Last updated: August 27, 2025
In Bucharest, Romania, September experiences a vibrant transition from summer warmth to early autumn chill. The maximum temperature can soar to 36°C (97°F), offering sun-soaked days, while the average temperature settles around a comfortable 20°C (68°F). As the month progresses, nighttime temperatures can dip to a cool 1°C (35°F), prompting a shift in wardrobe. Rainfall is minimal, with an average of 23 mm (0.9 in) over just 3 days, allowing for plenty of outdoor activities. With a humidity level of 57%, the air remains pleasantly mild, making September an inviting time to explore the dynamic capital city.
As September unfolds in Bucharest, the city experiences a remarkable shift in temperatures, striking a balance between the lingering warmth of summer and the crispness of autumn. With minimums settling around 1°C (35°F) and averages at a comfortable 20°C (68°F), the days remain pleasantly warm, peaking at a sizzling 36°C (97°F). This transitional month signifies a notable decline from the sweltering highs of August, while still offering ample sunshine for outdoor adventures. As the leaves begin to change color, September in Bucharest invites residents and visitors alike to enjoy the majestic beauty of the city under a fluctuating yet generally mild climate, marking the perfect time to explore its vibrant parks and historic streets.
In September, Bucharest experiences a noticeable shift in precipitation patterns, with only 23 mm (0.9 in) of rainfall spread over just 3 days. This marks a significant drop compared to the summer months, where heavy rains in June and July contributed to higher totals of 115 mm (4.5 in) and 90 mm (3.5 in) respectively. The tapering off of rainfall serves as a gentle transition from the vibrant, often stormy summer days to the drier spells ahead in autumn. It's a time when the city begins to feel the crispness of fall, offering a reprieve from the humid heat while signaling a decrease in overall precipitation.
September in Bucharest, Romania, marks a notable shift in humidity as the summer heat begins to wane, with levels reaching 57%. This slight increase from the extremely dry conditions of August, which saw humidity drop to 48%, indicates a transition toward the more humid fall months. As the year progresses, humidity starts to rise again, peaking in November at 87% and December at 88%, reminiscent of the early winter months. The gradual increase seen from mid-summer through to early autumn highlights Bucharest's climate patterns, where the air tends to feel heavier as temperatures cool, preparing for the moist embrace of the upcoming winter.
As summer transitions into autumn, the UV Index in Bucharest experiences a notable decline, reflecting a shift in sun exposure. In September, it holds a high UV Index of 7, demanding caution during outdoor activities with a burn time of 25 minutes. While this is a decrease from the peak very high levels of 8 and 9 seen in the previous months, it still necessitates protective measures to safeguard skin health. The trends reveal a gradual tapering off of UV intensity, as the city moves towards the milder indices of autumn, yet September remains a month to be mindful of the sun's rays. For more detailed information, visit Bucharest UV Index.
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As summer gracefully transitions into autumn, September in Bucharest continues to bask in the warmth of the sun, offering an impressive 343 hours of bright sunshine. This month reflects a noticeable shift as daylight begins to wane, yet it still holds onto the vibrant energy of late summer, falling just behind the sunniest months of July and August. In fact, after reaching a peak of 425 hours in July, the sunshine hours gently decline, marking a significant yet pleasant retreat into the cozy embrace of fall. This trend not only highlights the lingering warmth of early autumn but also sets the stage for the cooler days of October, making September a delightful time to enjoy outdoor activities while the sun still shines brightly over the charming streets of Bucharest.
September in Bucharest welcomes a brighter shift in weather, boasting a 59% chance of sunny days. As summer wanes, this month captures the essence of transition with a significant increase in sunshine compared to the early months of the year. The rising trend is evident as we move from July and August, which enjoy a robust 70% sunshine probability, to September's inviting warmth. Following a series of months filled with diminishing sunshine, September stands out as a golden opportunity to enjoy the lingering summer vibes before autumn sets in. While the likelihood of sun may notably drop in October, September remains a charming blend of warmth and brightness, perfect for outdoor activities and exploring the city's vibrant culture.
As summer gracefully transitions into autumn, September in Bucharest offers a delightful balance with approximately 12 hours of daylight. This month marks a gentle decline from the peak sunlight of July and June, which basked in 15 hours of sunshine each day. Falling slightly from the preceding month of August, September serves as a charming bridge to shorter days, reminding residents of the seasonal shift ahead. As daylight diminishes, the city's vibrant energy transforms, setting the stage for the cozy ambiance of fall. The descent from the warm glow of summer to the softer hues of autumn highlights nature's breathtaking transitions, making September a truly enchanting month in Romania's capital.
As September unfolds in Bucharest, the city experiences a gentle breeze with an average wind speed of 2.6 m/s (6 mph), reminiscent of the transitioning seasons. This marks a slight uptick from the calmer summer months, where wind speeds dipped to around 2.0-2.4 m/s. The approaching autumn heralds a change, hinting at the invigorating winds of October that will soon return to 3.0 m/s. Overall, September's winds signify a subtle shift from the heat of summer, providing a refreshing backdrop as residents and visitors alike enjoy the city's vibrant atmosphere and the beginnings of fall's embrace.
Weather in Bucharest varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bucharest, focusing on differences in temperature, rainfall, humidity, and UV levels.
In Bucharest, September exhibits a much warmer climate compared to January, with temperatures ranging from a minimum of 1°C (35°F) to a maximum of 36°C (97°F) and an average of 20°C (68°F). In contrast, January's temperatures drop significantly, with a minimum of -23°C (-9°F) and a maximum of 15°C (59°F), averaging around 0°C (32°F). While September sees relatively low precipitation of 23 mm (0.9 in) over just 3 days, January experiences a more humid atmosphere, with 40 mm (1.6 in) of precipitation over 7 days and a humidity level of 88%. For more details, you can check Bucharest weather in January.
September and February present strikingly different weather patterns. In September, temperatures can vary from a crisp 1°C (35°F) at night to a warm average of 20°C (68°F) during the day, peaking at a high of 36°C (97°F). With minimal precipitation of 23 mm (0.9 in) over just 3 days and a humidity level of 57%, September generally offers a pleasant and comfortable climate. In contrast, February is much colder, with temperatures dropping to a minimum of -14°C (6°F) and an average of only 3°C (37°F), reaching a maximum of 21°C (69°F) on warmer days. This month experiences more precipitation, totaling 43 mm (1.7 in) across 8 days, and a higher humidity of 85%, creating a damp and chilly atmosphere. For a detailed look at the specifics, check out Bucharest weather in February.
When comparing the weather in September and March, the differences are striking. September boasts a mild average temperature of 20°C (68°F) with highs reaching up to 36°C (97°F), while March experiences significantly cooler temperatures, with an average of 6°C (44°F) and lows dipping to -19°C (-2°F). Rainfall is also a factor; September sees only 23 mm (0.9 in) of precipitation over three days, whereas March receives a heftier 61 mm (2.4 in) spread over nine days. Additionally, humidity levels are notably higher in March at 82%, compared to September's 57%. For a closer look at what to expect in March, you can check Bucharest weather in March.
In September, the weather tends to be much warmer and drier compared to April. With average temperatures reaching up to 20°C (68°F) and highs of 36°C (97°F), September offers a summer-like feel, despite minimal precipitation of just 23 mm (0.9 in) over three days. In contrast, April experiences cooler temperatures, averaging around 12°C (54°F) with a maximum of 29°C (84°F) and a higher rainfall of 44 mm (1.7 in) over seven days, contributing to a more humid atmosphere at 73%. For a closer look at what to expect, check out Bucharest weather in April.
In September, temperatures typically range from a crisp 1°C (35°F) at night to a warm 36°C (97°F) during the day, with an average around 20°C (68°F). The month is relatively dry, experiencing only 23 mm (0.9 in) of precipitation over just three days and maintaining a humidity level of 57%. In contrast, May presents a milder climate, with temperatures between a minimum of 4°C (39°F) and a maximum of 31°C (88°F) and an average of 17°C (63°F). However, this month is wetter, receiving 69 mm (2.7 in) of rainfall spread across 11 days and exhibiting higher humidity at 71%. For more detailed insights on the weather in May, you can visit Bucharest weather in May.
When comparing the weather in September and June, we see notable differences in temperature and precipitation. September experiences a broader temperature range, with a minimum of 1°C (35°F) and a maximum of 36°C (97°F), averaging around 20°C (68°F). In contrast, June tends to be milder, with a minimum of 7°C (46°F), an average of 22°C (71°F), and a maximum of 37°C (99°F). However, June is significantly wetter, recording 115 mm (4.5 in) of precipitation over approximately 15 days, while September only has 23 mm (0.9 in) across 3 days. Additionally, humidity levels tend to be higher in June at 70%, compared to September's 57%. For more detailed information, you can check Bucharest weather in June.
When comparing the weather in September to that of July, we can see significant differences in temperatures and precipitation patterns. September features a broader temperature range, with a minimum of 1°C (35°F) and a maximum of 36°C (97°F), yielding an average of 20°C (68°F). In contrast, July is warmer overall, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 38°C (100°F) and an average of 24°C (75°F). Additionally, July experiences much more rainfall, with 90 mm (3.5 in) of precipitation over 10 days compared to September's 23 mm (0.9 in) over just 3 days. The humidity levels are also higher in July at 66%, compared to September's 57%. For more details about July weather, you can check out Bucharest weather in July.
Comparing the weather between September and August reveals notable differences. September experiences a broader temperature range, with minimums dipping to 1°C (35°F) and maximums reaching up to 36°C (97°F), while the average temperature is lower at 20°C (68°F). In contrast, August has milder nights, with a minimum temperature of 11°C (52°F) and an average of 25°C (77°F), peaking at 38°C (101°F). Additionally, September sees less precipitation, totalizing 23 mm (0.9 in) over just 3 days, compared to August, which records 33 mm (1.3 in) over 6 days. The humidity in September is slightly higher at 57%, whereas August has a more comfortable humidity level of 48%. For more detailed insights into August weather, visit Bucharest weather in August.
September and October exhibit notable differences in weather characteristics. In September, temperatures range from a comfortable minimum of 1°C (35°F) to a scorching maximum of 36°C (97°F), with an average of 20°C (68°F). Precipitation is relatively mild, with only 23 mm (0.9 in) falling over just three days and humidity levels averaging 57%. In contrast, October experiences a cooler environment, with temperatures dipping to an average of 13°C (56°F) and a maximum of 31°C (87°F). This month also sees increased rainfall, totaling 70 mm (2.8 in) over seven days, accompanied by a rise in humidity to 79%. For more detailed weather specifics, check out Bucharest weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a mild 1°C (35°F) at night to a warm average of 20°C (68°F), peaking at a sweltering 36°C (97°F) during the day. The month experiences limited rainfall, with only 23 mm (0.9 in) over just three days, and a relatively comfortable humidity level of 57%.
In contrast, November sees much cooler temperatures, with a minimum of -5°C (24°F) and an average of only 7°C (45°F), while the maximum temperature reaches a milder 28°C (82°F). This month is also wetter, receiving 43 mm (1.7 in) of precipitation over eight days and experiencing higher humidity at 87%. For more detailed insights, you can check out Bucharest weather in November.
September and December weather in Bucharest present a stark contrast, both in temperature and precipitation. September enjoys milder temperatures with averages around 20°C (68°F) and daily highs reaching up to 36°C (97°F), accompanied by relatively low rainfall of 23 mm (0.9 in) over just three days. In contrast, December experiences much colder conditions, with average temperatures dropping to 3°C (37°F) and lows plummeting to -9°C (16°F). This month sees significantly increased rainfall, totaling 63 mm (2.5 in) spread over 11 days, contributing to a much higher humidity level of 88%. For more details about December weather in Bucharest, check this link: Bucharest weather in December.
As summer transitions into autumn, September in Bucharest presents a delightful blend of warmth and mildness, making it a unique month compared to the extremes of both summer and winter. While the days can still reach highs of 36°C, the average temperature settles at a comfortable 20°C. With only a few days of rain and 23 mm of precipitation, the weather remains relatively dry, allowing for plenty of outdoor activities. The humidity level at 57% contributes to a pleasant environment, without the oppressive heat often found in July and August. Overall, September offers a refreshing reprieve and is an ideal time for exploring the vibrant city before the coolness of fall sets in. For more detailed insights, check out Bucharest Climate.