September Weather in Mallaig, United Kingdom

Last updated: March 17, 2025

September in Mallaig, United Kingdom offers a blend of mild weather and frequent rainfall, creating a unique atmosphere for visitors. With maximum temperatures reaching 21°C (70°F) and an average of 12°C (54°F), the month remains relatively warm, although nights can be cool, dipping to a minimum of 4°C (39°F). Rainfall is a significant feature, with an impressive 254 mm (10.0 in) distributed over 21 days, resulting in a humidity level of 89% that enhances the lush greenery of the region. Those exploring Mallaig in September should prepare for a variety of weather, making it the perfect time to experience the stunning landscape enveloped in mist!

September Temperature in Mallaig

In September, Mallaig, United Kingdom, experiences a refreshing transition as summer bids farewell. With minimum temperatures around 4°C (39°F) and averages hovering at a mild 12°C (54°F), the weather remains inviting for outdoor adventures. Days can still reach a pleasant maximum of 21°C (70°F), making it ideal for exploring the stunning coastal scenery or enjoying local festivities. As September unfolds, the gradual cooling begins to hint at the approach of autumn, yet the warmth still lingers, reflecting a charming blend of late summer and early fall that enchants visitors and locals alike.

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

The chart illustrates September temperature patterns in Mallaig, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414042454954565654494542
Data source: Temperature data for Mallaig 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 Mallaig

September in Mallaig, United Kingdom, marks a notable peak in precipitation, with an average of 254 mm (10.0 in) falling over approximately 21 days. This makes September the wettest month in the year, surpassing both the summer months and the preceding August, which saw 218 mm (8.6 in). The trend of increasing rainfall carries into October, which continues the pattern with even heavier precipitation, reaching 358 mm (14.1 in) over 24 days. As autumn sets in, Mallaig experiences a significant shift in weather, highlighting a seasonal transition characterized by increased moisture and frequent rain.

September Precipitation Trends in Mallaig

The chart displays monthly precipitation patterns in Mallaig, 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.
JanFebMarAprMayJunJulAugSepOctNovDec21724122690107156175218254358243264
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mallaig

In Mallaig, United Kingdom, September brings a notable rise in humidity, peaking at 89%. This increase can be seen as part of a broader trend towards higher moisture levels as the year progresses, with the summer months of July and August already showcasing high humidity at 87% and 88%, respectively. As autumn sets in, the humidity remains elevated, continuing into October at the same level. This sustained dampness suggests that Mallaig experiences a significant maritime influence, especially as it transitions from the warmth of summer to the cooler embrace of fall. Overall, the average humidity over the months illustrates a slight decline from January’s 86% to May’s low of 82%, before rising again as the year approaches its end, culminating in the more humid conditions of winter.

September Average Humidity in Mallaig

This chart illustrates the average monthly humidity levels in Mallaig, 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.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%84%82%84%88%88%89%90%90%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mallaig

As September arrives in Mallaig, the UV Index reflects a moderate level of exposure, registering at 5. This indicates a transition from the high levels experienced in the summer months, where sunburn can occur within 25 minutes, to a more manageable situation with a burn time of around 30 minutes. While outdoor enthusiasts can still enjoy pleasant weather, it’s wise to remain cautious; UV rays can still be potent. As the days shorten and the temperatures begin to cool, this month serves as a gentle reminder to protect your skin without becoming overly complacent. For more detailed information on UV levels, visit Mallaig UV Index.

Maximum UV Index Levels in Mallaig for September

The chart shows the monthly maximum UV Index (UVI) for Mallaig 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.
JanFebMarAprMayJunJulAugSepOctNovDec123568765311
Data source: Mallaig 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 Mallaig

As autumn begins to embrace Mallaig, September offers a delightful respite with 244 hours of sunshine, a notable decrease from the vibrant summer months but still a generous stretch for outdoor activities. Following the sun-drenched peak of May, which boasts 359 hours, and the warm glow of summer with July reaching 348 hours, September gently ushers in the transition toward shorter days. Despite the cooler temperatures, the tail end of summer illuminates the rugged landscapes of this charming coastal town, making it an ideal time to explore before the weather shifts more dramatically in October, when sunshine dips to 182 hours. Embrace the milder days of September in Mallaig, where the lingering warmth of summer still casts a golden glow over the scenery.

Monthly Sunshine Duration in Mallaig: September Highlighted

The September sunshine duration represents the total number of hours Mallaig 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.
JanFebMarAprMayJunJulAugSepOctNovDec50h115h165h307h359h352h348h321h244h182h101h57h
Data source: Mallaig September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mallaig During September

In Mallaig, the likelihood of sunny weather in September is relatively low, with the chance of sunshine dropping to 16%. This marks a decline from the brightness seen in the spring months, particularly in April, which enjoys a more favorable 43% chance of sunshine. As the year progresses, September's sunlit days trend downward, aligning more closely with the cloudier months that follow, such as October and November. Despite the occasional sunny spell, visitors should prepare for the characteristic changeable weather of the region, highlighting the importance of versatile travel plans.

Percentage of Sunny Days in September in Mallaig

The chart illustrates the percentage of sunny days in Mallaig 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 Mallaig experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec24%28%14%43%29%22%21%25%16%12%17%15%
Data source: Mallaig September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mallaig in September

As summer transitions into autumn, September in Mallaig, United Kingdom, witnesses a notable shift in daylight duration, offering about 12 hours of light each day. This is a gradual decline from the sun-drenched days of June and July, which boast the longest daylight hours at 17 hours. Following the vibrant summer months, where daylight peaks, September marks a gentle easing into fall, with days still long enough to enjoy the stunning landscapes but noticeably shorter than the previous months. The daylight then diminishes further into October, highlighting a natural rhythm that mirrors the changing seasons, allowing both residents and visitors to savor the last warm days before winter descends.

Average Daylight Hours in Mallaig for September

The chart illustrates the variation in daylight duration in Mallaig throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 28m9h 29m11h 53m14h 20m16h 32m17h 45m17h 5m15h 4m12h 42m10h 16m8h 3m6h 48m
Data source: Mallaig daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mallaig

As September arrives in Mallaig, the wind begins to pick up slightly, averaging 4.0 m/s (9 mph), a modest increase that transitions the region from the lighter breezes of summer. Throughout the warmer months, wind speeds dipped to their lowest in July, at 2.5 m/s (6 mph), inviting calm and serene days by the water. However, as autumn approaches, the winds start to gather strength again, foreshadowing the blustery conditions of October and November, which typically bring speedier gusts averaging 5.1 m/s (11 mph) and 5.9 m/s (13 mph), respectively. This gentle uptick in September serves as a reminder that change is in the air, making it a perfect time to experience the crisp, invigorating breezes that define Mallaig's transition into fall.

Average September Wind Speed in Mallaig

The chart displays monthly wind speed patterns in Mallaig, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.26.44.83.93.74.12.53.04.0 m/s5.15.94.7
Data source: Mallaig September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mallaig Compares to Other Months

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

In comparing the weather between September and January, we see distinct seasonal differences. September tends to be milder, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (70°F), contrasted with January, where temperatures drop, peaking at just 12°C (53°F) and dipping as low as -3°C (27°F). Precipitation levels are relatively high in both months, with September receiving 254 mm (10.0 in) over 21 days, while January sees slightly less precipitation at 217 mm (8.6 in) across 19 days. Humidity remains fairly consistent, with September at 89% and January at 86%. For more detailed information on January weather in Mallaig, you can check this link: Mallaig weather in January.

September weather offers a more temperate experience with average temperatures ranging from a chilly 4°C (39°F) to a pleasant 21°C (70°F). In contrast, February presents a much colder climate, with average temperatures from -5°C (24°F) to a maximum of 12°C (53°F). Both months experience significant precipitation, with September receiving slightly more at 254 mm (10.0 in) compared to February's 241 mm (9.5 in), but they both feature a similar number of rainy days. Additionally, September tends to be more humid at 89%, while February sees a marginally lower humidity level of 85%. For a closer look at February's weather specifically in Mallaig, visit Mallaig weather in February.

When comparing the weather in September and March, we see notable differences in temperature and condition. September tends to be milder, with average temperatures ranging from a chilly 4°C (39°F) to a pleasant 21°C (70°F), while March experiences cooler conditions, with averages between -4°C (25°F) and 14°C (58°F).

Precipitation levels are slightly higher in September, with 254 mm (10.0 in) falling over 21 days, compared to 226 mm (8.9 in) in March, which sees rain on 22 days. Both months have high humidity, but September's at 89% slightly exceeds March's 85%. For a more detailed look at March weather, you can visit Mallaig weather in March.

When comparing the weather in September and April, a noticeable contrast emerges. September tends to be warmer with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 21°C (70°F), while April's temperatures start from a minimum of -1°C (31°F) and peak at 18°C (64°F). Although September is generally wetter, receiving 254 mm (10.0 in) of precipitation over 21 days, April is still quite damp with 90 mm (3.5 in) of rain spread across 15 days. Humidity levels are slightly higher in September at 89%, compared to April's 84%. For a detailed look at the weather specifics for April, you can check Mallaig weather in April.

When comparing the weather in September and May, both months experience similar maximum temperatures, hovering around 21°C (70°F). However, September tends to be slightly warmer on average, with temperatures averaging 12°C (54°F) compared to May's 10°C (50°F). Rainfall is significantly higher in September, with 254 mm (10.0 in) spread over 21 days, while May sees only 107 mm (4.2 in) over 16 days. Additionally, September's humidity levels are higher at 89%, compared to May's 82%. For more detailed information about the climate in May, you can check Mallaig weather in May.

In comparing the weather between September and June, both months feature similar average temperatures, hovering around 12°C (54°F), but September experiences slightly cooler minimums and maximums, ranging from 4°C (39°F) to 21°C (70°F), compared to June's 5°C (41°F) to 21°C (71°F). Additionally, September is notably wetter, with a substantial 254 mm (10.0 in) of precipitation over 21 days, whereas June sees less rainfall at 156 mm (6.1 in) across 19 days. The humidity levels are also higher in September at 89%, compared to June’s 84%, making for a more muggy feel by the end of summer. For more details on June's weather, visit Mallaig weather in June.

September's weather shows a notable transition into autumn, with average temperatures ranging from a cool 4°C (39°F) at night to a mild 21°C (70°F) during the day. In contrast, July's temperatures are generally warmer, with a minimum of 7°C (46°F) and a maximum of 23°C (74°F), creating a more comfortable summer atmosphere. Additionally, September experiences significantly higher precipitation, totaling 254 mm (10.0 in) compared to July's 175 mm (6.9 in), despite both months having rainfall on 21 days. Humidity levels remain relatively similar, with September at 89% and July at 87%. For more detailed weather information, check out Mallaig weather in July.

In comparing the weather between September and August, September tends to be cooler, with a minimum temperature of 4°C (39°F) compared to August's minimum of 8°C (47°F). Both months have the same maximum temperature of 21°C (70°F), but September has a lower average temperature of 12°C (54°F) versus August's 14°C (57°F). While August experiences slightly less precipitation at 218 mm (8.6 in) over 23 days, September sees increased rainfall totaling 254 mm (10.0 in) spread over 21 days. Humidity levels are quite similar, with September at 89% and August at 88%. For a closer look at August weather details, you can check Mallaig weather in August.

September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 21°C (70°F), with an average of 12°C (54°F). The month experiences substantial rainfall, totaling 254 mm (10.0 in) over 21 days, while humidity remains high at 89%. In contrast, October sees a slight decrease in temperatures, with minimums dropping to 2°C (35°F) and maximums settling at 17°C (63°F), averaging around 10°C (50°F). Precipitation increases to 358 mm (14.1 in) across 24 days, maintaining the same humidity level of 89%. Thus, while both months are characterized by high humidity, October is noticeably cooler and wetter. For more detailed information, check out Mallaig weather in October.

September and November present distinct weather patterns. In September, temperatures commonly range from a minimum of 4°C (39°F) to a maximum of 21°C (70°F), with an average of 12°C (54°F). This month sees significant rainfall, totaling 254 mm (10.0 in) over about 21 days, with humidity levels at 89%. In contrast, November experiences cooler conditions, with temperatures dropping to a minimum of -1°C (31°F) and a maximum of 13°C (56°F), averaging around 7°C (45°F). Rainfall is slightly less, at 243 mm (9.6 in) over 22 days, and humidity rises slightly to 90%. For more specific insights about November weather, you can check Mallaig weather in November.

In September, the weather is relatively mild, with temperatures ranging from a low of 4°C (39°F) to a high of 21°C (70°F), and an average temperature of 12°C (54°F). This month also witnesses considerable rainfall, with 254 mm (10.0 in) of precipitation over 21 days, contributing to a high humidity level of 89%. In contrast, December brings colder temperatures, ranging from a minimum of -4°C (25°F) to a maximum of 11°C (52°F), with an average of 5°C (42°F). Precipitation increases slightly to 264 mm (10.4 in) over 24 days, while humidity remains fairly high at 86%. For more detailed weather information specific to December, you can visit Mallaig weather in December.

Compare Mallaig's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mallaig

As September arrives in Mallaig, the weather begins to transition from the warmer days of summer to the cool embrace of autumn. The increased precipitation, with many days marked by rain, creates a distinctively damp atmosphere, characterized by high humidity levels that often linger in the air. Despite the temperature dropping from peak summer highs, the average still holds a comfortable yet brisk edge, making it a unique time to experience Mallaig's stunning scenery. For those looking to explore this picturesque coastal town during September, understanding its climate is essential. Discover more about what to expect in this picturesque region by visiting Mallaig Climate.