September Weather in Kyustendil, Bulgaria

Last updated: August 21, 2025

Experience the September weather in Kyustendil, Bulgaria, where temperatures exhibit a notable range, reaching a maximum of 33°C (91°F) during the day and dipping to a cool minimum of 0°C (32°F) at night. The average temperature settles around a comfortable 17°C (63°F), perfect for outdoor explorations. Expect a modest precipitation total of 36 mm (1.4 in) over about 5 days, accompanied by a humidity level of 59% that adds a subtle warmth to the air. Embrace the transitional charm of September in this picturesque town, where summer warmth gracefully yields to the crispness of autumn.

September Temperature in Kyustendil

In September, Kyustendil experiences a delightful transition as summer moves toward autumn. With temperatures ranging from a crisp 0°C (32°F) at night to a comfortable 33°C (91°F) during the day, this month offers a perfect blend of warmth and coolness. The average temperature settles at a pleasant 17°C (63°F), making it an ideal time for outdoor activities and exploration. As the days gradually shorten, the mild climate allows for lingering evenings, inviting locals and visitors alike to bask in the lingering warmth of summer while savoring the fresh, invigorating air that hints at the approaching fall. This transitional month is a beautiful reminder of nature's rhythms, showcasing Kyustendil's enchanting charm.

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

The chart illustrates September temperature patterns in Kyustendil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kyustendil, 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).
JanFebMarAprMayJunJulAugSepOctNovDec323842505865707163524436
Data source: Temperature data for Kyustendil 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 Kyustendil

In September, Kyustendil experiences a gentle transition toward autumn, characterized by a relatively modest precipitation of 36 mm (1.4 in) across just 5 days. This marks a continuation of the drier trend observed from the previous months, particularly following the significant rainfall in June and the gradual decrease in August. The rainfall during September is noticeably less than the summer peak, reflecting a shift as the region prepares for a cooler season. With soft drizzles rather than heavy downpours, the month is gentle, making it a perfect time to enjoy the autumnal beauty while the landscapes are still vibrant from the summer. As October approaches, a slight uptick in precipitation can be expected, signaling the gradual return of more consistent autumn rains.

September Precipitation Trends in Kyustendil

The chart displays monthly precipitation patterns in Kyustendil, 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 Kyustendil, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec635183666898733536534792
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kyustendil

In September, Kyustendil experiences a noticeable shift in humidity as it transitions from the hotter summer months to the cooler autumn period. With an average humidity level of 59%, September marks a refreshing dip from the previous month’s 50%, suggesting the onset of early autumn and a welcome respite from the summer heat. This moderate humidity level introduces a more comfortable climate, paving the way for crisp fall days, particularly when compared to October's return to higher humidity at 79%. As autumn unfolds, one can expect the air in Kyustendil to become increasingly rich and invigorating, reflecting the natural rhythm of the seasons.

September Average Humidity in Kyustendil

This chart illustrates the average monthly humidity levels in Kyustendil, 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 Kyustendil is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%85%83%71%73%67%68%50%59%79%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kyustendil

In September, Kyustendil experiences a notable shift in the UV Index, providing a peak of 7 in the “high” exposure category. As summer's intensity wanes, the burn time extends back to 25 minutes, allowing for more comfortable outdoor activity without the immediate risk of skin damage. Compared to the blistering highs of July and August, where the UV Index hovered at 10, September's milder rays still require caution. This transition marks the beginning of a gradual decline into lower UV levels, as the UV Index falls to 6 in October. For those planning to bask in the late summer sun, it remains crucial to stay informed about UV levels and take necessary precautions. For detailed insights on UV conditions throughout the year, visit Kyustendil UV Index.

Maximum UV Index Levels in Kyustendil for September

The chart shows the monthly maximum UV Index (UVI) for Kyustendil 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 Kyustendil typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24789101097632
Data source: Kyustendil 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 Kyustendil

As summer gracefully transitions into autumn, September in Kyustendil continues to bask in 342 hours of sunlight, marking a delightful shift from the intensity of July and August. This month witnesses a gradual decline in daylight, yet it still offers ample sunshine for outdoor activities and enjoying the vibrant fall foliage. Following a peak in July, the hours of sunlight subtly taper off, embodying the serene essence of early autumn while still delivering plenty of golden rays. This stunning balance creates an enchanting backdrop for those looking to relish the lingering warmth before the cooler October days settle in.

Monthly Sunshine Duration in Kyustendil: September Highlighted

The September sunshine duration represents the total number of hours Kyustendil 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.
JanFebMarAprMayJunJulAugSepOctNovDec174h238h288h337h395h392h422h399h342h290h236h205h
Data source: Kyustendil September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Kyustendil During September

As summer transitions into autumn, September in Kyustendil, Bulgaria, boasts a respectable 54% chance of sunny weather. This figure reflects a notable dip from the preceding months, where June and July reach a peak of 51% and 73% respectively, followed by August at a vibrant 77%. Despite this decrease, September retains a better-than-average prospect for sunshine compared to earlier spring months, with averages lingering around 45% to 50%. As the days grow shorter, those seeking bright spots in the early fall will find September a delightful time to enjoy the outdoors before winter sets in.

Percentage of Sunny Days in September in Kyustendil

The chart illustrates the percentage of sunny days in Kyustendil 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 Kyustendil experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%53%50%45%47%51%73%77%54%49%33%35%
Data source: Kyustendil September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Kyustendil in September

In Kyustendil, Bulgaria, September marks the transition from the long, sun-drenched days of summer to the shorter daylight hours of autumn. As daylight dips to 12 hours, nature begins to shift dramatically. This month showcases a noticeable decrease compared to the 15 hours of sunlight enjoyed in June, yet it remains significantly brighter than the encroaching winter months ahead. From 9 hours in January to a peak of 14 hours in May, the gradual ebb and flow of daylight reflects the changes in season, making September a delightful bridge between the energy of summer and the calm of autumn. With each setting sun, the vivid colors of early fall make up for the diminished daylight, inviting both locals and visitors to savor the beauty of the changing landscape.

Average Daylight Hours in Kyustendil for September

The chart illustrates the variation in daylight duration in Kyustendil throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 28m10h 33m11h 57m13h 22m14h 35m15h 12m14h 52m13h 48m12h 26m11h 1m9h 46m9h 7m
Data source: Kyustendil daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Kyustendil

As September unfolds in Kyustendil, Bulgaria, the air is marked by a gentle breeze, with average wind speeds stabilizing at 1.6 m/s (4 mph). This calmness mirrors the transition from the heat of summer to the coolness of autumn, showcasing a notable trend of decreasing wind speeds from the lively gusts of earlier months. To put this in perspective, July and June had a slightly stronger breath of wind at 1.5 m/s (3 mph), while the spring months started on a high note with winds at 2.1 m/s (5 mph). Reflecting this seasonal ebb, September's mild weather invites residents and visitors alike to enjoy the beauty of the changing landscapes, as the breezes increase in tenderness, setting the stage for the crisp days ahead.

Average September Wind Speed in Kyustendil

The chart displays monthly wind speed patterns in Kyustendil, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.12.12.11.81.91.51.51.61.6 m/s1.61.81.9
Data source: Kyustendil September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Kyustendil Compares to Other Months

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

In September, the weather in Kyustendil is characterized by a more temperate climate, with temperatures ranging from a chilly 0°C (32°F) to a warm 33°C (91°F) and an average of 17°C (63°F). The month sees about 36 mm (1.4 in) of precipitation over approximately 5 days, accompanied by a humidity level of 59%. In stark contrast, January experiences much harsher conditions, with temperatures plummeting to a minimum of -25°C (-13°F) and peaking at just 13°C (56°F), averaging around 0°C (32°F). The winter month is wetter too, with 63 mm (2.5 in) of precipitation spread over 9 days and significantly higher humidity at 89%. For more details on January weather, visit Kyustendil weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures can swing from a chilly 0°C (32°F) at night to a warm max of 33°C (91°F) during the day, with an average of 17°C (63°F). This month sees a relatively modest precipitation of 36 mm (1.4 in) over about 5 days, accompanied by a comfortable humidity of 59%. In contrast, February brings much colder temperatures, with lows dipping to -20°C (-4°F) and an average of just 3°C (38°F), reaching a maximum of 18°C (65°F). Precipitation increases to 51 mm (2.0 in) across 9 days, and humidity rises significantly to 85%. This highlights how February's weather tends to be more frigid and wetter compared to the warm and drier conditions of September. For more details on February's weather, you can refer to Kyustendil weather in February.

In comparing the weather of September and March, a stark contrast emerges. September enjoys a mild climate with temperatures ranging from a chilly 0°C (32°F) at night to a warm 33°C (91°F) during the day, accompanied by moderate precipitation of 36 mm (1.4 in) over approximately five days. In contrast, March experiences much colder temperatures, with lows plunging to -18°C (-1°F) and highs reaching only 23°C (73°F). The month is notably wetter, receiving 83 mm (3.3 in) of rainfall over 12 days, and boasts a higher humidity level of 83%. For more details, you can find additional information here: Kyustendil weather in March.

In comparing the weather of September to that of April, notable differences emerge. September showcases a wider temperature range, with minimums of 0°C (32°F) and maximums reaching up to 33°C (91°F), averaging a comfortable 17°C (63°F). In contrast, April starts off chillier, with minimum temperatures dropping as low as -5°C (23°F) and a milder maximum of 26°C (79°F), averaging around 10°C (50°F).

Precipitation levels are also distinct, with September receiving 36 mm (1.4 in) over about 5 days, while April experiences heavier rainfall at 66 mm (2.6 in) over 11 days, contributing to its higher humidity of 71%. For a more detailed look at April weather, you can check Kyustendil weather in April.

September and May present contrasting weather conditions in terms of temperature and precipitation. In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 33°C (91°F), with an average of 17°C (63°F), while May sees cooler temperatures, with a minimum of 0°C (32°F), an average of 15°C (59°F), and a maximum of 29°C (85°F). Precipitation in September amounts to 36 mm (1.4 in) over just 5 days, making it relatively drier compared to May, which experiences 68 mm (2.7 in) spread across 14 days. Additionally, humidity levels are higher in May at 73%, compared to 59% in September. For a closer look at May's conditions, you can visit Kyustendil weather in May.

When comparing the weather in September and June, both months share a maximum temperature similarity of 33°C (91°F), making them equally warm on the hottest days. However, September experiences a wider temperature range with minimums dropping to 0°C (32°F), while June maintains a milder minimum of 5°C (40°F). Precipitation levels also vary significantly between the two months; June sees considerably more rain, with 97 mm (3.8 in) over 17 days, compared to September's 36 mm (1.4 in) across just 5 days. Furthermore, June tends to be more humid, averaging 67% humidity compared to September's 59%. For a closer look at June's weather specifics, check out Kyustendil weather in June.

In comparing the weather of September and July, September offers a wider temperature range with a minimum of 0°C (32°F) and a maximum of 33°C (91°F), while July typically experiences milder nights with a minimum of 9°C (49°F) and hotter days peaking at 35°C (96°F). July also brings more humidity at 68% compared to September's 59%. Additionally, rainfall is more frequent in July, with 12 days of precipitation totaling 73 mm (2.9 in), while September sees less rain—only 36 mm (1.4 in) over 5 days. For a detailed look at July's weather, you can visit Kyustendil weather in July.

In comparing the weather between September and August, September tends to be cooler overall, with average temperatures ranging from a minimum of 0°C (32°F) to a maximum of 33°C (91°F), while August experiences higher averages, between 9°C (48°F) and 35°C (96°F). Precipitation levels are similar, with September receiving 36 mm (1.4 in) over 5 days, compared to August's 35 mm (1.4 in) over 7 days. Notably, humidity is slightly higher in September at 59%, compared to 50% in August. For a detailed look at August's weather specifically, you can refer to Kyustendil weather in August.

In September, temperatures range from a minimum of 0°C (32°F) to a maximum of 33°C (91°F), with an average of 17°C (63°F). The month experiences relatively low precipitation, totaling 36 mm (1.4 in) across 5 days, and a moderate humidity level of 59%. In contrast, October brings cooler weather, with temperatures dropping to a minimum of -3°C (28°F) and averaging 11°C (52°F), while peaking at a maximum of 27°C (81°F). Precipitation increases to 53 mm (2.1 in) over 6 days, and humidity also rises to 79%. For more details, you can check Kyustendil weather in October.

In comparing September and November weather, we see a notable shift in temperatures and conditions. September typically boasts a warm average of 17°C (63°F), with highs reaching up to 33°C (91°F) and only 36 mm of precipitation over about 5 days, making it relatively dry and pleasant. In contrast, November experiences a significant drop in temperatures, with an average of just 7°C (44°F) and a minimum that can fall to -12°C (10°F). Additionally, November is wetter, receiving 47 mm of rain over approximately 7 days, and it also has a higher humidity level at 87%. For a closer look at the specific conditions in November, you can view more details here: Kyustendil weather in November.

The weather in September and December presents a stark contrast, with September enjoying significantly warmer temperatures. In September, the minimum temperature hovers around 0°C (32°F) and averages a comfortable 17°C (63°F), reaching a maximum of 33°C (91°F). Humidity is relatively moderate at 59%, and rainfall is light, totaling 36 mm (1.4 in) over about 5 days. In contrast, December temperatures plunge, with a minimum of -12°C (11°F) and an average of just 2°C (37°F), peaking at 13°C (55°F). The month also sees increased precipitation, totaling 92 mm (3.6 in) over 11 days, and higher humidity levels at 89%. For more detailed insights, you can visit Kyustendil weather in December.

Compare Kyustendil's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Kyustendil

September in Kyustendil marks a transition from the hot summer months to the crisp beginnings of autumn. With its pleasant average temperatures and diminishing heat, this month offers a refreshing respite from the sweltering highs often experienced in July and August. As the humidity levels remain moderate, the air feels comfortable, making it an ideal time for outdoor activities. Compared to the wetter spring months, September's limited precipitation enhances the allure of the sunny days, inviting both locals and visitors to explore. For a deeper understanding of this region's climate throughout the year, check out Kyustendil Climate.