September Weather in Glasgow, United Kingdom

Last updated: March 17, 2025

September in Glasgow, United Kingdom presents a vivid tapestry of weather, with temperatures ranging from a chilly minimum of 1°C (33°F) to a warm maximum of 27°C (80°F). The average temperature sits comfortably at 13°C (55°F), offering a refreshing yet temperate atmosphere. However, this transitional month is punctuated by frequent rain, with a total precipitation of 91 mm (3.6 in) over roughly 15 days, contributing to an elevated humidity level of 88%. Whether basking in the sun or caught in a drizzle, Glasgow’s September weather evokes the city's dynamic and ever-changing charm.

September Temperature in Glasgow

As September unwinds in Glasgow, the city experiences a gentle transition toward autumn, showcasing a distinct shift in temperatures. With minimums gracefully rising to 1°C (33°F) and average values settling around 13°C (55°F), there's a refreshing crispness in the air. The maximum temperatures can still flirt with warmth, reaching up to 27°C (80°F) on pleasant days, reminiscent of summer’s last hurrah. This month serves as a bridge, blending the lingering warmth of summer with the cooling embrace of fall, making it an ideal time to explore the city's vibrant outdoor spaces as leaves begin to turn and the atmosphere shifts.

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

The chart illustrates September temperature patterns in Glasgow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec404143465257595855504441
Data source: Temperature data for Glasgow 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 Glasgow

September in Glasgow brings a moderate blend of rainfall, with an average precipitation of 91 mm (3.6 in) across about 15 days. This marks a slight decrease from August's higher levels, where 127 mm (5.0 in) fell over 19 days. As summer wanes, the weather transitions toward more typical autumn conditions, yet Glasgow's skies remain reliably damp. Compared to the more intense rainfall experienced earlier in the year—particularly in February and October, which record 129 mm (5.1 in) and 130 mm (5.1 in) respectively—September offers a brief respite without straying from its rainy reputation. It's a month where umbrellas and waterproofs are still essential, as the seasonal shift leads into the wetter months ahead, illustrating Glasgow's characteristic drizzles and sporadic heavier downpours.

September Precipitation Trends in Glasgow

The chart displays monthly precipitation patterns in Glasgow, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8412910644671139812791130105117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glasgow

In Glasgow, September ushers in a slight uptick in humidity, climbing to 88% after the summer months. This marks a transition as the city experiences a shift from the drier conditions of late spring and early summer, where humidity dips to a comfortable 80% in May before hovering around 82% throughout July and August. With autumn approaching, September's moisture levels are reminiscent of the late winter months, reflecting the city's characteristic dampness. As the year progresses into October, humidity peaks again at 90%, suggesting that Glaswegians should be prepared for the cozy, misty atmosphere that is all too familiar in the heart of Scotland.

September Average Humidity in Glasgow

This chart illustrates the average monthly humidity levels in Glasgow, 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.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glasgow

As September rolls into Glasgow, the UV Index reflects a moderate level at 5, providing a slight decrease from the summer peak but still indicative of increased sun exposure. With a burn time of just 30 minutes, it's essential to remain vigilant when enjoying the outdoors. This month marks a transition; after the high and very high UV levels of June and July, where skin protection was critical, September brings a comfortable respite, yet still warrants caution. As the days grow shorter and the temperatures begin to dip, the trend shows a gradual decline in UV intensity as we approach autumn. Staying informed about the UV levels can help ensure enjoyable and safe sun exposure. For detailed information, visit Glasgow UV Index.

Maximum UV Index Levels in Glasgow for September

The chart shows the monthly maximum UV Index (UVI) for Glasgow 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.
JanFebMarAprMayJunJulAugSepOctNovDec123568865311
Data source: Glasgow 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 Glasgow

As summer fades and autumn approaches, September in Glasgow brings a gentle transition characterized by 274 hours of sunshine. This marks a notable decrease from the sun-drenched days of July and August, which boast peak hours of 390 and 344, respectively. However, September still shines brighter than the dreary months ahead, notably outpacing October, which sees just 204 hours of sunlight. With the vibrant shades of early autumn foliage, September invites both locals and visitors to relish in the pleasant, albeit waning, warmth before winter sets in, making it a time to savor the last vestiges of summer's glow.

Monthly Sunshine Duration in Glasgow: September Highlighted

The September sunshine duration represents the total number of hours Glasgow 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.
JanFebMarAprMayJunJulAugSepOctNovDec68h128h181h316h389h378h390h344h274h204h108h71h
Data source: Glasgow September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Glasgow During September

While September in Glasgow marks the transition into autumn, the likelihood of enjoying sunny weather remains relatively low, with a mere 18% chance of sunshine. This trend reflects a consistent decline in sunny days as summer winds down, contrasting sharply with the more promising 47% sunshine statistic observed in April. Following the bright spells of spring and early summer, Glasgow residents and visitors might find September's weather somewhat dreary, especially in comparison to the preceding months, where the chances of sunshine ranged from 22% to 30%. As the days grow shorter and temperatures begin to drop, September's cloudy skies are a reminder to embrace the cozy comforts of autumn instead of relying on those elusive rays of sunshine.

Percentage of Sunny Days in September in Glasgow

The chart illustrates the percentage of sunny days in Glasgow 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 Glasgow experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%25%19%47%30%22%30%26%19%17%26%16%
Data source: Glasgow September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Glasgow in September

As summer fades into autumn, September in Glasgow offers a delightful 12 hours of daylight, a gradual transition from the longer days of July and August. This month's daylight duration signals a shift in the seasons, marking a drop from the sun-drenched 16 hours of summer to a cozy, yet substantial amount of light. Following the peak in June, where daylight reaches its zenith at 17 hours, September’s softer sun still allows residents ample time to enjoy the unfolding autumn scenery. As the days steadily shorten into October, the rhythm of natural light continues to remind us of nature's elegant cycles.

Average Daylight Hours in Glasgow for September

The chart illustrates the variation in daylight duration in Glasgow throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 42m9h 36m11h 53m14h 13m16h 19m17h 26m16h 50m14h 56m12h 40m10h 21m8h 14m7h 5m
Data source: Glasgow daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Glasgow

As September arrives in Glasgow, the winds begin to shift, settling at an average speed of 3.2 m/s (7 mph). This slight uptick reflects a consistent pattern; while summer months exhibit lighter breezes—particularly July, which registers the calmest winds at 2.2 m/s (5 mph)—the arrival of autumn sees an increase in air movement. Following a gentle August, the September wind paves the way for the more robust gusts of October and November, which average 4.2 m/s (9 mph) and 4.3 m/s (10 mph), respectively. This gradual transition not only signals the seasonal change but also hints at the invigorating, brisk days ahead, making September a month of refreshing winds and awakening anticipation for the months to come.

Average September Wind Speed in Glasgow

The chart displays monthly wind speed patterns in Glasgow, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.35.54.42.83.13.32.22.73.2 m/s4.24.33.6
Data source: Glasgow September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Glasgow Compares to Other Months

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

September and January present quite contrasting weather conditions. In September, temperatures range from a chilly 1°C (33°F) at night to a warm 27°C (80°F) during the day, with an average of 13°C (55°F). This month also sees significant rainfall, with 91 mm (3.6 in) of precipitation spread over 15 days and a high humidity level of 88%. In stark contrast, January experiences colder temperatures, with a minimum of -7°C (20°F) and a maximum of only 14°C (57°F), averaging around 5°C (41°F). Precipitation in January is slightly lower at 84 mm (3.3 in) over 12 days, accompanied by a humidity level of 90%. For more detailed insights, you can visit Glasgow weather in January.

September and February showcase contrasting weather patterns. In September, temperatures range from a mild minimum of 1°C (33°F) to a comfortable maximum of 27°C (80°F), with an average of 13°C (55°F). The month experiences around 91 mm (3.6 in) of precipitation over 15 days, while humidity remains high at 88%. On the other hand, February brings colder conditions with temperatures dipping as low as -5°C (23°F) and peaking at 15°C (59°F), averaging just 5°C (41°F). This month sees increased rainfall of 129 mm (5.1 in) over 17 days, yet maintains the same high humidity level of 88%. For more detailed insights, check out Glasgow weather in February.

When comparing the weather in September and March, notable differences emerge in both temperature and precipitation. September typically features a mild temperature range, with average highs around 27°C (80°F) and an average of 13°C (55°F), whereas March tends to be cooler, with average highs reaching only 17°C (63°F). In terms of precipitation, March experiences slightly more, with 106 mm (4.2 in) over 17 days compared to September's 91 mm (3.6 in) over 15 days. Additionally, humidity levels remain relatively high in both months, at 88% in September and 86% in March, contributing to a damp atmosphere. For a more detailed look at March weather, you can check out Glasgow weather in March.

September and April present distinctly different weather patterns. In September, temperatures range from a chilly 1°C (33°F) at night to a warm 27°C (80°F) during the day, with an average of 13°C (55°F). The month sees significant rainfall, totaling 91 mm (3.6 in) over about 15 days, accompanied by high humidity levels at 88%. In contrast, April experiences cooler temperatures, with nighttime lows of -3°C (26°F) and daytime highs reaching 22°C (72°F), averaging around 8°C (46°F). Precipitation is lighter, at 44 mm (1.7 in) over about 10 days, and humidity is slightly lower at 85%. For more detailed insights, you can check Glasgow weather in April.

In September, the weather generally presents a broader range of temperatures, with a minimum of 1°C (33°F) and a maximum of 27°C (80°F), resulting in an average temperature of 13°C (55°F). This month also experiences more precipitation, with 91 mm (3.6 in) over 15 days and higher humidity at 88%. In contrast, May has slightly cooler temperatures, ranging from a minimum of -1°C (31°F) to a maximum of 26°C (79°F), leading to an average temperature of 11°C (52°F). Additionally, May sees less precipitation at 67 mm (2.6 in) over 12 days, with humidity at a more comfortable 80%. For more detailed insights, you can check Glasgow weather in May.

September's weather features a broader temperature range, with lows dipping to 1°C (33°F) and highs reaching up to 27°C (80°F), averaging around 13°C (55°F). In contrast, June is generally warmer, starting with a minimum of 6°C (43°F) and peaking at 29°C (84°F), with an average of 14°C (57°F). While both months experience considerable rainfall, September sees about 91 mm (3.6 in) over 15 days, compared to June's 113 mm (4.4 in) spread across 17 days. Additionally, September's humidity is slightly higher at 88%, whereas June's humidity stands at 83%. For more specific details on June's weather patterns, you can refer to Glasgow weather in June.

In comparing the weather of July and September, it becomes clear that both months experience relatively mild temperatures. July has a slightly higher average temperature of 15°C (60°F) compared to September's 13°C (55°F), with maximum temperatures peaking at 28°C (83°F) in July against September's 27°C (80°F). However, September tends to have lower minimum temperatures, dropping to 1°C (33°F) compared to July's minimum of 6°C (43°F). Precipitation levels are comparable, with July receiving 98 mm (3.8 in) and September averaging slightly less at 91 mm (3.6 in), both spread across 15 days. Notably, September also has a higher humidity level at 88%, compared to July's 82%. For a detailed breakdown of July's weather, you can visit Glasgow weather in July.

In comparing the weather of September to August, September exhibits a slightly cooler range of temperatures, with minimums dipping down to 1°C (33°F) compared to August's 6°C (43°F). While both months share the same maximum temperature of 27°C (80°F), September's average temperature is lower at 13°C (55°F) versus August's 15°C (59°F). Additionally, September is characterized by higher humidity levels at 88%, compared to 82% in August. Precipitation is also more frequent in September, occurring on 15 days and totaling 91 mm (3.6 in), compared to August's 19 days of rain and a total of 127 mm (5.0 in). For more detailed insights, you can refer to Glasgow weather in August.

September and October present a notable transition in weather patterns. In September, temperatures range from a minimum of 1°C (33°F) to a maximum of 27°C (80°F), with an average of 13°C (55°F). The month experiences 91 mm (3.6 in) of precipitation over 15 days and is marked by high humidity at 88%. In contrast, October sees cooler temperatures, with a minimum of -3°C (28°F), an average of 10°C (50°F), and a maximum of 20°C (69°F). Rainfall increases to 130 mm (5.1 in) spread across 19 days, accompanied by slightly higher humidity at 90%. This shift underscores the onset of autumn, making October notably chillier and wetter compared to September. For more detailed information, check out Glasgow weather in October.

September and November weather exhibit significant differences, particularly in temperature and precipitation. September enjoys milder temperatures, with averages around 13°C (55°F) and highs reaching up to 27°C (80°F), while November sees a cooler average of 7°C (45°F), with maximum temperatures of only 14°C (58°F). In terms of precipitation, November experiences a slightly higher amount at 105 mm (4.1 in) over 17 days compared to September's 91 mm (3.6 in) over 15 days. Additionally, humidity levels are elevated in both months, with November showing a slightly higher percentage at 92% compared to September's 88%. For more detailed insights, check out Glasgow weather in November.

September and December in Glasgow present a notable contrast in weather conditions. September boasts milder temperatures, with averages around 13°C (55°F) and maximums reaching 27°C (80°F), offering a brief respite before the chill of winter. In contrast, December sees cooler temperatures, with averages dropping to 5°C (41°F) and nighttime lows plummeting to -6°C (21°F), ushering in the heart of winter. Along with this temperature shift, December also experiences higher precipitation, totaling 117 mm (4.6 in) over 17 days, compared to September's 91 mm (3.6 in) spread across 15 days. Humidity remains relatively high in both months, with September at 88% and December slightly higher at 89%. For more detailed weather information, check out Glasgow weather in December.

Compare Glasgow's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Glasgow

As September rolls into Glasgow, the city experiences a notable shift in weather patterns, creating a unique atmosphere that sets it apart from the summer months. While temperatures can still reach a comfortable high, the average cools down significantly, inviting layers as the chilly evenings set in. With increased humidity and a considerable amount of precipitation on half the days of the month, it’s a time when the lush landscapes of Glasgow truly come to life. This transitional month serves as a beautiful prelude to autumn, reminding us of the temperamental nature of Scottish weather. For a comprehensive look at what to expect throughout the year, check out Glasgow Climate.