September Weather in Douglas, Isle of Man

Last updated: August 21, 2025

In September, Douglas, Isle of Man, experiences a mild maritime climate characterized by a maximum temperature of 19°C (67°F) and an average of 14°C (58°F), dipping to a minimum of 10°C (51°F). This month is marked by high humidity levels at 88%, creating a moist atmosphere. Rainfall is notable, with 101 mm (4.0 in) of precipitation across approximately 15 days, offering a blend of drizzly days and occasional sunny spells. Visitors should prepare for variable weather while enjoying the island's lush landscapes and coastal charm.

September Temperature in Douglas

In September, Douglas, Isle of Man, experiences a gentle transition into autumn, with temperatures exhibiting a comforting range. The month starts with a minimum of 10°C (51°F) and peaks at around 19°C (67°F), showcasing a pleasant average of 14°C (58°F). This moderate climate reflects a subtle shift from the warmth of summer, where average temperatures reached their highest in August. The coolness of the evenings and mild days create an inviting atmosphere, making September an ideal time for outdoor activities while also hinting at the impending chill of autumn. Overall, it's a month that balances warmth and coolness, aligning perfectly with the beauty of nature's changing palette.

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

The chart illustrates September temperature patterns in Douglas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Douglas, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec454545465055585958545047
Data source: Temperature data for Douglas generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Douglas

In September, Douglas, Isle of Man experienced a significant precipitation total of 101 mm (4.0 in), matching the previous month's rainfall. This month also marked a notable shift in the weather pattern, with rain falling on 15 days, indicating a transition into the wetter autumn season. As the year progresses, precipitation tends to increase; the rainfall in September sets the stage for a notably wetter October, which averages 145 mm (5.7 in). This consistency in rain suggests that while late summer may still offer some sun, autumn is poised to bring more frequent showers, shaping the landscape and atmosphere of the island as it heads further into the fall months.

September Precipitation Trends in Douglas

The chart displays monthly precipitation patterns in Douglas, 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. In Douglas, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec821119137497482101101145141141
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Douglas

September in Douglas, Isle of Man sees humidity climbing back to 88%, a notable resurgence as summer wanes. This month marks a turning point, as humidity levels begin to mimic the higher averages observed at the year's onset, with January's 90% and October's 90% just around the corner. While the summer months of July and August hold steady at 82%, the arrival of September suggests an impending return to the island's characteristic moisture. This upward trend not only adds a hint of freshness to the air but also foreshadows the dampness typical of the autumn months ahead.

September Average Humidity in Douglas

This chart illustrates the average monthly humidity levels in Douglas, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Douglas is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Douglas

As summer fades, the UV Index in September for Douglas, Isle of Man, reflects a shift towards milder conditions, registering at 5, which falls into the moderate exposure category. This decrease from August's high index of 6 indicates a slight easing of sun intensity, yet caution is still advised. With a burn time of around 30 minutes, it's still essential to stay sun-smart. Observing this trend, the UV Index typically begins to taper off as autumn approaches, reminding us of the importance of protective measures against UV radiation, even in early fall. For more detailed information, visit Douglas UV Index.

Maximum UV Index Levels in Douglas for September

The chart shows the monthly maximum UV Index (UVI) for Douglas 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. In September, the maximum UV index in Douglas typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
Data source: Douglas 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 Douglas

As summer gives way to autumn, September in Douglas, Isle of Man, offers a delightful mix of fading warmth and bright sunshine, boasting 309 hours of sun—a significant dip from the sun-drenched peaks of the early summer months. After basking in a glorious 418 hours of sunlight in May and 416 hours in July, the transition becomes evident, yet September holds its charm with more sunshine than the gloomy days of winter ahead. As daylight gradually wanes and the clock ticks down towards October's 239 hours, September serves as a gentle reminder of the lingering summer days, setting the stage for the cozy introspection that autumn brings. The rhythm of the seasons is palpable here, with September acting as a bridge between the exuberance of summer and the quietude of fall, inviting locals and visitors alike to savor the sunlight while it lasts.

Monthly Sunshine Duration in Douglas: September Highlighted

The September sunshine duration represents the total number of hours Douglas 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.
JanFebMarAprMayJunJulAugSepOctNovDec86h157h227h344h418h407h416h371h309h239h123h97h
Data source: Douglas September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Douglas During September

As the summer warms the skies over Douglas, September typically marks a transition towards more subdued weather patterns, evidenced by a 24% chance of sunny days. This figure represents a noticeable dip from the sunnier months of April and May, which enjoy probabilities of 53% and 39%, respectively. While the sunshine tends to wane as autumn approaches, September still holds a glimmer of warm days amidst the shifting season. This month stands as a delightful farewell to summer, yet volatility in weather can lead to unexpected bursts of sun, making it a wildcard for outdoor enthusiasts. As autumn looms, it’s wise to embrace the seasons' unpredictable charm!

Percentage of Sunny Days in September in Douglas

The chart illustrates the percentage of sunny days in Douglas 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 Douglas experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec31%28%25%53%39%29%41%30%24%22%25%20%
Data source: Douglas September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Douglas in September

As summer gracefully transitions into autumn, September in Douglas, Isle of Man, experiences a notable shift in daylight duration, with 12 hours of daylight illuminating the days. This marks a gradual decline from the sun-drenched heights of June, where residents enjoyed a remarkable 17 hours of sunlight. The trend continues from the vibrant 16 hours of July and the softer 14 hours in August, signaling the onset of shorter days as the year progresses. With each month, the amount of daylight diminishes, leading into October's 10 hours and November's 8 hours. This rhythmic ebb and flow of sunlight not only marks seasonal change but also encourages the community to savor every precious evening in the warmth of the waning daylight.

Average Daylight Hours in Douglas for September

The chart illustrates the variation in daylight duration in Douglas throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 58m9h 44m11h 54m14h 6m16h 3m17h 6m16h 32m14h 46m12h 38m10h 27m8h 28m7h 23m
Data source: Douglas daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Douglas

As summer fades into fall, September in Douglas, Isle of Man brings a gentle breeze with an average wind speed of 6.1 m/s (14 mph). This marks a subtle increase from the calm July and August months, reflecting a shift in seasonal dynamics. After enjoying the relative stillness of summer, locals and visitors alike begin to feel the transition, as winds pick up slightly, foreshadowing the stronger gusts of autumn. Notably, as we move deeper into the year, wind speeds begin to rise again, reaching averages of 9.6 m/s (21 mph) in October and holding steady through the end of the year. This trend underscores the Isle's resilient maritime character, where each season brings its unique atmospheric charm.

Average September Wind Speed in Douglas

The chart displays monthly wind speed patterns in Douglas, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8.310.88.65.76.66.44.55.86.1 m/s9.69.49.2
Data source: Douglas September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Douglas Compares to Other Months

Weather in Douglas varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Douglas, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present contrasting weather conditions, with September enjoying milder temperatures than January. In September, average temperatures range from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), while January experiences cooler averages, peaking at just 13°C (55°F) and dipping to a minimum of 3°C (37°F). Additionally, while September sees higher precipitation at 101 mm (4.0 in) over 15 days, January has slightly less with 82 mm (3.2 in) over 13 days. Humidity remains high in both months, with September at 88% and January slightly higher at 90%. For a more detailed look at January weather, visit Douglas weather in January.

September and February exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), with an average of 14°C (58°F), making it a milder month overall. Precipitation is significant at 101 mm (4.0 in) over approximately 15 rainy days, while the humidity remains high at 88%. In contrast, February is much colder, with temperatures falling between 1°C (34°F) and 12°C (54°F), averaging 7°C (45°F). This month experiences slightly higher precipitation at 111 mm (4.4 in) over 18 days, yet the humidity level remains consistent at 88%. For more details, you can check Douglas weather in February.

In comparing the weather of September and March, one can observe notable differences in temperature and precipitation patterns. September enjoys a milder climate, with average temperatures ranging from 10°C (51°F) to a maximum of 19°C (67°F), while March is noticeably cooler, with average temperatures between -1°C (30°F) and a maximum of 11°C (52°F). Precipitation is somewhat similar, with September receiving 101 mm (4.0 in) over approximately 15 days and March experiencing slightly less at 91 mm (3.6 in) over 17 days. Humidity remains high in both months, at 88% in September and 86% in March, contributing to a damp atmosphere typical of this time of year. For a detailed look at the March weather in Douglas, you can visit Douglas weather in March.

When comparing the weather in September and April, we see significant differences in temperature and precipitation. In September, temperatures range from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), with an average of 14°C (58°F). This month also experiences more rainfall, with 101 mm (4.0 in) over 15 days, and humidity levels are quite high at 88%. In contrast, April's temperatures are cooler, starting at a minimum of 3°C (38°F) and peaking at 13°C (56°F), averaging just 8°C (47°F). April is drier, with only 37 mm (1.5 in) of precipitation spread over 7 days, and humidity slightly lower at 85%. For a more detailed look at April weather conditions, you can check Douglas weather in April.

In comparing the weather between September and May, September tends to be milder with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), compared to May's cooler range of 5°C (42°F) to 16°C (62°F). September also experiences higher precipitation, averaging 101 mm (4.0 in) over 15 rainy days, while May sees significantly less rain at 49 mm (1.9 in) across 10 days. Humidity levels in September are slightly higher at 88%, compared to 80% in May, contributing to a more humid feel. For further details, you can visit Douglas weather in May.

When comparing the weather in September and June, we notice some intriguing differences. September tends to be slightly warmer, with average temperatures reaching 14°C (58°F) compared to June's 13°C (55°F). However, the maximum temperature is a bit higher in September at 19°C (67°F), while June peaks at 18°C (65°F). September also sees more precipitation, totaling 101 mm (4.0 in) over 15 days, compared to June's 74 mm (2.9 in) over 11 days. Furthermore, September has a higher humidity level at 88%, compared to June's 83%. For more detailed information on June weather, you can visit Douglas weather in June.

September and July exhibit similar average temperatures, with both months ranging from a minimum of 10-11°C (51-53°F) and a maximum of around 19°C (67°F). However, September tends to be wetter, receiving 101 mm (4.0 in) of precipitation over 15 days compared to July's 82 mm (3.2 in) across 13 days. Humidity is also slightly higher in September at 88%, compared to 82% in July. For more details on July's weather, you can visit Douglas weather in July.

In comparing the weather of September and August, September tends to be slightly cooler, with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), while August typically sees temperatures between 12°C (54°F) and 18°C (65°F). Both months experience similar precipitation levels, with September receiving 101 mm (4.0 in) over 15 days and August also recording 101 mm (4.0 in) but spread over 17 days. Notably, September has a higher humidity level at 88%, compared to August's 82%. For a detailed look at August weather patterns, you can visit Douglas weather in August.

September's weather is generally milder, with average temperatures ranging from a minimum of 10°C (51°F) to a maximum of 19°C (67°F). The month experiences frequent rainfall, totaling 101 mm (4.0 in) over 15 days, and a relatively high humidity level of 88%. In contrast, October sees a drop in temperatures, with averages showing a minimum of 7°C (44°F) and a maximum of 17°C (63°F). Precipitation increases to 145 mm (5.7 in) over 19 days, and humidity rises slightly to 90%. The transition from September to October marks a shift towards cooler, wetter conditions. For more detailed information on weather patterns in October, check out Douglas weather in October.

In September, temperatures range from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), with an average of 14°C (58°F). The month experiences 101 mm (4.0 in) of precipitation over about 15 days, all while maintaining a relative humidity of 88%. By contrast, November brings cooler weather with temperatures dipping to a minimum of 5°C (42°F) and a maximum of 14°C (58°F), averaging just 10°C (50°F). This month tends to be wetter, with 141 mm (5.6 in) of rain spread over 20 days, accompanied by slightly higher humidity at 92%. For a closer look at November weather specifics, check Douglas weather in November.

In September, temperatures are generally milder, ranging from a minimum of 10°C (51°F) to a maximum of 19°C (67°F), with an average of 14°C (58°F). The month experiences approximately 101 mm (4.0 in) of precipitation over about 15 days, and humidity levels are relatively high at 88%. In contrast, December brings cooler weather, with temperatures dropping to a minimum of 3°C (38°F) and peaking at 13°C (55°F), averaging 8°C (47°F). Rainfall increases to 141 mm (5.6 in) spread over 22 days, and humidity rises slightly to 89%. For more detailed information, you can check Douglas weather in December.

Compare Douglas's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Douglas

As summer transitions into autumn, September in Douglas experiences cooler temperatures, with an average that dips compared to the warmer months. The month is characterized by increased humidity and a substantial amount of precipitation, making it one of the wetter times of the year. The frequent rainy days contribute to a vibrant landscape, but they also signal a shift from the drier, sunnier weather of summer. While temperatures may still reach pleasant highs during the day, the overall atmosphere becomes more brisk and refreshing. This distinctive weather pattern sets September apart, inviting both locals and visitors to embrace the beauty of an emerging autumn. For more details on the annual climate trends, visit Douglas Climate.