Last updated: August 27, 2025
September in Cluj-Napoca, Romania offers a captivating blend of late summer warmth and the crisp onset of autumn. With daytime temperatures peaking at a maximum of 29°C (85°F), the month radiates a sense of lingering warmth, while the average settles at a comfortable 15°C (59°F). However, nights can be quite chilly, dipping to a minimum of -1°C (31°F). The city experiences approximately 59 mm (2.3 in) of rainfall over 8 days, contributing to a humidity level of 64%, creating a refreshing atmosphere. Whether you're strolling through its historic streets or exploring the surrounding nature, September's weather in Cluj-Napoca is both dynamic and inviting.
In September, Cluj-Napoca experiences a gentle shift towards autumn, characterized by a notable temperature range. With morning lows dipping to -1°C (31°F) and afternoon highs peaking at a pleasant 29°C (85°F), the month begins with a warm embrace before gradually cooling down. The average temperature hovers around a comfortable 15°C (59°F), providing ideal conditions for exploring the city's vibrant culture and stunning landscapes. This transitional month sets the stage for the crisp days of October, as the warmth of summer gradually yields to the coolness of the approaching fall, making September a delightful time to visit Cluj-Napoca.
September in Cluj-Napoca brings an average precipitation of 59 mm (2.3 in), marking a transition as the summer heat begins to wane. This month experiences about 8 days of rainfall, which is notably lower than the wetter months of May through July, yet it still contributes to the overall autumnal ambiance. The rainfall is moderate compared to both preceding and following months, crafting a balance that nurtures the region’s greenery without overwhelming it. As the city shifts away from the vibrant summer showers, September sets the stage for the cooler, drier days of autumn, with precipitation levels gently tapering off as the year progresses.
As the summer fades into autumn, September in Cluj-Napoca brings a noticeable shift in humidity, settling at 64%. This marks a moderate increase from the dry, warmer months of July and August, when humidity dipped to 64% and 55%, respectively. However, it remains significantly lower than the winter months, where levels soar above 80%. The transition into fall signals a gradual uptick in moisture, foreshadowing the return of the more humid conditions typical of the upcoming colder months. This gradual rebalancing provides a refreshing change for residents and visitors alike, balancing the lingering warmth of summer with the crispness that autumn brings.
In September, Cluj-Napoca experiences a UV Index of 7, placing it in the high exposure category with a burn time of 25 minutes. As summer wanes, the intensity of UV radiation begins to decline from the peak levels seen in July and August, which boasted indices of 9. This gradual decrease offers a more forgiving sun, yet caution is still warranted, especially for those spending extended periods outdoors. Comparatively, the UV Index shifts from the very high levels of the summer months to a moderately intense autumn, making September a transitional period where sun protection remains important. For more detailed information on UV levels throughout the year, visit Cluj-Napoca UV Index.
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As summer gradually gives way to autumn, September in Cluj-Napoca, Romania continues to bask in a pleasant glow, boasting 339 hours of sunshine. This month marks a notable decline from the peak summer months, where June and July enjoyed over 400 hours, yet it still outshines the earlier part of the year. The gradual transition is evident as the city's vibrant charm blends with the crispness of fall, inviting residents and visitors alike to relish the golden days before the cooler months set in. While the sun shines a bit less than in August, the warmth of September remains a cherished bridge between the abundance of summer and the quieter tones of October. As daylight dims, the city takes on a new character, painted in hues of vibrant autumn, making it a captivating time to explore Cluj-Napoca.
In September, Cluj-Napoca enjoys a notable 48% chance of sunny weather, making it one of the more favorable months for sunshine as summer transitions into autumn. This figure is slightly lower than the height of summer in July and August, which boast chances around 50-52%, yet it still indicates a significant likelihood of clear skies. As the year progresses, the trend reveals a gradual increase in sunny days from the dreary depths of winter, peaking during the warmer months. Given September's relatively high chance of sun and the pleasant temperatures that accompany it, this month presents an ideal opportunity to bask in the beauty of the season before the colder months set in.
As summer gives way to autumn in Cluj-Napoca, September experiences a gentle decline in daylight hours, offering approximately 12 hours of daylight. This marks a noticeable shift from the sun-soaked days of June through August, when daylight peaked at 15 hours. As nature begins its transition, the shortening days reflect a gradual farewell to summer's embrace, yet still provide ample time for enjoying the vibrant hues of early autumn. Following September, daylight hours will continue to dwindle, leading into the cooler months of October and November.
As September sweeps through Cluj-Napoca, the gentle embrace of the wind offers a soothing change from the sweltering summer days. With an average wind speed of 2.0 m/s (5 mph), it marks a subtle transition that mirrors the shifting seasons. This modest breeze is consistent with the lighter winds experienced during the summer months, yet it hints at the crispness of autumn just around the corner. Following a pattern of slight fluctuations, September's winds align closely with those of June and July, providing a sense of continuity even as the temperatures begin to cool. As the month progresses, visitors and locals alike can relish the refreshing gusts, making it an ideal time to explore the vibrant streets and picturesque parks of this enchanting Romanian city.
Weather in Cluj-Napoca varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Cluj-Napoca, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Cluj-Napoca present a striking contrast in weather conditions. September typically enjoys milder temperatures, with minimums around -1°C (31°F) and averages of 15°C (59°F), peaking at 29°C (85°F). In contrast, January brings frigid temperatures, with lows reaching -21°C (-6°F) and average highs of only -3°C (28°F). While September experiences 59 mm (2.3 in) of precipitation over about 8 days and a humidity level of 64%, January sees less precipitation at 34 mm (1.3 in) over 9 days, but a much higher humidity of 93%. For a detailed overview of January weather conditions in Cluj-Napoca, you can visit Cluj-Napoca weather in January.
September and February present contrasting weather conditions. In September, the temperatures range from a chilly minimum of -1°C (31°F) to an average of 15°C (59°F), peaking at a warm 29°C (85°F), making it a month of significant warmth and occasional rain, with 59 mm (2.3 in) of precipitation over 8 days and a humidity of 64%. In contrast, February is relatively cold, with minimum temperatures dropping to -14°C (8°F) and an average of only 1°C (34°F). The maximum in February reaches just 16°C (61°F), along with slightly lower precipitation of 49 mm (1.9 in) but more rainy days, totaling 11. The humidity is notably higher at 88%. For more details, you can check Cluj-Napoca weather in February.
In comparing the weather of September and March, we observe significant differences in temperature and humidity. September enjoys milder conditions, with an average temperature of 15°C (59°F) and a maximum reaching up to 29°C (85°F), while March experiences much colder averages of just 4°C (39°F), with highs around 22°C (72°F) and lows plummeting to -19°C (-1°F). Precipitation levels are similar, with September receiving 59 mm (2.3 in) over 8 days and March slightly less at 56 mm (2.2 in) across 11 days, suggesting that March is slightly wetter but spread over more days. Additionally, March is characterized by higher humidity at 86%, compared to September’s 64%. For a detailed glimpse into March weather patterns, you can check Cluj-Napoca weather in March.
When comparing the weather in September and April, there are notable differences in temperature and humidity levels. September typically enjoys milder temperatures, with an average of 15°C (59°F) and highs reaching up to 29°C (85°F), while April is cooler, averaging 9°C (48°F) and peaking at 26°C (80°F). Precipitation levels are relatively similar, with September receiving 59 mm (2.3 in) over 8 days, and April experiencing 52 mm (2.0 in) across 12 days. Additionally, the humidity is higher in April, at 79%, compared to September's 64%. For a closer look at what to expect during April, visit Cluj-Napoca weather in April.
Comparing the weather in September and May reveals some interesting differences. In September, temperatures range from a minimum of -1°C (31°F) to a maximum of 29°C (85°F), with an average of 15°C (59°F). The month has relatively lower precipitation at 59 mm (2.3 in) over 8 days, and humidity sits at 64%. In contrast, May experiences a similar minimum temperature of -1°C (30°F) but has a slightly lower average temperature of 14°C (57°F) and a maximum of 27°C (81°F). However, May is much wetter, with precipitation totaling 115 mm (4.5 in) over 19 days, resulting in higher humidity levels at 71%. This makes May a noticeably more humid and rainy month compared to the generally drier September. For a more detailed look at May weather, you can visit Cluj-Napoca weather in May.
When comparing the weather in September and June, notable differences emerge. In June, temperatures range from a minimum of 6°C (42°F) to a maximum of 32°C (90°F), with an average temperature of 18°C (65°F). This month also experiences higher precipitation levels, averaging 110 mm (4.3 in) over 18 days, contributing to a humidity level of 71%. In contrast, September sees a broader temperature range from -1°C (31°F) to 29°C (85°F), with an average of 15°C (59°F). It has lower precipitation at 59 mm (2.3 in) across 8 days and a humidity of 64%. For more detailed insights, check out Cluj-Napoca weather in June.
When comparing the weather in July and September, notable differences emerge in both temperature and precipitation. In September, temperatures can drop significantly, with a minimum of -1°C (31°F) compared to July’s warmer minimum of 7°C (45°F). The average temperature in September is about 15°C (59°F), while July boasts a warmer average of 19°C (67°F). Furthermore, July experiences higher maximum temperatures, reaching up to 32°C (89°F), unlike September's peak of 29°C (85°F). Precipitation also differs, with September receiving 59 mm (2.3 in) over 8 days, while July sees more rain at 100 mm (3.9 in) across 16 days. Interestingly, both months share the same humidity level of 64%. For more details, visit Cluj-Napoca weather in July.
In comparing the weather between August and September, a noticeable shift in temperature and humidity can be observed. September experiences a wider temperature range with minimums dropping to -1°C (31°F) and maximums reaching 29°C (85°F), averaging around 15°C (59°F). In contrast, August offers warmer temperatures, with minimums at 6°C (43°F) and maximums soaring up to 35°C (95°F), maintaining an average of 20°C (68°F). Additionally, September sees slightly less precipitation at 59 mm (2.3 in) over 8 days, compared to August's 74 mm (2.9 in) over 11 days. Humidity levels are also higher in September at 64%, compared to August’s 55%. For a more detailed look at the conditions in August, check out Cluj-Napoca weather in August.
In September, the weather is more varied, with temperatures ranging from a minimum of -1°C (31°F) to a warm maximum of 29°C (85°F), averaging around 15°C (59°F). The month sees about 59 mm (2.3 in) of precipitation over 8 days, and the humidity level stands at 64%. In contrast, October brings cooler temperatures, with a minimum of -4°C (25°F) and a mild maximum of 24°C (76°F), averaging 10°C (50°F). Precipitation slightly decreases to 53 mm (2.1 in) over 7 days, but the humidity rises notably to 83%. This shift marks a transition to a more consistently cool and damp climate. For more details, visit Cluj-Napoca weather in October.
September and November present a stark contrast in weather conditions. In September, temperatures vary more widely, with lows around -1°C (31°F) and highs reaching up to 29°C (85°F), leading to an average of 15°C (59°F). The month experiences 59 mm (2.3 in) of precipitation over 8 days and maintains a humidity level of 64%. In comparison, November sees a drop in temperatures, with minimums of -8°C (19°F) and a maximum of 22°C (73°F), resulting in a cooler average of 5°C (41°F). Precipitation decreases to 41 mm (1.6 in) over 9 days, but humidity rises significantly to 91%. For a more detailed look at November's climate, visit Cluj-Napoca weather in November.
In September, Cluj-Napoca experiences a much warmer climate with average temperatures around 15°C (59°F), reaching highs of 29°C (85°F), while December sees a significant drop, with average temperatures at 0°C (33°F) and a maximum of only 12°C (54°F). The humidity in September is relatively moderate at 64%, compared to the much higher humidity of 92% in December. Additionally, while September receives about 59 mm (2.3 in) of precipitation over 8 days, December has slightly more at 65 mm (2.6 in) across 13 days, indicating a wetter and chillier month. For more details on December weather, visit Cluj-Napoca weather in December.
As summer gracefully transitions into autumn, September in Cluj-Napoca unveils a character quite distinct from the preceding months. The warmth still lingers, with maximum temperatures peaking at a pleasant 29°C, but as the days shorten, a cooler breeze introduces an average chill of 15°C. This month sees a blend of sun and occasional rain, with about eight days of precipitation, adding up to 59 mm. The humidity hovers around 64%, reminding locals and visitors alike that the season of change is upon them. For a deeper dive into the weather patterns of this enchanting city, explore the Cluj-Napoca Climate.