Last updated: March 17, 2025
September in Boscastle, United Kingdom, offers a delightful mix of mild temperatures and the lingering embrace of summer. With a maximum temperature reaching 25°C (78°F) and an average of 15°C (60°F), visitors can enjoy pleasant days before the autumn chill sets in. However, be prepared for the occasional rain, as the area experiences 95 mm (3.8 in) of precipitation over 15 days—making it wise to carry an umbrella. The humidity level hovers around 79%, adding a touch of atmospheric warmth to the coastal scenery. Whether you're exploring the charming village or enjoying coastal walks, September in Boscastle is sure to be an engaging experience despite the showers.
As summer gently fades into autumn, September in Boscastle showcases a delightful transition in temperatures. The month typically sees minimums around 8°C (46°F), with averages peaking at 15°C (60°F), providing a comfortable backdrop for outdoor exploration. The maximum temperatures can reach up to 25°C (78°F), hinting at the lingering warmth of summer. This temperate climate encourages visitors to enjoy the stunning coastal scenery before the cooler months set in, making September an ideal time for both nature walks and local festivities. Overall, the weather reflects a balanced shift, combining the last remnants of warmth with the fresh, crisp air of early autumn.
In September, Boscastle experiences a notable 95 mm (3.8 in) of precipitation, consistent with the rainfall from the previous month. This amount falls over approximately 15 days, suggesting a blend of sunny intervals interspersed with showers. As summer transitions to autumn, precipitation levels remain stable, paralleling the average of recent months. Looking ahead, October presents a significant jump in rainfall, with forecasts predicting 144 mm (5.7 in), indicating a shift towards the wetter fall season. This pattern emphasizes Boscastle's characteristic coastal climate, where wet weather becomes increasingly prevalent as the year draws to a close.
In September, Boscastle experiences a moderate humidity level of 79%, which marks a slight uptick from the drier months of summer, specifically July and August, with humidity levels dipping to 70% and 73% respectively. This gradual increase suggests a transition as the region shifts from the warmth of summer towards the cooler autumn months. Notably, September's humidity remains significantly lower than the winter months, peaking at 90% in November and December. This trend highlights the coastal village's characteristic weather patterns, where humidity tends to be at its highest during the colder seasons. Overall, September serves as a bridge between the pleasant summer and the damp chill of fall in Boscastle, offering a mild yet refreshing atmospheric experience.
As September rolls in, Boscastle experiences a high UV Index of 6, indicating a shift from the peak summer months, yet still requiring attention to sun safety. With a burn time of just 25 minutes, this is a reminder that UV exposure remains significant even as the temperatures begin to cool. The trend shows that while January and February boast a low UV Index, the spring and summer months escalate to very high levels, peaking in June and July. Back in September, although it is lower than summer highs, the UV Index still warrants caution, aligning closely with the high levels seen in April and early May. To stay informed about the sun's intensity in Boscastle throughout the year, check out the Boscastle UV Index.
UV Risk Categories
As the summer fades, September in Boscastle continues to delight residents and visitors alike with a respectable 318 hours of sunshine. This month marks a transition from the peak sun-drenched days of July and August, which boasted over 400 hours of radiant light. While September may not match the high summer totals, it still provides a glorious backdrop for exploring the stunning Cornish coast. The weather remains generally mild, allowing for lingering outdoor adventures before the chill of autumn settles in. As sunlight begins to recede, September serves as a gentle reminder of the vibrant summer just passed, while paving the way for the softer, cozier days of fall.
When it comes to enjoying sunny weather in September in Boscastle, UK, there's a moderate 29% chance of sunshine, making it one of the more favorable months after the brighter spells of April and a peak in May. Following a summer that averages 33% chance of sun in both July and August, September marks a slight downturn, yet it surpasses the gloomier winter months of January through March, which hover around 22% to 33%. As the season shifts, while September may not promise consistent sunshine, its likelihood still outshines the darker days of the year, offering a brief opportunity for outdoor enjoyment before autumn takes hold.
As summer transitions into autumn, September in Boscastle, United Kingdom, experiences a gentle decline in daylight, offering about 12 hours of sunshine each day. This marks a shift from the bright, long days of June and July, which boast a peak of 16 hours, as the region gradually retreats into shorter daylight durations. Following August's warm embrace with 14 hours of daylight, September balances the lingering summer warmth with a subtle autumnal chill. The days continue to lessen, paving the way for the briskness of October, which sees daylight further taper to 10 hours. This trend reflects the natural rhythm of the seasons, where the vibrant energy of summer gives way to the contemplative beauty of fall.
In September, the winds in Boscastle, United Kingdom begin to relax, as evidenced by the average wind speed of 4.2 m/s (9 mph). This gentle breeze marks a transition from the summer's mild gales, peaking at 5.0 m/s (11 mph) in August, signaling the gradual approach of autumn. Notably, September's winds are among the calmest of the year, resembling the serene conditions observed in June and July. As the month wanes, the winds prepare for a shift, with October promising slightly stronger gusts of 6.2 m/s (14 mph), reigniting the energy that characterizes Boscastle's weather later in the year.
The weather in Boscastle 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 Boscastle and find detailed weather information for every month.
September and January present notably different weather conditions. In September, temperatures range from a mild minimum of 8°C (46°F) to a warm maximum of 25°C (78°F), with an average of 15°C (60°F). The month experiences about 95 mm (3.8 in) of precipitation spread over 15 days, accompanied by a humidity level of 79%. In contrast, January is much cooler, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 14°C (58°F), and an average temperature of just 7°C (46°F). Like September, January also sees a similar amount of precipitation at 95 mm (3.8 in) but over slightly fewer days—14. Additionally, humidity tends to be higher in January at 88%. For a detailed look at the weather patterns during this chillier month, you can refer to Boscastle weather in January.
In comparing the weather between September and February, it’s evident that February is significantly colder, with average temperatures ranging from -2°C (29°F) to 14°C (58°F), compared to September's milder range of 8°C (46°F) to 25°C (78°F). Additionally, February experiences slightly more precipitation, totaling 105 mm (4.2 in) over 16 days, compared to September's 95 mm (3.8 in) over 15 days. The humidity is also higher in February at 88%, compared to September's 79%. For those interested in detailed weather conditions during this winter month, you can find more information here: Boscastle weather in February.
September and March present quite contrasting weather conditions. In September, temperatures are milder, ranging from a minimum of 8°C (46°F) to a maximum of 25°C (78°F), creating a pleasant average of 15°C (60°F). In contrast, March experiences chillier temperatures, with lows dipping to -3°C (26°F) and highs reaching only 17°C (63°F), resulting in a cooler average of 8°C (47°F). Both months see considerable precipitation, with September receiving 95 mm (3.8 in) over 15 days, while March has slightly higher rainfall at 102 mm (4.0 in) across 17 days. Additionally, March has a higher humidity level at 86%, compared to September’s 79%. For more specific details about March weather, check out Boscastle weather in March.
September's weather is characterized by milder temperatures, with an average of 15°C (60°F) and highs reaching up to 25°C (78°F). In contrast, April experiences cooler conditions, with an average temperature of 10°C (50°F) and maximums of 20°C (68°F). While September sees more rainfall, totaling 95 mm (3.8 in) over 15 days, April tends to be drier, with only 51 mm (2.0 in) across 10 days. Additionally, humidity levels remain relatively high in both months, with September at 79% and April slightly higher at 84%. For a detailed look at April weather, you can check Boscastle weather in April.
In comparing the weather between September and May, September tends to be warmer overall, with average temperatures reaching around 15°C (60°F) compared to May's average of 12°C (54°F). The maximum temperature in September can peak at 25°C (78°F), whereas May's maximum is slightly lower at 22°C (71°F). However, September experiences more precipitation, with 95 mm (3.8 in) over 15 days, compared to May's 72 mm (2.8 in) over 13 days. Humidity levels are fairly comparable, with September at 79% and May at 80%. For more detailed insights, you can check Boscastle weather in May.
When comparing the weather of September and June, both months exhibit similar temperature ranges, with September showing a minimum of 8°C (46°F), an average of 15°C (60°F), and a maximum of 25°C (78°F), while June's temperatures range slightly higher with a minimum of 9°C (48°F) and the same maximum of 25°C (78°F). Precipitation levels are comparable as well, with both months experiencing around 95 mm (3.8 in) in September and 95 mm (3.7 in) in June, though September has one less day of rain, totaling 15 days compared to June’s 16 days. Humidity is slightly lower in September at 79%, compared to June's 80%. For a more detailed look at the weather specifics in June, you can check Boscastle weather in June.
When comparing the weather in September and July, we can see notable differences in temperature and precipitation. September tends to be slightly cooler, with average temperatures reaching 15°C (60°F) compared to July's average of 17°C (62°F). The maximum temperature in September peaks at 25°C (78°F), while July's max is marginally higher at 26°C (79°F). In terms of precipitation, September experiences more rainfall with a total of 95 mm (3.8 in) over 15 days, compared to July's 82 mm (3.2 in) over 13 days. Humidity levels also differ, with September being more humid at 79%, whereas July has a lower humidity level of 70%. For more detailed information on July's weather, you can check out Boscastle weather in July.
The weather in September is generally cooler than in August, with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 25°C (78°F), compared to August's range of 11°C (53°F) to 24°C (76°F). Additionally, September experiences slightly higher precipitation, totaling 95 mm (3.8 in) over 15 days, compared to August's 90 mm (3.6 in) spread over 18 days. The humidity also increases in September to 79%, while August has a lower humidity level of 73%. For a more detailed look at the weather patterns, you can check Boscastle weather in August.
September marks the transition from summer to autumn, with an average temperature of 15°C (60°F) and maximums reaching 25°C (78°F). However, it also brings significant rainfall, totaling 95 mm (3.8 in) over approximately 15 days, along with a humidity level of 79%. In contrast, October experiences cooler conditions with an average temperature of 13°C (55°F) and maximums capping at 20°C (68°F). The month is wetter, with precipitation levels rising to 144 mm (5.7 in) over 18 days and increased humidity at 89%. For more detailed information, you can check Boscastle weather in October.
September tends to be warmer than November, with average temperatures ranging from a minimum of 8°C (46°F) to a maximum of 25°C (78°F), while November cools down to a range of 2°C (35°F) to 16°C (61°F). Precipitation also sees an increase in November, with 125 mm (4.9 in) falling over 20 days compared to September's 95 mm (3.8 in) over 15 days. Additionally, November experiences a higher humidity level at 90%, compared to September’s 79%. For a more detailed look at November weather, you can explore Boscastle weather in November.
September and December present contrasting weather patterns. In September, temperatures range from a pleasant minimum of 8°C (46°F) to a maximum of 25°C (78°F), with an average of 15°C (60°F). The month experiences moderate rainfall, totaling 95 mm (3.8 in) over approximately 15 days, and relative humidity sits at 79%. In stark contrast, December sees much cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 13°C (57°F), resulting in an average of just 9°C (48°F). Rainfall is significantly higher at 165 mm (6.5 in) across about 23 days, accompanied by increased humidity levels of 89%. For a closer look at December weather specifics, you can visit Boscastle weather in December.
September in Boscastle marks a transition from the warmth of summer to the cooler embrace of autumn. While temperatures remain mild with an average around 15°C (60°F), the month can still surprise with peaks that reach 25°C (78°F). This blend of warmth and the onset of increased precipitation—averaging about 95 mm over 15 days—creates a unique atmosphere, rich in lush greenery but also higher humidity levels at 79%. Compared to the dry heat of previous months, September offers a more refreshing and unpredictable climate, making it a delightful time for exploration. For more detailed insights into what the weather holds throughout the year, explore Boscastle Climate.