Last updated: March 17, 2025
In Stornoway, United Kingdom, the weather in September showcases a striking contrast, with maximum temperatures reaching a pleasant 22°C (71°F) and an average lingering around 13°C (55°F). However, early autumn brings cooler nights, dropping to a minimum of 1°C (35°F). This month is notably wet, contributing to a total precipitation of 110 mm (4.3 in) over 19 days, casting a misty veil over the landscape. With an average humidity of 87%, the air feels brisk and refreshing, embodying the quintessential charm of the Scottish Isles in early fall.
As September rolls into Stornoway, the temperatures begin to shift, marking a transition from summer's warmth to the crispness of autumn. The month starts with minimums around 1°C (35°F), providing a cooler backdrop as the average temperature hovers at a comfortable 13°C (55°F). Daily highs can still reach a pleasant 22°C (71°F), reclaiming some of the summer’s lingering warmth. Interestingly, while September remains milder than the chill of deeper autumn months, it serves as a reminder of the winter chills ahead, contrasting sharply with July and August when temperatures peaked at around 25°C (77°F) and 22°C (71°F) respectively. This gradual cooling pattern captures the essence of Stornoway's maritime climate, where the change of seasons is both subtle and beautifully pronounced.
In September, Stornoway experiences a notable uptick in precipitation, recording 110 mm (4.3 inches) of rainfall over 19 days, marking it as one of the wettest months of the year. This surge in rainfall follows a relatively steady pattern observed in the preceding summer months, where precipitation levels hovered around 89 mm to 102 mm. As autumn approaches, it’s clear that September transitions Stornoway into a wetter spell, setting the stage for the even more significant rainfall expected in October, which typically exceeds 128 mm (5.0 inches). This pattern emphasizes the island's characteristic shift from the drier summer months to the damp conditions of fall, captivating those who observe the persistent yet picturesque weather of this unique coastal region.
September in Stornoway sees humidity levels rise to 87%, matching the peak levels of July, and creating a notably damp atmosphere that characterizes the transition into autumn. This month typically marks the culmination of a gradual increase in humidity that began in the spring, as Stornoway experiences a steady climb from 81% in January to this late-summer high. The lingering warmth of August, with its 86% humidity, seamlessly flows into September, maintaining a consistently moist environment that can be both refreshing and challenging for outdoor activities. As the year progresses into October, humidity slightly dips to 86%, hinting at the cooling changes that lie ahead. Overall, September exemplifies the region's characteristic wetness, making it one of the most humid months of the year.
As September arrives in Stornoway, the UV Index experiences a notable shift, dropping to a moderate level of 4. This indicates a manageable risk for sun exposure, with a burn time of 30 minutes for fair-skinned individuals. The month follows a summer of higher UV levels, peaking at 7 in July and August, prompting residents and visitors to be more vigilant about sun safety. As autumn sets in, the trend towards lower UV levels continues, with the Index falling to 2 by October, signaling the onset of lower sun intensity. Nevertheless, it's wise to remain mindful of UV exposure even in the early fall. For a detailed overview and daily updates on UV conditions, check out Stornoway UV Index.
UV Risk Categories
As summer gives way to autumn, September in Stornoway embraces a delightful blend of warmth and change, offering an impressive 277 hours of sunshine. While the month sees a dip from the sun-drenched peaks of late spring and summer, where June soared to nearly 400 hours, it still stands out as a bright beacon against the winter months ahead. This gradual decline in sunlight is mirrored in the seasonal transition from May's vibrant 389 hours to October's 206 hours, yet September remains a cherished time for local festivities and outdoor explorations, as the landscape is painted in autumn's rich hues. With days still relatively long and comfortable, September invites visitors to bask in the fading warmth of the sun before the shorter days settle in.
In Stornoway, United Kingdom, the likelihood of enjoying sunny weather in September is relatively low, with only a 15% chance of sunshine. This trend of limited sun continues from the summer months, showing only a slight decrease in sunny days from August's 16%. As autumn approaches, the chances remain fairly stagnant before gradually improving in the later months, with October and November showing a slight uptick to 19%. Overall, September's cool, cloudy weather exemplifies the region's typical maritime climate, where sunny days are cherished yet sparse.
As summer fades into autumn, September in Stornoway, United Kingdom marks a notable shift in daylight, with the sun providing around 12 hours of light each day. This decrease follows the height of summer, where June boasts a remarkable 18 hours of daylight, creating a stark contrast. The gradual transition from the longer days of June and July to the shorter hours of October reflects the encroaching winter, as daylight diminishes steadily through the season. September, with its ample yet reduced daylight, offers a beautiful balance, allowing residents to savor the lingering warmth of summer before the darker months set in.
As the summer days wane, September brings a welcome shift in Stornoway's wind patterns, with an average speed of 4.9 m/s (11 mph). This gentle breeze offers a noticeable increase from the calmer currents of July and August, which saw their winds drop to around 3.3 m/s (7 mph) and 3.5 m/s (8 mph) respectively. Gradually, as autumn approaches, wind speeds pick up momentum, hinting at the seasonal transition ahead. Compared to earlier months, this uptick in wind can invigorate the sense of change in the air, as nature prepares for the gustier days of October and November, where winds reach averages of 5.6 m/s (13 mph) and 6.5 m/s (15 mph). Thus, September serves as a delightful prelude, blending the lingering warmth of summer with the crisp, refreshing essence of fall.
The weather in Stornoway 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 Stornoway and find detailed weather information for every month.
September and January present contrasting weather patterns. In September, temperatures range from a chilly 1°C (35°F) to a warm 22°C (71°F), with an average of 13°C (55°F). The month sees significant rainfall of 110 mm (4.3 in) over 19 days, along with high humidity at 87%. In contrast, January's temperatures drop considerably, with lows of -3°C (27°F) and highs reaching only 13°C (56°F), averaging at 6°C (43°F). Precipitation is lower at 77 mm (3.0 in) over 13 days, and humidity is slightly reduced at 81%. For a deeper look at January conditions, visit Stornoway weather in January.
In comparing the weather between September and February, September tends to be significantly warmer, with average temperatures ranging from 1°C (35°F) to a peak of 22°C (71°F), while February experiences cooler temperatures, with an average range from -3°C (26°F) to 14°C (57°F). Precipitation is relatively high in both months, with September receiving 110 mm (4.3 in) over 19 days and February slightly less at 99 mm (3.9 in) across 16 days. Humidity is higher in September at 87%, compared to February's 80%, indicating a more muggy feel during the early fall. For a more detailed look at February conditions, visit Stornoway weather in February.
When comparing the weather in September and March, noticeable differences emerge in both temperature and precipitation. September boasts milder temperatures, with a minimum of 1°C (35°F) and an average of 13°C (55°F), while March is cooler, beginning at a minimum of -3°C (27°F) and averaging 7°C (44°F). Rainfall is similar in both months, with September recording 110 mm (4.3 in) and March slightly less at 102 mm (4.0 in), each experiencing precipitation on about 19 days. Humidity levels are higher in September at 87%, compared to March's 80%. For more detailed insights, you can check Stornoway weather in March.
The weather in September tends to be milder compared to April, with average temperatures ranging from 1°C (35°F) to 22°C (71°F), which is generally more comfortable for outdoor activities. In contrast, April experiences cooler temperatures, from a minimum of -2°C (29°F) to a maximum of 21°C (70°F), making it feel chillier overall. September sees higher precipitation, with about 110 mm (4.3 in) over 19 days, while April has less rain at 63 mm (2.5 in) across 15 days. Additionally, September has higher humidity levels at 87%, compared to April's 80%. For a closer look at the conditions specific to April, you can check Stornoway weather in April.
In comparing the weather of September and May, we see distinct differences that highlight the transition from late summer to early autumn. September enjoys a more comfortable average temperature of 13°C (55°F) with maximums reaching up to 22°C (71°F), while May has a slightly lower average temperature of 10°C (51°F) with highs of 24°C (75°F). Despite May having warmer highs, it also experiences cooler minimums, dipping to -1°C (31°F). In terms of precipitation, September is notably wetter, receiving 110 mm (4.3 in) over 19 days, compared to May's 73 mm (2.9 in) over 17 days. Humidity levels are also slightly higher in September at 87%, while May stands at 83%. For a more detailed look, you can check Stornoway weather in May.
September and June exhibit distinct weather patterns. In September, temperatures range from a chilly minimum of 1°C (35°F) to a pleasant maximum of 22°C (71°F), with an average temperature similar to June at 13°C (55°F). However, September experiences significantly more rainfall, boasting 110 mm (4.3 in) over 19 days, compared to June's 70 mm (2.7 in) over just 15 days. Humidity is slightly higher in September at 87%, while June maintains a comfortable level of 84%. For a closer look at June weather specifics, you can visit Stornoway weather in June.
In comparing the weather of September and July, we see notable differences in temperature and precipitation patterns. September experiences a wider range of temperatures, with a minimum of 1°C (35°F) and a maximum of 22°C (71°F), averaging 13°C (55°F), while July features milder temperatures, ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F) with an average of 14°C (58°F). Additionally, September has higher precipitation levels with 110 mm (4.3 in) over 19 days, compared to July's 89 mm (3.5 in) over the same number of days. Despite similar humidity levels at 87% in both months, the shift in temperature and rainfall makes September feel considerably cooler and wetter than July. For further details, you can refer to Stornoway weather in July.
In comparing the weather of September and August, we see notable differences in temperature and precipitation patterns. September experiences slightly cooler temperatures, with a minimum of 1°C (35°F) and an average of 13°C (55°F), compared to August's milder minimum of 6°C (44°F) and average of 14°C (58°F). Both months reach a maximum temperature of 22°C (71°F), but September has a higher overall precipitation of 110 mm (4.3 in) over 19 days, while August records 102 mm (4.0 in) over 20 days. Humidity remains similar, with September at 87% and August at 86%. For more details on August's weather, you can refer to Stornoway weather in August.
In September, the weather can be characterized by moderate temperatures, ranging from a minimum of 1°C (35°F) to a maximum of 22°C (71°F) with an average of 13°C (55°F). The month experiences significant precipitation, totaling 110 mm (4.3 in) over 19 days, and high humidity at 87%. As we transition into October, the temperatures drop slightly, with a minimum of 0°C (33°F) and a maximum of 17°C (63°F), averaging 10°C (51°F). Precipitation increases to 128 mm (5.0 in), occurring on 20 days, while humidity remains relatively steady at 86%. Overall, October tends to be cooler and wetter compared to September. For more detailed information, you can check Stornoway weather in October.
September and November exhibit distinct weather patterns that mark the transition from late summer to late autumn. In September, the temperature ranges from a minimum of 1°C (35°F) to a maximum of 22°C (71°F), with an average of 13°C (55°F). This month sees significant rainfall, with 110 mm (4.3 in) over 19 days and a high humidity level of 87%. In contrast, November experiences cooler temperatures, with a minimum of -3°C (28°F) and a maximum of 15°C (60°F), averaging at 8°C (46°F). Rainfall is slightly lower at 106 mm (4.2 in) over 17 days, and the humidity is marginally lower at 85%. For more detailed insights into November weather, visit Stornoway weather in November.
In September, the weather in Stornoway exhibits a mild transition from summer, with temperatures ranging from a chilly 1°C (35°F) at night to a comfortable 22°C (71°F) during the day. The precipitation is relatively high, totaling 110 mm (4.3 in) over 19 days, contributing to the high humidity of 87%. In contrast, December ushers in winter, with cooler temperatures that dip to a minimum of -3°C (27°F) and average around 6°C (43°F), peaking at a maximum of 14°C (57°F). While December sees slightly less precipitation at 98 mm (3.8 in) over 18 days, the humidity drops to 79%, making the air feel crisper than in September. For a more detailed comparison, you can check Stornoway weather in December.
As September unfolds in Stornoway, the weather presents a distinct shift from the summer bliss, enveloping the town in a cooler embrace that signals the onset of autumn. Temperatures begin to dip, with a notable increase in moisture, as the sky often greets residents with cloudy days and intermittent rain. The high humidity levels create a refreshing atmosphere, albeit one that can feel a bit damp at times. Overall, September's weather offers a refreshing change, emphasized by a noticeable uptick in precipitation days compared to the summer months, providing a lush backdrop for the early fall scenery. For a more in-depth look at the weather patterns, check out the detailed Stornoway Climate.