September Weather in Dover, United Kingdom

Last updated: March 17, 2025

September in Dover, United Kingdom, offers a pleasant transition from summer to autumn. The maximum temperature reaches a comfortable 25°C (77°F), while the average sits around 16°C (61°F), making it an ideal time for outdoor exploration. With minimum temperatures dipping to 6°C (44°F), visitors should be prepared for cooler evenings. This month experiences about 46 mm (1.8 in) of rain spread over 9 days, contributing to a relatively high humidity level of 80%. Overall, September in Dover balances warm days with the fresh crispness of fall, providing a picturesque backdrop for both locals and travelers.

September Temperature in Dover

As summer fades into autumn, September in Dover ushers in a pleasant transition characterized by mild temperatures. With minimums around 6°C (44°F) and average highs reaching 25°C (77°F), the month offers an inviting climate for outdoor activities. This temperature pattern marks a noticeable shift from the warmer summer months, creating a comfortable atmosphere for strolls along the coast or exploring the picturesque countryside. The average temperature of 16°C (61°F) reflects the lingering warmth of summer while hinting at the cooler days to come, making September a delightful time to experience all that Dover has to offer before the chill of autumn settles in.

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

The chart illustrates September temperature patterns in Dover, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424446495561646461554945
Data source: Temperature data for Dover 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 Dover

In September, Dover experiences a noticeable shift in precipitation as the summer months give way to autumn. With an average rainfall of 46 mm (1.8 in) over 9 days, this month is relatively moderate compared to the heavier downpours of October and December. The rainfall in September marks a slight decrease compared to the wetter summer, particularly August, which recorded 72 mm (2.8 in). This transition signifies the onset of longer, cooler nights and a gradual increase in precipitation leading into the wetter months ahead. The trend suggests that while September is often drier, the looming autumn brings with it a promise of more frequent rain, setting the stage for the annual shift in Dover's climatic patterns.

September Precipitation Trends in Dover

The chart displays monthly precipitation patterns in Dover, 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.
JanFebMarAprMayJunJulAugSepOctNovDec576051276055517246896096
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Dover

In September, humidity in Dover starts to climb back up after the summer months, settling at a comfortable 80%. This marks a transition from the drier conditions of August, when the levels dipped to 73%, reflecting the typical cooling of the climate as autumn approaches. The gradual increase in humidity is a precursor to the wetter months ahead, as the figures rise significantly in October and further into the winter months, peaking at 92% in both November and December. Overall, September acts as a gentle reminder of the humid conditions that characterize the latter part of the year, as the warm, sunny days give way to the cool, damp atmosphere of fall.

September Average Humidity in Dover

This chart illustrates the average monthly humidity levels in Dover, 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%82%81%76%73%80%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Dover

As the summer fades into autumn, September in Dover, United Kingdom, presents a transitional UV Index of 5, categorizing it as moderate risk for sun exposure. This marks a decline from the very high levels experienced in July and June, where UV Index values peaked at 8. With a burn time of 30 minutes, it's essential to remain mindful of sun safety, especially for those enjoying the lingering warm days of early fall. September's index reflects a gradual shift towards lower UV levels, aligning with the trend of reduced sun exposure as the season changes. For more detailed insights on local sun safety, visit Dover UV Index.

Maximum UV Index Levels in Dover for September

The chart shows the monthly maximum UV Index (UVI) for Dover 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Dover 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 Dover

September in Dover, United Kingdom, marks a delightful transition as the summer warmth lingers just a bit longer. With 326 hours of sunshine, this month still enjoys a fair share of bright days, although it sees a noticeable decrease from the peak summer months. After basking in an impressive 422 hours in July and 398 hours in August, the sun's presence begins to wane, showcasing a seasonal pattern where daylight starts to retreat into the cooler months ahead. As autumn approaches, the declining trend continues, with October bringing only 248 hours of sunlight. This gentle shift from the vibrant summer to the cozy embrace of fall creates a picturesque setting for those eager to savor the last golden rays of the year.

Monthly Sunshine Duration in Dover: September Highlighted

The September sunshine duration represents the total number of hours Dover 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.
JanFebMarAprMayJunJulAugSepOctNovDec95h157h234h351h414h416h422h398h326h248h163h117h
Data source: Dover September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Dover During September

In Dover, United Kingdom, September offers a consistent chance of sunny weather, with approximately 36% likelihood of sunshine, mirroring the sunny disposition seen in both August and May. As schools settle back into the rhythm of the academic year, this time of year retains some of the summer's warmth while gradually shifting towards autumn. A notable trend emerges from the seasonal data: the likelihood of sunny days in September aligns closely with the summer month's averages, suggesting that those hoping to bask in the sun should still seize the chance before the gray skies of October arrive, which sees a drop to 29%. Overall, while September won't guarantee endless sunshine, it presents a promising opportunity for outdoor enjoyment amid the change of seasons.

Percentage of Sunny Days in September in Dover

The chart illustrates the percentage of sunny days in Dover 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 Dover experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec18%27%35%49%37%31%41%36%36%29%29%19%
Data source: Dover September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Dover in September

As summer fades, September in Dover, United Kingdom, witnesses a gentle decline in daylight, offering approximately 12 hours of sunshine each day. This pattern reflects a gradual transition from the peak brightness of June and July, where the days basked in 16 hours of light. Following a vibrant August basking in 14 hours, September signals the start of autumn, with daylight hours shortening as the year approaches its end. As nature begins to prepare for winter, the diminishing light serves as a poignant reminder of the cyclical rhythms of the seasons, leading into the stark 10 hours of daylight by October and even shorter days in the ensuing months.

Average Daylight Hours in Dover for September

The chart illustrates the variation in daylight duration in Dover throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 26m9h 59m11h 55m13h 53m15h 35m16h 29m16h14h 28m12h 34m10h 37m8h 52m7h 56m
Data source: Dover daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Dover

September in Dover, United Kingdom, ushers in a gentle breeze with an average wind speed of 4.4 m/s (10 mph). This month typically heralds the transition from the warmer summer months, where wind speeds peaked at 5.1 m/s (11 mph) in August. As autumn approaches, the winds begin to calm, reflecting a notable dip compared to the brisk conditions earlier in the year, such as the robust 6.1 m/s (14 mph) experienced in February. While the winds may not whip through the streets as fiercely, the gentle gusts of September nonetheless carry the promise of changing seasons, inviting leisurely walks along the coastline and a hint of the crisp air to come.

Average September Wind Speed in Dover

The chart displays monthly wind speed patterns in Dover, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.56.15.44.95.23.84.55.14.4 m/s5.94.95.6
Data source: Dover September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Dover Compares to Other Months

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

September and January present distinctly different weather patterns. In September, temperatures fluctuate between a minimum of 6°C (44°F) and a maximum of 25°C (77°F), with an average of 16°C (61°F). The month sees around 46 mm (1.8 in) of precipitation over about 9 days and humidity at a moderate 80%. Conversely, January experiences much colder temperatures, ranging from -3°C (27°F) to a maximum of 13°C (56°F), with an average temperature of just 6°C (43°F). Precipitation increases to 57 mm (2.3 in) across approximately 11 days, accompanied by higher humidity at 91%. For a more detailed look at January weather, you can check Dover weather in January.

September and February present quite contrasting weather experiences. In September, temperatures range from a mild 6°C (44°F) to a pleasant high of 25°C (77°F), with an average of 16°C (61°F) and only 46 mm of precipitation over about 9 days. The humidity sits at a relatively comfortable 80%. In stark comparison, February is much colder, with minimum temperatures dipping to -4°C (26°F) and averaging around 7°C (44°F), peaking at just 15°C (59°F). The month also sees increased precipitation at 59 mm and rain on about 13 days, accompanied by higher humidity levels at 89%. For more detailed information, you can check Dover weather in February.

In September, the weather typically features a milder average temperature of 16°C (61°F), with maximums reaching up to 25°C (77°F). It experiences relatively lower precipitation at 46 mm (1.8 in) over about 9 days and a humidity level of 80%. Conversely, March brings cooler temperatures, with averages around 8°C (46°F) and maximums peaking at 19°C (66°F). It also sees slightly higher precipitation of 51 mm (2.0 in) over 12 days, accompanied by increased humidity at 86%. This comparison highlights the transition from the warmth of early autumn in September to the still-chilly, damp conditions of early spring in March. For more details, you can check out Dover weather in March.

In comparing the weather of September and April, we see distinct differences in temperature and precipitation. September typically enjoys a milder climate, with average temperatures ranging from a cool 16°C (61°F) to a warm 25°C (77°F), while April experiences cooler conditions, with an average of just 10°C (49°F) and a maximum of 21°C (70°F). Precipitation is more frequent in September, with 46 mm (1.8 in) falling over 9 days, compared to April's 27 mm (1.1 in) over 6 days. Additionally, the humidity levels are slightly higher in April at 85%, compared to 80% in September. For more detailed insights into April's weather, you can explore Dover weather in April.

September typically offers a milder climate compared to May, with average temperatures reaching 16°C (61°F) and highs of 25°C (77°F). In contrast, May has a cooler average temperature of 13°C (55°F) and peaks at 23°C (73°F). Although both months experience significant humidity, September's humidity is slightly lower at 80%, compared to May's 82%. Precipitation is also notable: September sees 46 mm (1.8 in) of rain over 9 days, while May has a higher amount, with 60 mm (2.4 in) falling on 11 days. For a detailed look, check out Dover weather in May.

In comparing the weather of September and June, we find that both months have a similar average temperature of 16°C (61°F); however, June tends to be slightly warmer with maximum temperatures reaching up to 28°C (83°F), compared to September's max of 25°C (77°F). Moreover, September experiences a lower minimum temperature of 6°C (44°F), while June starts off at 9°C (48°F). Precipitation levels are relatively close, with September receiving 46 mm (1.8 in) and June slightly higher at 55 mm (2.2 in), both spread across nine rainy days. Humidity remains comparable, with September at 80% and June at 81%. For more insights on conditions in June, visit Dover weather in June.

When comparing the weather in September and July, notable differences emerge. September boasts cooler temperatures, with a minimum of 6°C (44°F) and an average high of 25°C (77°F), while July is warmer, featuring a minimum of 11°C (52°F) and a peak of 33°C (92°F). Although July has slightly higher precipitation at 51 mm (2.0 in) over 11 days compared to September's 46 mm (1.8 in) over 9 days, September's humidity is a bit higher at 80%, compared to July's 76%. Thus, while July is characterized by its heat and summer-like conditions, September transitions toward the cooler, more humid days of autumn. For further details about July's weather, you can visit Dover weather in July.

In comparing the weather between September and August, September tends to be milder with a minimum temperature of 6°C (44°F) and an average of 16°C (61°F), while August experiences warmer conditions with a minimum of 11°C (51°F) and an average of 18°C (65°F). August also sees higher maximum temperatures, reaching 31°C (89°F) compared to September's 25°C (77°F). Additionally, September has slightly less precipitation at 46 mm (1.8 in) over 9 days, compared to August's 72 mm (2.8 in) over 11 days, although the humidity is higher in September at 80% compared to August's 73%. For more detailed insights, you can check Dover weather in August.

In comparing the weather between September and October, it is evident that October tends to be cooler and wetter. September brings milder temperatures with an average of 16°C (61°F) and maximums reaching 25°C (77°F), while October sees a drop in the average to 13°C (56°F) and maximums of 22°C (72°F). Additionally, October experiences a significant increase in precipitation, totaling 88 mm (3.5 in) over 13 days compared to September's 46 mm (1.8 in) over 9 days. Humidity also rises slightly in October to 89%, compared to 80% in September. For more details on October weather specifics, you can check this link: Dover weather in October.

September boasts a more temperate climate, with average temperatures reaching around 16°C (61°F) and highs of 25°C (77°F), while November sees a significant drop in temperatures, averaging only 9°C (49°F) and peaking at 17°C (63°F). Additionally, September experiences lighter precipitation at 46 mm (1.8 in) over 9 days, compared to November's increase to 60 mm (2.3 in) over 12 days. The humidity also rises in November to 92%, compared to September's 80%, contributing to a noticeably damp and cooler atmosphere. For more specific details on November weather, you can check Dover weather in November.

September and December exhibit notable differences in weather patterns. September enjoys milder temperatures with a minimum of 6°C (44°F) and an average of 16°C (61°F), peaking at a comfortable 25°C (77°F). In contrast, December sees much cooler conditions, with temperatures dropping drastically to a minimum of 0°C (33°F) and an average of just 7°C (45°F). While September experiences 46 mm (1.8 in) of precipitation over 9 days, December is significantly wetter, receiving 96 mm (3.8 in) across 14 days. Humidity also rises from 80% in September to a higher 92% in December, contributing to a distinct shift in the season. For more detailed information, you can check Dover weather in December.

Compare Dover's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Dover

As September arrives in Dover, the weather takes on a unique character that sets it apart from the preceding summer months. With temperatures cooling down yet still reaching a pleasant maximum of 25°C (77°F), the transition to autumn is palpable, offering a comfortable average of 16°C (61°F). While this month is marked by a noticeable increase in precipitation days, averaging 9 days of rain, the overall humidity remains elevated at 80%, adding a distinct chill in the air during the evenings. This blend of mild temperatures coupled with occasional wet weather makes September a special time to experience the coastal beauty of Dover. For a deeper dive into the weather patterns and trends, visit Dover Climate.