September Weather in Bansko, Bulgaria

Last updated: August 21, 2025

September in Bansko, Bulgaria offers a captivating blend of mild temperatures and occasional precipitation, making it a unique time to experience this enchanting destination. With daytime highs reaching up to 28°C (83°F) and average temperatures around 14°C (57°F), visitors can enjoy the crisp mountain air. However, the month can also bring cooler nights, dipping to a brisk -3°C (27°F). Rainfall is prevalent, totaling 58 mm (2.3 in) over approximately 8 days, contributing to the lush landscapes that define the region. The average humidity sits at a comfortable 57%, ensuring that the beauty of Bansko is complemented by pleasant weather for exploration and adventure.

September Temperature in Bansko

As September unfolds in Bansko, Bulgaria, the temperatures start to transition from the warmth of summer to the crispness of autumn. With a minimum of -3°C (27°F), an average of 14°C (57°F), and a peak reaching 28°C (83°F), this month offers a delightful blend of warm days and cool nights. It marks a significant drop from the sweltering summer highs of 31°C (88°F) in July and August, hinting at the impending chill of winter. The moderate climate creates an ideal setting for outdoor activities, making it a perfect time to explore the stunning landscapes as they begin to reflect the early hues of fall. As nature prepares for the colder months ahead, September in Bansko showcases a beautiful balance between lingering warmth and the fresh, invigorating air of autumn.

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

The chart illustrates September temperature patterns in Bansko, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bansko, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec273236445358646457484032
Data source: Temperature data for Bansko 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 Bansko

September in Bansko, Bulgaria, marks a noticeable shift in precipitation patterns, with an average of 58 mm (2.3 in) of rainfall spread over 8 days. This decline follows the wetter summer months, showing a significant decrease from August's 75 mm (3.0 in) and well below the peak of June's 158 mm (6.2 in). The transition to autumn brings less frequent showers, hinting at drier conditions as the days grow shorter and cooler. This trend continues into the fall months, with October experiencing a similar precipitation amount of 75 mm (3.0 in) but with even fewer rainy days, reflecting a gradual lessening of rainfall as Bansko prepares for the winter season.

September Precipitation Trends in Bansko

The chart displays monthly precipitation patterns in Bansko, 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. In Bansko, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec847311610211715811175587578130
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bansko

As summer fades into fall, September in Bansko, Bulgaria, sees humidity levels at 57%, marking a gradual transition from the drier conditions of August, which recorded a notably low 47%. This month serves as a refreshing interlude, where humidity begins to rise again, echoing the higher levels of earlier months like January and February. With humidity levels shifting from 60% in July to this month’s 57%, September provides a more balanced atmosphere, especially compared to the peak summer months. As the seasons change, residents and visitors alike can enjoy the crispness in the air while anticipating the cozy, humid months of autumn that lie ahead.

September Average Humidity in Bansko

This chart illustrates the average monthly humidity levels in Bansko, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Bansko is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%83%81%71%74%63%60%47%57%76%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bansko

As the summer transitions into fall in Bansko, Bulgaria, the UV Index begins to taper off, yet remains notably elevated in September with a reading of 8, categorizing it as very high. This reflects a continued need for sun protection, as the burn time for unprotected skin is around 15 minutes—no time at all! While the peak of summer saw a scorching UV Index of 11 in June, September's values demonstrate that UV exposure is still significant, encouraging visitors to stay vigilant against sun damage. The gradual decline in UV levels as we approach October reminds us of the changing seasons, but for those enjoying outdoor adventures in early autumn, a good sunscreen is still a must. For more detailed information, check out the comprehensive Bansko UV Index.

Maximum UV Index Levels in Bansko for September

The chart shows the monthly maximum UV Index (UVI) for Bansko 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. In September, the maximum UV index in Bansko typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2478101110108642
Data source: Bansko 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 Bansko

September in Bansko, Bulgaria, offers a delightful transition from summer to autumn, boasting 345 hours of sunshine that invite exploration and outdoor pursuits. This month, while moderately sunny, showcases a gradual decline in daylight hours compared to the summer peak of 426 hours in July. The consistent sun from June to August provides a backdrop for adventure, yet September maintains a warm glow, ensuring that the stunning mountain landscapes are still vibrant. As the season shifts, visitors can relish the picturesque views while enjoying milder temperatures, making it an ideal time for hiking and sightseeing before the chill of October and its shortening 294 hours of sunlight. Embrace the lingering warmth and beauty of early autumn in Bansko, where the sun continues to cast a golden hue over this charming destination.

Monthly Sunshine Duration in Bansko: September Highlighted

The September sunshine duration represents the total number of hours Bansko 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.
JanFebMarAprMayJunJulAugSepOctNovDec183h239h297h341h399h400h426h399h345h294h234h225h
Data source: Bansko September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Bansko During September

In September, Bansko, Bulgaria, experiences a 50% chance of sunny weather, offering a delightful transition from the summer's warmth into the cooler autumn months. This percentage reflects a slight dip from the peak sunshine months of July and August, where the likelihood of sun reaches an impressive 70%. However, September stands out for its balanced climate, retaining a significant chance of clear skies and pleasant temperatures. Following this month, the likelihood gradually declines again in October to 47%, illustrating the shifting seasons. Visitors in September can still enjoy fair weather, making it an ideal time for outdoor activities amidst the stunning fall foliage.

Percentage of Sunny Days in September in Bansko

The chart illustrates the percentage of sunny days in Bansko 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 Bansko experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%51%47%43%44%47%70%70%50%47%30%36%
Data source: Bansko September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Bansko in September

As September unfolds in Bansko, Bulgaria, the daylight begins to gracefully wane from the sun-drenched days of summer. With 12 hours of daylight, this month serves as a transitional bridge, marking a shift towards the shorter, crisper days of autumn. The longer days of June, which enjoyed a peak of 15 hours, gradually recede, reflecting a gentle decrease through August's 13 hours before settling into September's more moderate light. This trend will continue into October, as the days shorten further, inviting the stunning fall colors and creating a picturesque backdrop for outdoor adventures. Embracing the balance of daytime and evening, September offers a beautiful respite—a perfect time for exploration before the onset of winter's chill.

Average Daylight Hours in Bansko for September

The chart illustrates the variation in daylight duration in Bansko throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 30m10h 35m11h 57m13h 21m14h 33m15h 9m14h 50m13h 47m12h 26m11h 2m9h 48m9h 10m
Data source: Bansko daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Bansko

As September arrives in Bansko, Bulgaria, a gentle breeze whispers through the mountains, with an average wind speed of 1.5 m/s (3 mph). This transition reflects a subtle decline from the summer months, where winds hovered around 1.4 m/s in August, encouraging a serene and pleasant atmosphere. The pattern of wind speeds throughout the year reveals a tendency for breezier days to return in December, when averages peak at 2.0 m/s (5 mph). In contrast, the spring and summer months typically maintain a tranquil calm, suggesting that September’s light winds offer a perfect opportunity for both relaxation and exploration in the stunning natural landscape, striking a harmonious balance before the winds pick up again with the arrival of winter.

Average September Wind Speed in Bansko

The chart displays monthly wind speed patterns in Bansko, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.91.91.81.61.81.61.51.41.5 m/s1.41.52.0
Data source: Bansko September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Bansko Compares to Other Months

Weather in Bansko varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bansko, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present strikingly different weather patterns. In September, temperatures range from a minimum of -3°C (27°F) to a pleasant average of 14°C (57°F), peaking at a warm 28°C (83°F). The month experiences around 58 mm (2.3 in) of precipitation over 8 days, with a moderate humidity of 57%. In contrast, January is much colder, with minimum temperatures plunging to -21°C (-5°F) and an average of -3°C (27°F), while the maximum temperature only reaches 10°C (51°F). This month sees increased precipitation at 84 mm (3.3 in) over 10 days and significantly higher humidity at 88%. For more details on January weather, visit Bansko weather in January.

September and February present contrasting weather conditions. In September, temperatures range from a minimum of -3°C (27°F) to a comfortable maximum of 28°C (83°F), with an average of 14°C (57°F). The precipitation during this month totals 58 mm (2.3 in), occurring over 8 days, and the humidity sits at a moderate 57%. In contrast, February experiences much colder temperatures, with a minimum of -21°C (-5°F) and a maximum of 14°C (57°F). The average temperature is at freezing point (0°C or 32°F), and it sees higher precipitation at 73 mm (2.9 in) over 10 days, accompanied by increased humidity at 83%. For more details about the weather in February, you can check Bansko weather in February.

In September, the weather is generally milder with average temperatures around 14°C (57°F) and a maximum of 28°C (83°F), making it quite pleasant for outdoor activities. In contrast, March is much colder, with average temperatures only reaching 2°C (36°F) and lows dipping to -21°C (-5°F), presenting a stark difference in climate. Precipitation is also notably higher in March, totaling 116 mm (4.6 in) over 14 days, compared to September's 58 mm (2.3 in) over 8 days. Additionally, March experiences higher humidity levels at 81%, compared to September's 57%. For a more detailed look at March conditions, you can check Bansko weather in March.

September and April present contrasting weather conditions. In September, temperatures range from a chilly -3°C (27°F) at night to a warm 28°C (83°F) during the day, with an average of 14°C (57°F). This month experiences relatively low precipitation, averaging 58 mm (2.3 in) over about 8 days, and a moderate humidity of 57%. In contrast, April sees cooler temperatures with a minimum of -7°C (19°F) and a maximum of 21°C (71°F), averaging only 7°C (44°F). This month is wetter, with 102 mm (4.0 in) of rain spread over approximately 14 days, and higher humidity levels at 71%. For more details on April weather, visit Bansko weather in April.

In comparing the weather of September and May, we observe notable differences in temperature and precipitation patterns. September boasts a wider temperature range, with minimums dipping to -3°C (27°F) and maximums reaching 28°C (83°F). The average temperature hovers around a comfortable 14°C (57°F), and with only 58 mm (2.3 in) of precipitation over about 8 days, the humidity remains relatively moderate at 57%.

In contrast, May experiences slightly cooler temperatures, with minimums at -2°C (29°F) and maximums around 25°C (77°F), resulting in an average of 11°C (53°F). However, it is significantly wetter, receiving 117 mm (4.6 in) of rain over 19 days, leading to a higher humidity level of 74%. This increased precipitation and humidity often create a lush, green landscape. For more insights on May weather, you can check this link: Bansko weather in May.

In comparing the weather of September and June, September tends to be milder, with average temperatures ranging from a minimum of -3°C (27°F) to a maximum of 28°C (83°F), while June offers slightly warmer conditions, with temperatures averaging between 2°C (35°F) and 29°C (85°F). However, June is characterized by significantly higher precipitation, accumulating 158 mm (6.2 in) over 19 days, compared to September's 58 mm (2.3 in) over just 8 days. Additionally, humidity levels in June are a bit higher at 63%, compared to 57% in September. For more detailed insights into June weather, you can check Bansko weather in June.

In comparing the weather of September and July, September tends to be cooler, with average temperatures ranging from a minimum of -3°C (27°F) to a maximum of 28°C (83°F), while July enjoys warmer averages between 6°C (44°F) and 31°C (88°F). Precipitation in September is lower, at 58 mm (2.3 in) over about 8 days, compared to July's significant 111 mm (4.4 in) falling over 14 days. Additionally, September has slightly lower humidity levels at 57%, compared to July's 60%. For more details, you can check Bansko weather in July.

In comparing the weather in September to that of August, September shows a marked drop in average temperature, with a minimum of -3°C (27°F) and a maximum of 28°C (83°F), whereas August experienced a milder minimum of 4°C (40°F) and a peak of 31°C (88°F). Furthermore, September sees slightly higher humidity levels at 57%, in contrast to August's 47%. While precipitation in September totals 58 mm (2.3 in) over 8 days, August had more rainfall at 75 mm (3.0 in) over 10 days. For a detailed look at the weather patterns in August, you can visit Bansko weather in August.

September and October present notable shifts in weather conditions as autumn progresses. In September, temperatures range from a chilly minimum of -3°C (27°F) to a comfortable maximum of 28°C (83°F), with an average of 14°C (57°F). The month sees about 58 mm (2.3 in) of precipitation over 8 days, accompanied by a moderate humidity level of 57%. In contrast, October brings a cooler atmosphere, with minimum temperatures dropping to -4°C (25°F) and a lower average of 9°C (48°F), peaking at 22°C (72°F). Precipitation increases to 75 mm (3.0 in) across 7 days, and humidity rises significantly to 76%. For a more detailed look at October's weather, visit Bansko weather in October.

In September, the weather offers a comfortable temperature range, with a minimum of -3°C (27°F) and a maximum of 28°C (83°F), resulting in an average temperature of 14°C (57°F). The month sees relatively mild conditions, with 58 mm (2.3 in) of precipitation over 8 days, and a humidity level of 57%. In contrast, November brings a noticeable chill, with temperatures dropping to a minimum of -13°C (9°F) and peaking at 20°C (68°F), averaging just 4°C (40°F). This month experiences increased precipitation, totaling 78 mm (3.1 in) across 9 days, along with a higher humidity of 85%. For more detailed insights, check out Bansko weather in November.

September and December present markedly different weather conditions. In September, the temperatures range from a minimum of -3°C (27°F) to a maximum of 28°C (83°F), with an average of 14°C (57°F), offering a pleasant late summer feel. The month sees moderate rainfall of 58 mm (2.3 in) across about 8 days, with humidity hovering around 57%. In contrast, December brings colder temperatures, with a minimum of -15°C (6°F), an average of 0°C (32°F), and a maximum of 11°C (51°F). It also experiences significantly higher precipitation at 129 mm (5.1 in) over 12 days and increased humidity at 87%. For more details on December weather, you can visit Bansko weather in December.

Compare Bansko's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Bansko

September in Bansko sets itself apart from the summer months with a noticeable shift in temperatures and a more refreshing atmosphere. As the warm days gradually give way to cooler nights, visitors can expect temperatures to range from pleasantly warm to brisk, with average highs making it ideal for outdoor activities. The increased chance of precipitation, along with moderate humidity, adds a layer of freshness to the air, making this month a transition into autumn. Whether you're hiking in the mountains or exploring the quaint town, September offers a unique blend of lingering warmth and the early embrace of fall. For more detailed insights, check out Bansko Climate.