September Weather in Inverness, United Kingdom

Last updated: March 17, 2025

Inverness, Scotland, experiences a dynamic September, marked by an average temperature of 12°C (54°F), with peaks reaching a warm 24°C (75°F). The month is characterized by notable humidity levels at 90%, contributing to a rather moist atmosphere. Rainfall is prevalent, with 87 mm (3.4 in) recorded over 16 days, highlighting the region's reputation for variable weather. Visitors to this picturesque location can expect a mix of pleasant warmth and occasional showers, making for a refreshing, if somewhat unpredictable, early autumn experience.

September Temperature in Inverness

Inverness, United Kingdom, experiences a noticeable transition in September as summer gives way to autumn. The month boasts average temperatures around 12°C (54°F), with highs reaching a pleasant 24°C (75°F), making it one of the last opportunities to enjoy mild weather before the chill sets in. While nights cool down to a minimum of 2°C (35°F), the overall trend reflects a gradual decrease in temperatures from the warmer summer months. As the leaves begin to change, visitors can expect crisp mornings and comfortable afternoons, perfect for exploring the scenic beauty of the area. This shift serves as a gentle reminder that autumn is on the horizon, inviting both locals and travelers to savor the last bits of warmth before winter arrives.

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

The chart illustrates September temperature patterns in Inverness, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec393941455055595754484239
Data source: Temperature data for Inverness 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 Inverness

In September, Inverness experiences a noteworthy shift in precipitation patterns, with an increase to 87 mm (3.4 in), making it one of the wetter months of the year. This uptick is reflected in the 16 days of rain, highlighting a trend of late-summer showers as the region transitions into autumn. Comparatively, September's rainfall surpasses that of August and is in line with the wetter October that follows. While the summer months typically see less rain, this autumn precursor brings a sense of change, setting the stage for the cooler, rainier months ahead. The consistent rainfall pattern throughout the year emphasizes Inverness's reputation for its lush, green landscape, sustained by its abundant precipitation.

September Precipitation Trends in Inverness

The chart displays monthly precipitation patterns in Inverness, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7378795181807681871078885
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Inverness

As autumn approaches in Inverness, September experiences a notable increase in humidity, reaching 90%, the highest level since January. This uptick reflects a subtle shift from the summer months, where humidity hovered around 86% in both July and August. The trend shows a gradual rise as the year progresses, with notable peaks in the fall and winter months. October and November follow suit, climbing even higher to 91% and 92%, respectively. Overall, the humidity tends to escalate from late summer through the colder months, creating a lush, moist atmosphere that envelops the picturesque Scottish landscape.

September Average Humidity in Inverness

This chart illustrates the average monthly humidity levels in Inverness, 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%82%84%86%86%90%91%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Inverness

As September rolls into Inverness, the UV Index settles at 5, indicating a moderate exposure category. This marks a slight decline from the peak summer months, illustrating the transition toward autumn. With a burn time of 30 minutes, it’s essential to stay mindful of sun protection, especially during midday hours when UV rays are strongest. Compared to the higher levels seen in June and July, September provides a gentler reminder of the waning sun. As temperatures cool and outdoor activities shift, this month remains a significant time to enjoy the beauty of Inverness while keeping skin safety in check. For more details, visit Inverness UV Index.

Maximum UV Index Levels in Inverness for September

The chart shows the monthly maximum UV Index (UVI) for Inverness 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: Inverness 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 Inverness

As summer transitions into autumn, September in Inverness welcomes a robust 288 hours of sunshine, making it one of the more luminous months of the year. While this total is a noticeable dip from the sun-drenched peak of 396 hours in July, it still stands as a bright moment before the days shorten further. This month marks a gentle decline from the vibrant summer months, with the weather gradually shifting from the warmth of July and August towards the cooler tones of October, which sees a significant drop to 214 hours. The trend emphasizes the fleeting nature of summer sunlight, creating a beautiful and reflective backdrop for those looking to revel in the lingering warmth and vibrant hues of autumn in the Scottish Highlands.

Monthly Sunshine Duration in Inverness: September Highlighted

The September sunshine duration represents the total number of hours Inverness 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.
JanFebMarAprMayJunJulAugSepOctNovDec70h150h210h334h388h390h396h365h288h214h119h82h
Data source: Inverness September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Inverness During September

Inverness experiences a modest 17% chance of sunny weather in September, reflecting a trend where the late summer months tend to offer limited sunshine. Interestingly, despite the promise of longer days, the likelihood of bright skies dips notably from the more favorable conditions seen in April, which enjoys a 36% chance. Following the consistent patterns of July and August—both at 20%—September's sunshine potential can feel a bit lackluster, reminiscent of the somber skies typical of autumn. As the year transitions into autumn, the overall trend suggests that while there are occasional sunny days, visitors should prepare for the unpredictable weather typical of this stunning part of the UK.

Percentage of Sunny Days in September in Inverness

The chart illustrates the percentage of sunny days in Inverness 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 Inverness experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec18%27%16%36%20%24%20%15%17%16%17%17%
Data source: Inverness September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Inverness in September

As summer gracefully transitions into autumn, September in Inverness offers a delightful balance of daylight, with approximately 12 hours illuminating the day. This marks a gentle decline from the sun-soaked days of July and August, which bask in a maximum of 17 and 15 hours of daylight, respectively. However, the shift is not stark; it reflects the natural rhythm of the seasons, providing just enough light for those lingering outdoor activities before the days grow shorter. Following September, daylight continues its downward trend towards October's 10 hours, signaling the approaching winter. Embracing the gradual changes in daylight can enhance appreciation for Inverness’s stunning landscapes, making September a beautiful time to explore.

Average Daylight Hours in Inverness for September

The chart illustrates the variation in daylight duration in Inverness throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 23m9h 26m11h 53m14h 22m16h 38m17h 53m17h 12m15h 8m12h 42m10h 14m7h 58m6h 41m
Data source: Inverness daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Inverness

In September, winds in Inverness begin to pick up slightly, averaging 3.1 m/s (7 mph), setting the stage for the shift into autumn. This month marks a notable increase from the calm of summer, where July and August lingered at a gentle 2.3 m/s (5 mph). As the year progresses, wind speeds generally trend upward, with October seeing a rise to 3.7 m/s (8 mph) and November reaching 4.3 m/s (10 mph). This steady increase hints at the changing seasons, inviting the crisp, invigorating breezes that herald the arrival of fall. Such changes not only enhance the landscape's beauty but also invigorate the spirit of those who experience the vibrant shifts in Inverness’s weather.

Average September Wind Speed in Inverness

The chart displays monthly wind speed patterns in Inverness, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.84.54.12.82.73.32.32.33.1 m/s3.74.33.1
Data source: Inverness September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Inverness Compares to Other Months

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

In September, temperatures in Inverness range from a minimum of 2°C (35°F) to a pleasant maximum of 24°C (75°F), with an average of 12°C (54°F). The month is characterized by relatively high humidity at 90% and receives around 87 mm (3.4 in) of precipitation over 16 days. In contrast, January sees cooler temperatures, with a minimum of -7°C (19°F) and a maximum of 13°C (56°F), averaging only 4°C (39°F). Precipitation drops slightly to 73 mm (2.9 in) over 12 days, accompanied by a humidity level of 89%. This stark contrast highlights the transition from the mild, wet conditions of early autumn to the colder, drier winter month. For more detailed insights on winter weather, check Inverness weather in January.

September weather in Inverness features a mild range of temperatures, with averages around 12°C (54°F) and highs reaching up to 24°C (75°F). However, it also sees significant precipitation, with 87 mm (3.4 in) falling over 16 days, accompanied by high humidity levels of 90%. In contrast, February presents a much colder climate, with average temperatures around 4°C (39°F) and maximums peaking at 15°C (59°F). Precipitation levels are slightly lower at 78 mm (3.1 in) over 14 days, with humidity marginally lower at 88%. For a closer look at what February brings to Inverness, check out Inverness weather in February.

September and March exhibit contrasting weather characteristics. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 24°C (75°F), with an average of 12°C (54°F). This month experiences higher humidity at 90% and sees approximately 87 mm (3.4 in) of precipitation over about 16 days. In contrast, March tends to be chillier, with temperatures fluctuating between a minimum of -5°C (23°F) and a maximum of 17°C (63°F), leading to a lower average of 5°C (41°F). It has slightly less precipitation at 79 mm (3.1 in) occurring over 17 days, and a humidity level of 86%. For more details, check out Inverness weather in March.

When comparing the weather in September and April, we observe noticeable differences in temperature and precipitation. September typically offers milder conditions, with average temperatures ranging from a minimum of 2°C (35°F) to a maximum of 24°C (75°F), while April's temperatures are cooler, with a minimum of -6°C (22°F) and a maximum of 22°C (71°F). Precipitation is more frequent in September, occurring on 16 days and totaling 87 mm (3.4 in), compared to only 51 mm (2.0 in) over 13 days in April. Additionally, September experiences higher humidity levels at 90% versus April's 84%. For more detailed insights about April weather, you can check Inverness weather in April.

Comparing the weather in September and May reveals notable differences. September experiences a broader temperature range, with minimums around 2°C (35°F) and maximums reaching up to 24°C (75°F), averaging at 12°C (54°F). The month also tends to be quite humid, with around 90% humidity and 87 mm (3.4 in) of precipitation over 16 days. In contrast, May starts off cooler with minimum temperatures dropping to -1°C (30°F) but can peak at 25°C (78°F), averaging around 10°C (50°F). May features slightly less precipitation at 81 mm (3.2 in) over 15 days, accompanied by lower humidity at 82%. For more detailed information on May weather, you can visit Inverness weather in May.

In comparing the weather of September and June, September tends to be slightly warmer on average, with temperatures ranging from a minimum of 2°C (35°F) to a maximum of 24°C (75°F), whereas June shows a range from 1°C (34°F) to 28°C (82°F). Both months experience similar precipitation levels, with September receiving 87 mm (3.4 in) over 16 days, compared to June's 80 mm (3.1 in) over 15 days. Humidity is higher in September at 90%, while June has a slightly lower humidity level of 84%. For a more detailed look at June weather specifics, you can visit Inverness weather in June.

In comparing the weather of September and July, we see notable differences in temperature and precipitation. In September, the minimum temperature dips to 2°C (35°F), while the average reaches 12°C (54°F) and can rise to a maximum of 24°C (75°F). This month experiences more precipitation, totaling 87 mm (3.4 in) over 16 days, coupled with high humidity levels at 90%. In contrast, July tends to be warmer, with temperatures ranging from a minimum of 5°C (42°F) to an average of 15°C (59°F), and maximums hitting 28°C (82°F). Precipitation in July is slightly less, at 76 mm (3.0 in) over the same number of days, and humidity sits just a bit lower at 86%. For a more detailed look at July's weather patterns, you can visit Inverness weather in July.

In comparing the weather between September and August, September tends to be slightly cooler with minimum temperatures dropping to 2°C (35°F) compared to August's minimum of 5°C (42°F). The average temperature in September is 12°C (54°F), while August averages at 14°C (58°F). Maximum temperatures remain similar, with September reaching up to 24°C (75°F) and August peaking at 25°C (78°F). Both months experience similar levels of precipitation, with September recording 87 mm (3.4 in) and August slightly lower at 81 mm (3.2 in), both spread over 16 days. Additionally, humidity is higher in September at 90%, compared to 86% in August, contributing to a more damp atmosphere. For more specific details on August weather, you can refer to Inverness weather in August.

September and October present a noticeable shift in weather conditions. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 24°C (75°F), with an average of 12°C (54°F). The month sees about 87 mm (3.4 in) of precipitation over 16 days, with humidity levels at 90%. In contrast, October brings cooler temperatures, with a minimum dipping to -3°C (27°F) and an average of 9°C (48°F), peaking at 18°C (64°F). Rainfall increases to 107 mm (4.2 in) over 20 days, and humidity remains high at 91%. For a closer look at the specific weather details in October, visit Inverness weather in October.

September and November present distinctly different weather patterns. In September, temperatures range from a mild minimum of 2°C (35°F) to a warm maximum of 24°C (75°F), with an average of 12°C (54°F). It also experiences significant precipitation, totaling 87 mm (3.4 in) over 16 days, accompanied by high humidity of 90%. In contrast, November brings cooler temperatures, with a minimum dropping to -5°C (23°F) and an average of just 6°C (43°F). The maximum temperature is milder at 15°C (58°F). Precipitation remains similar, around 88 mm (3.5 in), but spreads across 17 days, with humidity slightly higher at 92%. For more details, check out Inverness weather in November.

September and December present contrasting weather conditions. In September, temperatures are milder, with a minimum of 2°C (35°F) and an average of 12°C (54°F), peaking at 24°C (75°F), while December brings chillier temperatures, ranging from a minimum of -7°C (20°F) to an average of 4°C (40°F), with a maximum of 13°C (55°F). Both months experience similar precipitation levels of around 85-87 mm (3.4 in) over 16 days, but the humidity remains high in both months at 90% and 88%, respectively. For a detailed look at the December weather, you can check Inverness weather in December.

Compare Inverness's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Inverness

As summer transitions into autumn, September in Inverness reveals a delightful yet unpredictable array of weather conditions. With temperatures averaging around a mild 12°C, the warmth of the day gives way to cooler nights, making it feel quite distinct from the peak summer months. This month also brings a significant increase in precipitation, with rain making an appearance on nearly half the days, contributing to a lush, vibrant landscape that is characteristic of this time of year. With humidity levels soaring to 90%, the air feels thick and rich, contrasting sharply with the dryer summer air. For a deeper dive into how these changing patterns shape Inverness’ climate throughout the year, visit Inverness Climate.