Last updated: March 24, 2025
Bologna in September features a rich tapestry of weather, with maximum temperatures soaring up to 34°C (93°F), providing plenty of warmth for outdoor exploration. On average, temperatures hover around a comfortable 21°C (70°F), perfect for enjoying the city’s vibrant culture. However, the month also sees cooler nights, with lows dipping to 7°C (45°F), so a light jacket may be necessary. Rainfall amounts to 86 mm (3.4 in) over approximately 10 days, contributing to the area’s lush landscapes. With a humidity level of 66%, visitors can expect a pleasantly warm climate, ideal for wandering through Bologna's historic streets while savoring local cuisine.
In September, Bologna basks in the lingering warmth of summer, with temperatures gradually transitioning into the crispness of autumn. The average temperature settles at a comfortable 21°C (70°F), while daytime highs can reach an inviting 34°C (93°F), making it an ideal time for outdoor exploration. As the month progresses, evening temperatures cool down, dipping to a refreshing 7°C (45°F), perfect for enjoying the city's famed al fresco dining. This blend of warm days and cooler nights sets the stage for a delightful experience, whether you’re wandering through historic streets or savoring local cuisine. The clear skies and pleasant climate make September a prime time to immerse yourself in the vibrant culture of Bologna before the chill of autumn truly takes hold.
September in Bologna marks a notable transition in weather as the summer heat begins to fade, bringing an increase in precipitation. With 86 mm (3.4 inches) of rain recorded over 10 days, this month stands out as one of the wetter times of the year. This uptick follows a relatively dry August and sets the stage for the wetter months ahead, particularly November, which averages 118 mm (4.6 inches) of rain. The shift not only revitalizes the landscape but also signals the gradual approach of autumn, making September a month of refreshing change in the Emilia-Romagna capital.
As summer turns to autumn, September in Bologna brings a noticeable shift in humidity, settling at 66%. This marks a slight increase from the drier months of July and August, which saw the lowest levels at 61% and 54%, respectively. The gradual rise in humidity hints at the approach of the rainy season, with October expected to see a significant jump to 83%. Overall, the trend reveals a steady decline in humidity from the start of the year, peaking towards winter as the colder months draw nearer. September serves as a gentle reminder of the changing seasons, balancing the lingering warmth of summer with the impending chill of autumn.
As September unfolds in Bologna, Italy, the UV Index settles at a moderate level of 7, indicating a transition from the heights of summer. After the peak UV exposure in July and August, with values of 9 and 8 respectively, this month offers slightly more protection while still calling for caution during outdoor activities. With a burn time of 25 minutes, it's a reminder that while the summer heat begins to wane, harmful UV rays remain a concern. As autumn approaches, maintaining awareness of UV levels is crucial in striking a balance between enjoying the pleasant weather and protecting your skin. For more details, check out the Bologna UV Index.
UV Risk Categories
September in Bologna brings a delightful transition, with 336 hours of sunshine that echo the warm embrace of summer while hinting at the approach of autumn. After a peak in July with 427 hours, the days begin to taper just slightly, yet September’s glow remains generous compared to earlier months. In fact, it boasts more sun than any month from November through May, offering a vibrant backdrop for leisurely strolls through the city's historic streets. As the sun sets earlier, the warmth of September sun invites both locals and tourists to savor the rich flavors of Bologna’s culinary scene in the golden twilight, making it a perfect time to unwind before the cooler months arrive.
In Bologna, Italy, September ushers in a refreshing transition from the sweltering summer months, providing a 55% chance of sunny weather. This likelihood is a modest drop from August's 62% but remains favorable compared to the earlier spring months. As the city moves from the high summer sunshine of July and August, the chance of sun in September still offers ample opportunities for outdoor exploration. Notably, this percentage marks a noteworthy improvement over the cooler months of October and November, creating a delightful window for both locals and tourists to enjoy Bologna's rich cultural tapestry under pleasant skies. Overall, September stands out as an excellent choice for those seeking sunny days amidst the backdrop of the city's stunning architecture and vibrant atmosphere.
As summer transitions into autumn, September in Bologna, Italy, presents a gentle shift in daylight duration, offering about 12 hours of sunshine. Following the peak of daylight in June and July, which bask in a full 15 hours, September celebrates a comforting reduction, embracing a balance between the sun's lingering warmth and the crispness of fall. This month marks the beginning of a gradual descent in daylight, reflecting the changing seasons as it dips to 10 hours by October. The progression from the lively 14 hours of May highlights a seasonal rhythm, where each month dances along the spectrum of sunlight, inviting residents and visitors alike to relish the last hints of summer before embracing the cozy embrace of autumn.
As summer gracefully transitions into fall, September in Bologna experiences a noticeable dip in average wind speed, reaching a gentle 1.7 m/s (4 mph). This marks one of the calmest months of the year, as the bustling city shifts from the warm embrace of summer to the cooler whispers of autumn. Following the summer months that showcased slightly stronger breezes, September's tranquil winds create an inviting atmosphere, perfect for leisurely strolls through the historic streets. This decline in wind speed not only highlights the seasonal change but also enhances the charm of Bologna, making it a delightful time for visitors to soak in the rich culture and vibrant landscapes in a serene setting.
The weather in Bologna 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 Bologna and find detailed weather information for every month.
September and January present starkly contrasting weather conditions. In September, temperatures range from a minimum of 7°C (45°F) to a peak of 34°C (93°F), accompanied by an average of 21°C (70°F). This month typically experiences 86 mm (3.4 in) of precipitation over about 10 days, with humidity levels around 66%. In contrast, January is much cooler, with temperatures ranging from a minimum of -6°C (22°F) to a maximum of only 15°C (59°F) and an average of 4°C (39°F). Precipitation during this month is significantly lower at 24 mm (1.0 in) over approximately 4 days, and the humidity rises to 87%. For more detailed information, you can check Bologna weather in January.
September and February present strikingly different weather patterns. In September, temperatures range from a mild 7°C (45°F) to a warm maximum of 34°C (93°F), with an average of 21°C (70°F). The month experiences about 86 mm (3.4 in) of precipitation over approximately 10 days, accompanied by a moderate humidity level of 66%. In contrast, February is characterized by much colder conditions, with temperatures dipping as low as -9°C (16°F) and reaching a maximum of 21°C (70°F), while the average temperature is only around 7°C (45°F). Precipitation in February totals 73 mm (2.9 in) over 9 days, and the humidity is slightly higher at 79%. For a closer look at the weather specifics in February, you can check Bologna weather in February.
When comparing the weather between September and March, there are notable differences in temperature and precipitation. September enjoys a warm average temperature of 21°C (70°F), peaking at 34°C (93°F), while March is considerably cooler, with an average of only 10°C (50°F) and a maximum of 25°C (77°F). Precipitation in September is higher, with 86 mm (3.4 in) over about 10 days compared to March’s 48 mm (1.9 in) across 7 days. Interestingly, both months have similar humidity levels, with September at 66% and March at 69%. For those looking for more detailed information, check out Bologna weather in March.
In comparing the weather between September and April, a marked contrast in temperatures is evident. September boasts milder conditions, with average temperatures reaching a comfortable 21°C (70°F) and maximums soaring to 34°C (93°F). In contrast, April's temperatures are cooler, with an average of 14°C (57°F) and nighttime lows dipping as low as -1°C (31°F). While September experiences more precipitation, totaling 86 mm (3.4 in) over about 10 days, April sees slightly less, with 59 mm (2.3 in) falling over 8 days. Interestingly, April has a higher humidity level at 71%, compared to September's 66%. For those looking to explore the weather patterns in April specifically, more details can be found here: Bologna weather in April.
In September, the weather is generally warmer, with average temperatures around 21°C (70°F) and maximums reaching up to 34°C (93°F). In contrast, May sees slightly cooler temperatures, averaging 18°C (65°F) and peaking at 32°C (90°F). Both months experience notable humidity levels, with September at 66% and May slightly higher at 70%. Rainfall is also more frequent in May, with 112 mm (4.4 in) over 14 days, compared to September's 86 mm (3.4 in) over 10 days. For a detailed look at May's climate, check out Bologna weather in May.
In comparing the weather between September and June, September features a wider temperature range, with minimums dipping to 7°C (45°F) and maximums reaching 34°C (93°F). In contrast, June offers warmer conditions, with a minimum of 12°C (55°F) and maximums soaring to 39°C (102°F), making it the hotter month overall. While September experiences more precipitation, totaling 86 mm (3.4 in) over approximately 10 days, June is relatively drier with only 48 mm (1.9 in) over 7 days. Humidity levels are quite similar, with September at 66% and June slightly lower at 65%. For detailed insights into June's weather patterns, you can check Bologna weather in June.
In comparing the weather of September to that of July, it's clear that September experiences a wider temperature range, with minimums dipping to 7°C (45°F) and maximums reaching up to 34°C (93°F). In contrast, July presents a warmer profile, with minimum temperatures averaging 15°C (60°F) and soaring to a maximum of 38°C (100°F). Precipitation in September is slightly higher, totaling 86 mm (3.4 in) over 10 days, compared to July's 60 mm (2.3 in) over 8 days. Additionally, September sees a higher humidity level at 66%, while July maintains a lower humidity of 61%. For more specific information, you can check out Bologna weather in July.
In comparing the weather between August and September, September tends to be cooler, with average temperatures ranging from a minimum of 7°C (45°F) to a maximum of 34°C (93°F), while August boasts warmer averages between 13°C (55°F) and 40°C (105°F). Although September sees a slightly higher amount of precipitation at 86 mm (3.4 in) over 10 days compared to August's 49 mm (1.9 in) over 8 days, the humidity is notably higher in September at 66%, compared to 54% in August. For more detailed insights, you can refer to Bologna weather in August.
In September, the weather typically features warmer temperatures, with averages around 21°C (70°F) and maximums reaching as high as 34°C (93°F). This month experiences a total precipitation of 86 mm (3.4 in) over about 10 days, alongside a humidity level of 66%. In contrast, October sees a significant drop in temperature, averaging 15°C (60°F) and peaking at 27°C (82°F). The precipitation decreases to 65 mm (2.5 in) over roughly 7 days, but humidity rises to a higher average of 83%. For more specific details about weather patterns in this month, you can check Bologna weather in October.
September weather is typically warm and variable, with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 34°C (93°F), and an average temperature of 21°C (70°F). This month sees approximately 86 mm (3.4 in) of precipitation over 10 days, coupled with a humidity level of 66%. In contrast, November brings a significant drop in temperatures, with a range from -2°C (29°F) to 20°C (68°F), averaging just 10°C (51°F). Rainfall increases to 118 mm (4.6 in) over 12 days, and humidity rises to a more pronounced 88%. For more details, you can check Bologna weather in November.
September and December present starkly different weather patterns. September typically enjoys milder temperatures, ranging from a minimum of 7°C (45°F) to a maximum of 34°C (93°F), with an average of 21°C (70°F). This month also sees considerable rainfall, with precipitation reaching 86 mm (3.4 in) over about 10 days, contributing to a moderate humidity of 66%. In contrast, December experiences much colder weather, with temperatures dropping to a minimum of -6°C (22°F) and an average of only 5°C (42°F). The maximum temperature during this month reaches just 16°C (61°F), and while precipitation decreases slightly to 74 mm (2.9 in), the humidity increases to 85%. For more detailed insights on December weather, you can explore this link: Bologna weather in December.
As summer fades, September in Bologna presents a delightful transition marked by warm days and cool evenings. With average temperatures hovering around a comfortable 21°C (70°F), this month invites outdoor exploration, though visitors should be prepared for occasional rain, as approximately 10 days bring 86 mm (3.4 in) of precipitation. The humidity at 66% adds a touch of summer's lingering warmth, creating a vibrant atmosphere that differs significantly from the sweltering heights of July and August. This is an ideal time to enjoy the rich cultural experiences Bologna offers, all against a backdrop of shifting colors and changing seasons. For more insights, check out Bologna Climate.