September Weather in Lyme Regis, United Kingdom

Last updated: March 17, 2025

In September, Lyme Regis, United Kingdom, experiences a delightful blend of warmth and coolness, with maximum temperatures reaching up to 28°C (82°F) and an average of 15°C (60°F). While the month can grow chilly, with minimum temperatures dipping to 4°C (39°F), it remains a vibrant time for visitors. Humidity is notably high at 79%, contributing to a refreshing coastal atmosphere. However, be prepared for a touch of rain, as 44 mm (1.7 in) of precipitation falls over approximately 8 days during the month, making it an ideal time to enjoy both the sun and occasional showers on beautiful beach strolls.

September Temperature in Lyme Regis

In September, Lyme Regis experiences a delightful transition as summer eases into autumn. Temperatures begin to cool slightly, with minimums around 4°C (39°F) and an average of 15°C (60°F), providing a comfortable climate for outdoor activities. The day peaks at a pleasant 28°C (82°F), offering plenty of opportunities to soak up the last rays of summer sun along the picturesque coastline. This month stands out as a perfect blend of warmth and crispness, making it ideal for coastal walks and exploring the town's charm before the chill of autumn sets in. Overall, September's temperatures reflect a gradual yet inviting shift, enticing visitors to enjoy Lyme Regis's natural beauty.

September Weather in Lyme Regis: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lyme Regis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec434446505561646359544846
Data source: Temperature data for Lyme Regis 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 Lyme Regis

In September, Lyme Regis experiences a modest precipitation total of 44 mm (1.7 in), marking a slight dip as summer transitions into autumn. With only 8 days of rainfall, this month often provides a reprieve from the wetter conditions seen earlier in the year, especially compared to the average highs of July and August. Notably, September's precipitation is lower than the heavier downpours of October, which typically sees a surge up to 98 mm (3.9 in), hinting at the shift towards the wetter months ahead. As the days grow shorter and the weather cools, residents and visitors alike can enjoy the crisp, fresh air, often punctuated by the occasional light shower—perfect for those scenic coastal walks.

September Precipitation Trends in Lyme Regis

The chart displays monthly precipitation patterns in Lyme Regis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec466071476770546844985888
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lyme Regis

In Lyme Regis, September marks a transition as humidity levels settle at a moderate 79%. Following the summertime dip, where July and August enjoyed relatively lower humidity at 70% and 73%, September ushers in a slight increase, hinting at the onset of the damp autumn months ahead. This trend of rising humidity continues into October, where it climbs to 89%, reflecting the region's characteristic shift from the warmth of summer to the crispness of fall. As the year progresses, the humidity peaks once again in the colder months of November and December, showcasing the high moisture content that defines this charming coastal town's climate.

September Average Humidity in Lyme Regis

This chart illustrates the average monthly humidity levels in Lyme Regis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%84%80%80%70%73%79%89%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lyme Regis

In September, Lyme Regis experiences a UV Index of 6, categorizing it as a high exposure month, with a burn time of 25 minutes. This marks a slight decline from the height of summer, where the UV Index peaked at 8 in both June and July, indicating a transition towards milder sun intensity as autumn approaches. While sun exposure remains significant, it’s essential to stay vigilant, especially during midday hours. This trend reflects a gradual reduction of UV strength from the summer months, providing a reminder to enjoy the outdoors responsibly as we embrace the changing seasons. For more details on sun safety throughout the year, visit Lyme Regis UV Index.

Maximum UV Index Levels in Lyme Regis for September

The chart shows the monthly maximum UV Index (UVI) for Lyme Regis 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.
JanFebMarAprMayJunJulAugSepOctNovDec224678876421
Data source: Lyme Regis 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 Lyme Regis

As summer begins to wane, September in Lyme Regis continues to bask in a generous 313 hours of sunshine, offering a lovely transition into the cooler months. This decline from the peak 418 hours in July highlights a gradual shift away from the sun-soaked days of summer, yet still provides ample light for exploring the stunning coastal scenery. Though the early autumn days are shorter, the vibrant sunsets and lingering warmth make September a delightful time to enjoy the town's charm, blending the tail end of summer's glow with the freshness of autumn. Travelers can delight in the crisp air and colorful landscapes without the bustling crowds of peak season, making it an ideal month to soak in the beauty of Lyme Regis.

Monthly Sunshine Duration in Lyme Regis: September Highlighted

The September sunshine duration represents the total number of hours Lyme Regis 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.
JanFebMarAprMayJunJulAugSepOctNovDec94h148h211h335h399h384h418h376h313h246h139h109h
Data source: Lyme Regis September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Lyme Regis During September

In Lyme Regis, September offers a moderate 31% chance of sunny weather, marking a slight uptick from the summer months, where July and August averaged lower at 38% and 28%, respectively. As the year transitions into autumn, the likelihood of sunny days experiences a subtle dip compared to the spring's peak sunshine probability of 52% in April. Despite this decline, September still boasts a relatively bright disposition, sandwiched between the sunnier months of earlier in the year and the cloudier predictions of October with a 25% chance. This makes the early fall an ideal time for both locals and visitors to enjoy the coastal charm of Lyme Regis before the chill sets in.

Percentage of Sunny Days in September in Lyme Regis

The chart illustrates the percentage of sunny days in Lyme Regis 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 Lyme Regis experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%25%34%52%35%27%38%28%31%25%32%21%
Data source: Lyme Regis September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Lyme Regis in September

As summer fades in Lyme Regis, September welcomes a gentle transition with an average of 12 hours of daylight. This month marks a shift from the long, sun-soaked days of July and August, when the sunshine peaked at 15 and 14 hours, respectively. While September offers a slight decline, it still boasts significantly more daylight than the winter months ahead, with January and December languishing at just 8 hours. The gradual shortening of days reflects the rhythmic ebb and flow of seasons, inviting residents and visitors alike to savor the lingering warmth of early autumn while preparing for the cozy, dimmer days of winter.

Average Daylight Hours in Lyme Regis for September

The chart illustrates the variation in daylight duration in Lyme Regis throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 29m10h 1m11h 55m13h 51m15h 32m16h 25m15h 57m14h 26m12h 34m10h 38m8h 55m8h
Data source: Lyme Regis daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Lyme Regis

As summer transitions to autumn in Lyme Regis, September brings a gentle breeze with an average wind speed of 3.6 m/s (8 mph). This marks a slight decrease from the more blustery summer months, reflecting a calming in Nature’s rhythm. Following the peak summer winds in June and July, which hovered around 3.3 m/s and 3.7 m/s respectively, September’s winds are reminiscent of the mild air of early spring. This shift towards more tranquil conditions invites locals and visitors alike to enjoy leisurely strolls along the scenic coast, even as the cooler autumn air begins to settle in. As the months progress towards winter, where winds often pick up again, September serves as a gentle reminder of nature’s cyclical dance.

Average September Wind Speed in Lyme Regis

The chart displays monthly wind speed patterns in Lyme Regis, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.95.84.73.54.83.33.74.03.6 m/s4.73.95.0
Data source: Lyme Regis September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Lyme Regis Compares to Other Months

The weather in Lyme Regis 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 Lyme Regis and find detailed weather information for every month.

September weather features a mild range of temperatures, with minimums around 4°C (39°F) and maximums reaching up to 28°C (82°F), creating an average of 15°C (60°F). It experiences relatively low precipitation of 44 mm (1.7 in) over about 8 days, with humidity levels at 79%. In contrast, January brings much colder temperatures, dipping to a minimum of -3°C (26°F) and peaking at just 14°C (57°F) for an average of 6°C (43°F). This month sees slightly higher precipitation at 46 mm (1.8 in) over 9 days and increased humidity at 88%. For more specific insights into January conditions, you can check Lyme Regis weather in January.

September presents a much warmer climate compared to February, with temperatures ranging from a cool 4°C (39°F) to a pleasant maximum of 28°C (82°F), while February sees much colder conditions with a minimum of -5°C (24°F) and a maximum of 15°C (60°F). September is characterized by lower humidity at 79% and less frequent precipitation, averaging around 44 mm (1.7 in) over 8 days. In contrast, February experiences higher humidity at 88% and more precipitation, accumulating about 60 mm (2.4 in) over 10 days. For more details on the weather specifics during this time, you can check Lyme Regis weather in February.

The weather in September features a more moderate temperature range, with minimums around 4°C (39°F) and maximums reaching up to 28°C (82°F), while the average temperature sits at a comfortable 15°C (60°F). In contrast, March tends to be cooler, with minimum temperatures dropping to -5°C (23°F) and average highs of only 19°C (67°F), leading to an average temperature of 8°C (46°F). Additionally, March experiences more precipitation, totaling 71 mm (2.8 in) over 14 days, compared to September's 44 mm (1.7 in) over just 8 days. The humidity is also slightly higher in March at 86%, compared to September's 79%. For more detailed insights into March weather patterns, you can visit Lyme Regis weather in March.

September and April present distinctive weather patterns, reflecting the transition from summer to autumn and from winter to spring, respectively. In September, temperatures range from a low of 4°C (39°F) to a high of 28°C (82°F), with an average of 15°C (60°F) and a relative humidity of 79%. This month typically experiences less precipitation, averaging 44 mm (1.7 in) over about 8 days. In contrast, April sees a cooler temperature range, with minimums dropping to -2°C (29°F) and maximums reaching 22°C (73°F), averaging around 10°C (50°F). While April is slightly wetter, with precipitation totaling 47 mm (1.9 in) over the same number of days, it has a slightly higher humidity level of 84%. For a deeper look at April weather specifics, visit Lyme Regis weather in April.

When comparing the weather in September and May, several differences emerge. September tends to have a broader temperature range, with minimums of 4°C (39°F) and maximums reaching 28°C (82°F), averaging around 15°C (60°F). In contrast, May is cooler overall, featuring minimum temperatures of 1°C (35°F) and maximums of 24°C (76°F), with an average of 13°C (55°F). Precipitation in September is moderate at 44 mm (1.7 in) over 8 days, while May experiences a slightly higher rainfall of 67 mm (2.6 in) across 12 days. Humidity levels are similar, with September at 79% and May at 80%. For a more detailed look at May weather in Lyme Regis, visit Lyme Regis weather in May.

When comparing September and June weather, September generally sees milder temperatures, with a minimum of 4°C (39°F) and a maximum of 28°C (82°F), resulting in an average of 15°C (60°F). In contrast, June offers slightly warmer temperatures, ranging from a minimum of 7°C (45°F) to a maximum of 30°C (86°F) and an average of 16°C (61°F). Additionally, September has less precipitation at 44 mm (1.7 in) over 8 days, compared to June’s 70 mm (2.7 in) over 10 days. Humidity levels are similar, with September at 79% and June at 80%. For a detailed look at June's climate, you can check Lyme Regis weather in June.

In comparing the weather of September and July, we notice that September experiences a broader temperature range, with minimums dropping to 4°C (39°F) and maximums reaching 28°C (82°F), while July boasts milder temperatures, with minimums of 9°C (49°F) and maximums of 30°C (86°F). The average temperature in September is 15°C (60°F), slightly cooler than July’s average of 18°C (65°F). Additionally, September sees less precipitation overall at 44 mm (1.7 in), compared to July's 54 mm (2.1 in), but it has a similar number of wet days—8 days in September versus 10 in July. The humidity remains relatively high in both months, with September at 79% and July at a slightly lower 70%. For a more detailed look at July's weather specifics, you can visit Lyme Regis weather in July.

In comparing the weather of September and August, September tends to be cooler with a minimum temperature dropping to 4°C (39°F) compared to August's 8°C (47°F). While both months see mild average temperatures, August has a slightly higher average of 17°C (63°F) versus September's 15°C (60°F). Additionally, August experiences slightly more precipitation, totaling 68 mm (2.7 in) over 12 days, compared to September's 44 mm (1.7 in) over 8 days. Humidity levels are higher in September at 79%, whereas August has a more comfortable humidity of 73%. For more detailed insights, check out Lyme Regis weather in August.

September weather typically showcases a broader range of temperatures, with a minimum of 4°C (39°F) and a maximum of 28°C (82°F), contributing to an average of 15°C (60°F). The month experiences moderate precipitation, totaling 44 mm (1.7 in) over approximately 8 days and maintaining a humidity level of 79%. In contrast, October brings a noticeable drop in temperatures, with a minimum of 0°C (33°F) and an average of 12°C (54°F), peaking at 21°C (70°F). This month is also wetter, with precipitation reaching 98 mm (3.9 in) over 13 days and a higher humidity level of 89%. For more details on October weather, you can check Lyme Regis weather in October.

September typically experiences warmer temperatures, with a minimum of 4°C (39°F) and an average high of 28°C (82°F), creating a pleasant transition into autumn. The average humidity is relatively high at 79%, accompanied by about 44 mm (1.7 in) of precipitation over 8 days. In contrast, November brings cooler conditions, where temperatures drop significantly, with a minimum of 0°C (32°F) and an average high of only 16°C (61°F). The month is also wetter, with 58 mm (2.3 in) of precipitation spread across 10 days and humidity levels increasing to 90%. For a more detailed look at what to expect, check out Lyme Regis weather in November.

September and December exhibit contrasting weather patterns, with September offering warmer temperatures and more variability in daily highs. During September, the minimum temperature hovers around 4°C (39°F) and peaks at a comfortable 28°C (82°F), averaging 15°C (60°F) overall, while experiencing only 44 mm (1.7 in) of precipitation over 8 days with a humidity level of 79%. In contrast, December brings much colder conditions, starting with a minimum of -1°C (30°F) and a maximum of 15°C (59°F), with an average temperature of 8°C (46°F). Additionally, December sees increased precipitation, totaling 88 mm (3.5 in) spread across 13 days and a higher humidity of 89%. For more details on the specific weather conditions, check out Lyme Regis weather in December.

Compare Lyme Regis's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Lyme Regis

As summer gently wanes, September in Lyme Regis brings a delightful transition. While temperatures can still reach a warm 28°C (82°F), the overall experience is characterized by cooler averages and brisk evenings. With an average temperature of 15°C (60°F), the days are pleasantly mild, but the nighttime chill can dip to around 4°C (39°F). September also witnesses increased rainfall, with about eight rainy days contributing to a total of 44 mm (1.7 in) of precipitation, all while the humidity rests at a relatively high 79%. Unlike the warmer, drier summer months, this shift in weather calls for a cozy sweater and a more nuanced appreciation of the beauty that comes with the changing seasons. For a deeper look into what makes Lyme Regis unique throughout the year, explore the detailed insights in Lyme Regis Climate.