Last updated: August 21, 2025
Sveti Vlas in September offers a delightful blend of warm and comfortable weather, perfect for enjoyably outdoor activities. With maximum temperatures reaching up to 30°C (86°F) and an average of 21°C (69°F), the climate is pleasantly inviting. Evenings might cool down to a refreshing 10°C (50°F), ideal for a stroll along the picturesque coastline. While the month sees about 22 mm (0.9 in) of precipitation spread over roughly 5 days, the humidity remains moderate at 63%, ensuring a balanced ambiance throughout your stay. Embrace the gentle September vibes and explore the beauty of Sveti Vlas!
In Sveti Vlas, Bulgaria, September marks a delightful transition into autumn, characterized by mild temperatures that invite outdoor exploration. With minimums around 10°C (50°F) and average highs peaking at 30°C (86°F), the month offers a perfect blend of warmth and comfort. As summer gives way to fall, the weather remains pleasantly warm, with averages of 21°C (69°F), making September an ideal time for both beach activities and hiking. The gradual drop in temperatures from the scorching peaks of July and August signals a shift to a more temperate climate, while still retaining the lingering charm of summer’s end. Thus, if you're seeking a vibrant yet serene getaway, September in Sveti Vlas certainly delivers.
In September, Sveti Vlas experiences a modest transition in precipitation, with an average of 22 mm (0.9 in) of rainfall over 5 days. This marks a slight increase from the nearly dry summer months, particularly August's minimal 15 mm, indicating a gradual shift towards the wetter autumn season. While the rainfall is relatively light, it refreshes the landscape, signaling a welcome change after the warm summer days. As October approaches, precipitation is set to rise significantly, reflecting the region's typical climate pattern of increased rainfall in the fall months, with October averaging 69 mm. Overall, September's precipitation serves as a gentle reminder of the cyclical nature of weather in Sveti Vlas, blending the tail end of summer warmth with the refreshing promise of autumn rains.
As summer bids farewell, September in Sveti Vlas, Bulgaria, brings a subtle shift in humidity, settling at 63%—a moderate level that reflects the gradual change in seasons. Throughout the summer months, humidity levels dipped to a comfortable 60% in August, making the coastal town a haven for sun-seekers. However, as autumn approaches, September's humidity creates a pleasant balance, slightly higher than in the peak of summer but far lower than the dampness experienced in winter months, which soar back to around 84% by December. This transitional humidity not only enhances the refreshing sea breeze but also makes early fall an ideal time for outdoor activities, offering visitors the perfect blend of warm days and cooler nights.
As September unfolds in Sveti Vlas, Bulgaria, the UV Index stands at a high level of 7, indicating that sun exposure requires a bit more caution as burn time shortens to 25 minutes. This marks a slight decline from the peak summer months, where the UV Index reached a very high 9. However, September still offers plenty of sunshine, as the sun's intensity remains significant, making it essential for beachgoers and outdoor enthusiasts to protect their skin. A clear trend emerges through the season—while summer brings extreme levels of UV radiation, the early fall transition maintains a considerable amount of sun exposure, encouraging awareness for safe outdoor activities. For more detailed insights on UV levels throughout the year, check out Sveti Vlas UV Index.
UV Risk Categories
September in Sveti Vlas, Bulgaria, offers a delightful transition from the peak summer sun, basking in 341 hours of glorious daylight. The days gradually shorten as autumn approaches, yet September still shines brightly when compared to earlier months like October and November, which see a drop to 284 and 223 hours, respectively. This precious month strikes a perfect balance, offering sunny days ideal for lingering on the beaches or exploring the charming coastal towns. As summer fades, September serves as a gentle reminder of the warmth and light that enveloped the region, showcasing a slower pace while retaining its enchanting allure.
As summer transitions into autumn, September in Sveti Vlas offers a delightful 53% chance of sunny weather. This marks a significant dip from the sun-drenched months of July and August, which boast chances of 77% and 75%, respectively. Interestingly, September retains a favorable disposition compared to the colder months that follow, such as October with only 32% and November at 31%. With this balanced blend of sun and warmth, September stands as an ideal time to enjoy the lingering beauty of the Bulgarian coastline before the cool embrace of autumn descends.
In Sveti Vlas, Bulgaria, the daylight duration begins to taper off in September, offering around 12 hours of light, a gentle transition from the sun-drenched days of summer. Following the peak of 15 hours in June, the amount of daylight gradually diminishes, with a consistent decline through the fall months. After September, daylight dips to 11 hours in October and further decreases to 9 hours by November and December. This gradual ebb in daylight reflects the shifting seasons, marking a time of change and preparation for the upcoming winter months. As the days shorten, the charm of evening skies becomes more pronounced, inviting cozy moments and serene sunsets in this beautiful coastal town.
As summer fades into autumn, September in Sveti Vlas, Bulgaria, welcomes a gentle breath of air with an average wind speed of 3.9 m/s (9 mph). This mild breeze is a delightful transition from the warmer months, where July and August maintain similar speeds at 3.2 m/s and 3.0 m/s respectively. Compared to the preceding months, September's winds begin to pick up again, signaling a shift as the cooler October approaches, which sees an increase to 4.6 m/s (10 mph). Overall, the gradual ebb and flow of wind speeds throughout the year mirrors the calming rhythm of the seasons, enhancing the tranquil beauty of this coastal gem as it prepares for its autumnal charm.
Weather in Sveti Vlas varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sveti Vlas, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather experiences. In September, temperatures range from a mild 10°C (50°F) at night to a warm average of 21°C (69°F), peaking at 30°C (86°F), while the month sees relatively low precipitation of 22 mm over just five days and a humidity level of 63%. In stark contrast, January is much colder, with nighttime lows dropping to -10°C (14°F) and an average temperature of only 4°C (39°F), reaching a maximum of 16°C (61°F). This winter month is also wetter, recording 66 mm of precipitation across eight days, accompanied by higher humidity at 84%. For more details on January weather, visit Sveti Vlas weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a pleasant 10°C (50°F) at night to a warm 30°C (86°F) during the day, with an average of 21°C (69°F). The month sees relatively low precipitation at 22 mm (0.9 in) across about 5 days, accompanied by a moderate humidity level of 63%. In stark contrast, February experiences much colder temperatures, with a minimum of -5°C (23°F) and a maximum of 17°C (63°F), averaging just 6°C (42°F). This month is notably wetter, receiving 48 mm (1.9 in) of precipitation over approximately 7 days and a higher humidity of 81%. For more detailed information, you can check Sveti Vlas weather in February.
September and March present quite contrasting weather conditions. In September, temperatures range from a pleasant 10°C (50°F) at night to a warm 30°C (86°F) during the day, with an average of 21°C (69°F). This month sees relatively low precipitation, with only 22 mm (0.9 in) falling over about 5 days and a moderate humidity of 63%.
Conversely, March experiences a much cooler climate, with nighttime temperatures dipping to -9°C (16°F) and daytime highs reaching just 19°C (67°F), averaging 7°C (45°F). Precipitation is more pronounced in March, totaling 57 mm (2.3 in) across approximately 9 days, accompanied by higher humidity at 79%. For more detailed information on March weather, visit Sveti Vlas weather in March.
When comparing the weather in September and April, notable differences emerge. September typically boasts a warmer climate, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 30°C (86°F), while April sees much cooler conditions, with temperatures ranging from 2°C (36°F) to 23°C (73°F). Additionally, September experiences less precipitation, totaling 22 mm (0.9 in) over about 5 days, compared to April's 40 mm (1.6 in) over 7 days. The humidity levels are also slightly higher in April at 75%, versus September's 63%. For more detailed information on April weather, you can visit Sveti Vlas weather in April.
September showcases a warmer climate compared to May, with average temperatures peaking at 21°C (69°F) and occasionally reaching up to 30°C (86°F). In contrast, May's average temperature is a cooler 16°C (62°F), with highs reaching only 27°C (81°F). While September typically sees 22 mm (0.9 in) of precipitation over about 5 days, May is wetter, boasting 46 mm (1.8 in) over 8 days. Additionally, humidity levels in May are higher at 77%, compared to September's more comfortable 63%. For more details about May weather, check out Sveti Vlas weather in May.
When comparing the weather in September and June, we observe some notable differences despite their similar average temperatures of around 21°C (70°F). September generally offers a slightly wider temperature range with minimums dipping to 10°C (50°F) and maximums reaching up to 30°C (86°F), while June stays a bit warmer with minimums of 12°C (53°F) and a maximum of 30°C (87°F). Additionally, September experiences significantly less precipitation, with only 22 mm (0.9 in) over about 5 days, compared to June's 82 mm (3.2 in) over 14 days. Humidity levels are also higher in June at 71%, compared to 63% in September. For more detailed weather insights, you can check Sveti Vlas weather in June.
When comparing the weather in September and July, we observe several notable differences. July tends to be warmer, with average temperatures reaching 23°C (75°F) and a maximum of 33°C (91°F), while September cools down to an average of 21°C (69°F) with a maximum of 30°C (86°F). Additionally, July experiences higher humidity levels at 69% compared to September's 63%. In terms of precipitation, July receives more rain, totaling 50 mm (2.0 in) over 7 days, whereas September has a lighter rainfall of 22 mm (0.9 in) spread across just 5 days. For more detailed information, check out Sveti Vlas weather in July.
In comparing the weather of September to that of August, September presents a more moderate temperature range, with a minimum of 10°C (50°F) and an average of 21°C (69°F), compared to August's higher temperatures, which feature a minimum of 16°C (62°F) and an average of 24°C (76°F). While August often reaches scorching highs of 33°C (91°F), September's maximum temperature peaks at a milder 30°C (86°F). In terms of precipitation, September sees slightly more rainfall at 22 mm (0.9 in) over 5 days, in contrast to August's 15 mm (0.6 in) over just 3 days. Both months maintain similar humidity levels, with September at 63% and August at 60%. For a detailed look at weather trends during August, you can check Sveti Vlas weather in August.
September typically enjoys warmer temperatures, with averages around 21°C (69°F) and maximums reaching 30°C (86°F), while nighttime lows are often around 10°C (50°F). The month sees relatively low precipitation, accumulating about 22 mm (0.9 in) over just five days and maintaining a moderate humidity level of 63%. In contrast, October experiences a notable drop in both temperature and precipitation; temperatures average 15°C (60°F) with max highs of 27°C (81°F) and lows dipping to 7°C (45°F). This month also brings increased rainfall of 69 mm (2.7 in) spread over seven days, contributing to a higher humidity of 76%. For more insights on October weather, you can visit Sveti Vlas weather in October.
September and November present a stark contrast in weather conditions. In September, temperatures range from a minimum of 10°C (50°F) to a comfortable average of 21°C (69°F), peaking at 30°C (86°F). This month is relatively dry, with only 22 mm (0.9 in) of precipitation spread over 5 days and a humidity level of 63%. In contrast, November experiences much cooler temperatures, with lows dipping to -1°C (30°F) and an average of 11°C (52°F), while maxing out at 23°C (74°F). It is also considerably wetter, seeing 59 mm (2.3 in) of precipitation over 8 days and higher humidity at 81%. For a detailed overview of the weather in Sveti Vlas during this month, you can visit Sveti Vlas weather in November.
In September, the weather tends to be mild and pleasant, with average temperatures around 21°C (69°F) and maximums reaching up to 30°C (86°F). The month experiences relatively low precipitation at 22 mm (0.9 in) over just five days, accompanied by a comfortable humidity level of 63%. In contrast, December brings a significant shift, with average temperatures dropping to 7°C (45°F) and minimums plunging to -5°C (24°F). Precipitation increases considerably to 75 mm (2.9 in) spread across ten days, and humidity rises to 84%, creating a much chillier and wetter atmosphere. For more detailed information about the weather specifics, you can check Sveti Vlas weather in December.
As September arrives in Sveti Vlas, the summer heat begins to wane, offering a delightful transition into autumn. With daytime temperatures comfortably averaging around 21°C (69°F), visitors can enjoy a pleasant escape from the intense summer heat characteristic of July and August. The humidity level stays moderate at 63%, making outdoor activities enjoyable without the sticky discomfort of peak summer months. Rainfall is minimal, with only a few days experiencing light showers, leading to a generally dry and sunny atmosphere perfect for exploring the stunning coastal landscapes. For a deeper understanding of what to expect throughout the year, visit Sveti Vlas Climate.