels remain quite similar, at 88% in September compared to 86% in December. For more detailed information about December weather, check out Derry weather in December.
As September rolls in, Derry experiences a noticeable shift in weather, transitioning from the warmth of summer to a more temperate climate. While the days can still reach a pleasant 24°C, the evenings cool down significantly, dipping to around 2°C. This month is characterized by a higher humidity level and increased rainfall, with nearly two-thirds of September experiencing some form of precipitation. The abundance of 85 mm of rain over 17 days often creates that familiar lushness in the city's scenic landscapes. For those keen on exploring what each season brings, September’s unique blend of warm days and cool nights provides a charming contrast to the milder climates of other months. To delve deeper into the patterns and nuances of Derry's weather throughout the year, explore Derry Climate.