Last updated: August 21, 2025
September in Vatican City, Holy See, offers a vibrant climate that beautifully balances warmth and mildness. With maximum temperatures reaching a sweltering 33°C (91°F) and a comfortable average of 22°C (72°F), visitors can expect pleasant days ideal for exploring the city's rich history. The nights, cooler with a minimum of 8°C (47°F), provide a refreshing contrast. Rainfall amounts to 104 mm (4.1 in) over approximately 8 days, making for an intermittently damp backdrop to the early autumn charm. With humidity levels around 71%, expect a moderately muggy atmosphere, perfect for enjoying both the spiritual and cultural treasures of this unique destination.
In September, Vatican City experiences a delightful transition as summer gradually gives way to autumn. With minimum temperatures averaging around 8°C (47°F) and maximums reaching up to 33°C (91°F), the month strikes a pleasant balance between warm days and cooler evenings. The average temperature hovers around 22°C (72°F), making it an ideal time for exploration, whether wandering through sunlit piazzas or enjoying the late summer festivities. As the sizzling heat of August recedes, September invites visitors to bask in its more moderate warmth, showcasing the city's rich culture and history in a comfortable atmosphere.
September in Vatican City marks a notable transition, as the city experiences its highest monthly precipitation of the year at 104 mm (4.1 in), spread over 8 days. This increase signifies a shift from the typically drier summer months, with August seeing only 17 mm (0.7 in) of rain. As the weather begins to cool, September’s rainfall prepares the ground for the lush autumn that follows, contrasted sharply by the dry weeks of June to August. In fact, this month’s precipitation sets the stage for a series of wetter months ahead, culminating in November’s significant 161 mm (6.3 in). Such trends highlight the climatic shift within the region, where September serves as a bridge from the leisurely summer days into the more abundant and refreshing fall season.
As the summer heat gently fades, September in Vatican City welcomes a slight dip in humidity to 71%, making it a comfortable transition into autumn. This month is characterized by a gradual decrease from the peak summer levels, which reached 70% in July and a lower 68% in August. Following September, humidity values tend to rise again in October to 76%, beginning the slow climb back toward winter's higher moisture levels, peaking at 79% in November. Overall, the trend showcases a balancing act between the lingering warmth of summer and the cool embrace of fall, offering visitors a pleasant atmosphere to explore the rich history and culture of the Holy See.
In September, Vatican City experiences a UV Index of 7, placing it in the high exposure category. This provides a slight reprieve from the very high levels seen in the peak summer months of July and August, which reached an intense UV Index of 10. As a result, the recommended burn time increases to 25 minutes, allowing visitors a little more time to enjoy the beautiful outdoor sights without immediate risk of sunburn. This trend of decreasing UV levels continues into the fall, signaling the gradual shift from summer’s harsh rays to more moderate conditions. For those planning outdoor activities during this month, it's essential to remain vigilant about sun protection. For more detailed information, check out the Vatican City UV Index.
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As summer fades into autumn, September in Vatican City brings a delightful 337 hours of sunshine, marking a gentle transition from the sun-soaked days of July and August. This month typically sees a dip in sunshine compared to the peak summer months, yet it retains a significant amount of bright days, standing out amidst the annual cycle. Following May's remarkable high of 397 hours and June's encouraging 417 hours, September continues to reflect the warm glow of late summer before the shorter days of October set in. With sunshine levels gradually decreasing as the year progresses, September's radiant days serve as a beautiful reminder of the summer just past, inviting visitors to appreciate the rich history and breathtaking beauty of the Vatican under the warm Italian sun.
September in Vatican City offers a refreshing balance of mild temperatures and sunny days, with a 57% chance of sunshine. This month marks a transition from the summer heat, which peaks in July and August, boasting probabilities of 69% and 73% respectively. As the city prepares for autumn, the likelihood of clear skies remains relatively robust, aligning closely with the sunnier months of March and June. Despite a slight dip in sun chances compared to the summer months, September still promises enjoyable weather, making it an inviting time for visitors to explore the rich history and culture of the Vatican.
As the summer sun begins to wane, September in Vatican City witnesses a transition in daylight duration, offering around 12 hours of sunlight—a gentle decline from the peak 15 hours experienced in June. This gradual decrease reflects the onset of autumn, with the daylight hours lessening from the vibrant months of summer, yet still providing ample time for exploration and reflection in the city's iconic surroundings. Following September, the daylight tapers further into October's 11 hours, hinting at the impending shorter days of winter. This seasonal shift encapsulates the beauty of change, allowing visitors to appreciate the rich history and culture of Vatican City under the warm, golden hues of early autumn.
As summer fades and autumn begins, September in Vatican City sees a gentle breeze with an average wind speed of 1.8 m/s (4 mph). This marks a noticeable decline from the busier months of July and August, where the wind flirted around 2.6 m/s (6 mph). Interestingly, the transition continues into October, where the winds pick up slightly again to 2.6 m/s (6 mph). Overall, September presents a serene and calm atmosphere, a perfect backdrop for the timeless beauty of the Vatican, allowing visitors to enjoy its majestic wonders in the quiet embrace of early fall.
Weather in Vatican City varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Vatican City, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present quite a contrast in weather conditions. In September, temperatures can range from a minimum of 8°C (47°F) to a maximum of 33°C (91°F), offering an average of 22°C (72°F). The month experiences 104 mm (4.1 in) of precipitation over about 8 days, while humidity averages around 71%. In stark contrast, January features much cooler temperatures, with lows dipping to -4°C (26°F) and highs reaching only 19°C (66°F), leading to a chilly average of 7°C (45°F). Precipitation is lighter at 62 mm (2.4 in) over the same number of days, but humidity increases to 80%. For more details on January weather specifically, check out Vatican City weather in January.
September and February present striking contrasts in weather. In September, temperatures typically range from a mild 8°C (47°F) at night to a warm 33°C (91°F) during the day, with an average of around 22°C (72°F). This month also sees higher precipitation, totaling 104 mm (4.1 in) over about 8 days, accompanied by a humidity level of 71%. In contrast, February experiences colder temperatures, with lows plunging to -10°C (14°F) and daytime highs reaching only 21°C (69°F), averaging around 9°C (49°F). Precipitation in February is somewhat lower, at 78 mm (3.1 in), occurring over 9 days, and the humidity remains slightly higher at 73%. For more detailed information, check out Vatican City weather in February.
When comparing the weather in September and March, one can see a significant contrast in temperatures and conditions. September offers milder warmth, with average temperatures ranging from a minimum of 8°C (47°F) to a maximum of 33°C (91°F), and a moderate level of humidity at 71%. In contrast, March experiences much cooler temperatures, with minimums dropping to -11°C (12°F) and average highs of 23°C (75°F), making it considerably chillier overall. Precipitation levels are somewhat similar, with September receiving 104 mm (4.1 in) over 8 days and March totaling 80 mm (3.2 in) over 9 days, but the humidity is slightly lower in March at 69%. For more detailed insights on the weather specifics for March, you can refer to this link: Vatican City weather in March.
When comparing the weather in September and April, notable differences can be observed. September experiences warmer temperatures overall, with a minimum of 8°C (47°F) and a maximum reaching 33°C (91°F), whereas April has a cooler range, with minimum temperatures dipping to 1°C (34°F) and a maximum of 28°C (82°F). Additionally, September is generally drier, receiving 104 mm (4.1 in) of precipitation over 8 days compared to April's 69 mm (2.7 in) over 9 days. Both months have relatively high humidity levels, with September at 71% and April slightly higher at 74%. For a deeper dive into April's climate specifics, visit Vatican City weather in April.
In comparing the weather between September and May, September typically presents warmer average temperatures with a minimum of 8°C (47°F) and an average of 22°C (72°F), while May boasts slightly cooler temperatures, starting at a minimum of 6°C (42°F) and averaging around 18°C (65°F). Both months experience relatively warm days, with September reaching a maximum of 33°C (91°F) and May hitting 34°C (93°F). While September sees more precipitation overall at 104 mm (4.1 in) across 8 days, May has 77 mm (3.0 in) spread over 11 days, indicating a slightly wetter month but lower total amount. Humidity levels are also quite similar, with September at 71% and May slightly higher at 76%. For a more detailed look at May weather, you can refer to this link: Vatican City weather in May.
When comparing the weather in September and June, we notice some distinct contrasts. September boasts a minimum temperature of 8°C (47°F) and can reach a maximum of 33°C (91°F), with an average temperature of 22°C (72°F). It is also relatively wet, receiving about 104 mm (4.1 in) of precipitation over 8 days, with humidity at 71%. Conversely, June is warmer overall, with a minimum of 12°C (54°F) and a maximum reaching up to 36°C (97°F), averaging 23°C (74°F). It tends to be drier, with only 31 mm (1.2 in) of rain falling over 5 days and a slightly higher humidity of 73%. For more specific details, you can check the Vatican City weather in June.
In comparing the weather between September and July, we see notable differences. July experiences higher minimum and maximum temperatures, with lows around 17°C (63°F) and highs reaching up to 37°C (99°F). In contrast, September has a much cooler minimum temperature of 8°C (47°F) and peaks at 33°C (91°F). Moreover, July is relatively dry with just 23 mm (0.9 in) of precipitation over 3 days, while September sees increased rainfall, accumulating 104 mm (4.1 in) across 8 days. Both months maintain similar humidity levels, around 70-71%. For a more detailed view, you can refer to the information on Vatican City weather in July.
In comparing the weather of September to that of August, we notice a significant shift in temperatures and precipitation patterns. September experiences cooler minimum temperatures, dropping to 8°C (47°F) compared to August's minimum of 15°C (59°F). While the average temperature in September is 22°C (72°F) and the maximum reaches 33°C (91°F), August boasts a warmer average of 27°C (80°F) and can peak at a scorching 39°C (103°F). Additionally, September is much wetter with 104 mm (4.1 in) of precipitation spread over 8 days, contrasting sharply with August's mere 17 mm (0.7 in) over just 4 days. Humidity levels are slightly higher in September at 71%, compared to 68% in August. For more details on August's climate, you can check out Vatican City weather in August.
September and October showcase a gradual transition in weather conditions. In September, temperatures typically range from a minimum of 8°C (47°F) to a maximum of 33°C (91°F), with an average of 22°C (72°F), making it warmer than October. October sees a slight drop, with temperatures ranging from 7°C (45°F) to 30°C (87°F) and an average of 17°C (63°F). Precipitation is slightly lower in October at 92 mm (3.6 in), compared to September's 104 mm (4.1 in), although October experiences an additional day of rain, occurring on 9 days total. Humidity also increases in October to 76%, up from 71% in September. For more detailed information, you can check the climate specifics at Vatican City weather in October.
September generally offers a warm and pleasant climate, with average temperatures around 22°C (72°F) and highs reaching up to 33°C (91°F). In contrast, November brings a significant drop in temperatures, with average highs only reaching 24°C (75°F) and nighttime lows potentially dipping to 0°C (31°F). Additionally, November sees increased precipitation, totaling 161 mm (6.3 in) across 15 days, compared to September's 104 mm (4.1 in) over 8 days. The humidity also rises in November, peaking at 79%, making the weather feel considerably more damp. For a detailed look at November weather, check out Vatican City weather in November.
September and December present contrasting weather patterns. In September, temperatures range from a mild 8°C (47°F) at night to a warm 33°C (91°F) during the day, with an average of 22°C (72°F). The month experiences approximately 104 mm of precipitation over 8 days, paired with a humidity level of 71%. In contrast, December sees a significant drop in temperatures, with nighttime lows plunging to -2°C (28°F) and daytime highs reaching only up to 18°C (65°F), averaging around 9°C (48°F). This month is wetter, with 135 mm of rainfall spread over 13 days, accompanied by higher humidity levels at 77%. For more specific insights into the climate, check out Vatican City weather in December.
As September unfolds in Vatican City, visitors experience a delightful transition from the warm summer to the cooler autumn months. While temperatures can still reach a maximum of 33°C (91°F), the average settles at a comfortable 22°C (72°F), making it an ideal time for exploring the city's rich history and stunning architecture. Unlike the more humid summer months, September sees a balance with an average humidity of 71%, accompanied by about 8 days of precipitation, accumulating to 104 mm (4.1 in). This combination of warm days and refreshing evenings creates a unique charm that distinguishes September from other months. For a comprehensive overview of seasonal variations, check out Vatican City Climate.