Last updated: March 24, 2025
Explore the January weather in Siena, Italy, where crisp air and picturesque landscapes await. With maximum temperatures reaching 15°C (59°F) and an average of 5°C (41°F), visitors can enjoy outdoor strolls amidst the stunning architecture. The month can bring cooler nights, with temperatures dipping to a chilly -5°C (23°F). Rainfall is moderate, totaling 44 mm (1.7 in) over about 7 days, contributing to the region's lush greenery. Humidity levels are relatively high at 84%, adding to the brisk atmosphere. Whether you’re sipping coffee in a quaint café or exploring historical sites, January in Siena offers a unique blend of winter charm.
In January, Siena experiences a chilly embrace, with temperatures ranging from a brisk -5°C (23°F) to a mild 15°C (59°F) at their peak. The average temperature hovers around 5°C (41°F), offering a serene winter atmosphere perfect for cozy strolls through the historic streets. As the month progresses into February, temperatures remain similarly low, but with a hint of warmth beginning to emerge, as the average nudges up to 7°C (46°F). The early months of the year highlight a gradual warming trend, leading to spring’s arrival, where temperatures gradually rise to 12°C (55°F) by April, ushering in the vibrancy of the season. This pattern is reflective of the region's shift from winter's chill to the temperate, inviting climate of spring, making Siena an enchanting place to visit during this transitional period.
In January, Siena experiences a modest precipitation of 44 mm (1.7 in) over approximately 7 days, marking the onset of winter's chill. This amount is relatively low compared to the wetter months that follow, particularly November, which sees a substantial 148 mm (5.8 in) as winter deepens. Through the months, precipitation gradually increases, peaking in April and May with 81 mm (3.2 in) and 91 mm (3.6 in) respectively, heralding the arrival of spring. Interestingly, the pattern reveals that while January is drier, precipitation is consistently higher in late autumn and spring, suggesting a seasonal rhythm that characterizes Siena's climate.
In January, Siena experiences notably high humidity, averaging around 84%, which sets the tone for a winter characterized by a cool, damp atmosphere. As the month transitions into February, humidity begins to decline to 76%, hinting at a gradual shift towards drier conditions. This trend continues into the spring months, with March seeing a drop to 68% and April stabilizing at 70%. By the time we reach May, humidity remains relatively consistent at 69%, offering a comfortable environment as warmer days approach. The summer months bring even drier air, with July and August experiencing the lowest humidity levels at 57% and 55%, respectively. However, as the seasons change and autumn descends, humidity begins to rise again, peaking back at 84% in November, before slightly easing to 83% in December. This cyclical pattern highlights Siena's seasonal humidity variations, creating a dynamic climate that ebbs and flows throughout the year.
In January, Siena, Italy experiences a low UV Index of 2, indicating minimal risk of harm from unprotected sun exposure, with a burn time of approximately 45 minutes. As the months progress, the UV Index gradually increases, peaking at 10 in June and July, which signals a shift to very high exposure – a stark contrast to the gentle beginnings of the year. This trend suggests that visitors should take greater precautions as they move into spring and summer, notably reducing their burn time to just 15 minutes during the peak months. The variation in UV levels highlights the importance of being sun-smart, even in winter months, as January and December both maintain a low index and longer burn times. For a detailed view of the UV Index throughout the year, visit Siena UV Index.
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As the new year unfolds in Siena, January brings a modest 185 hours of sunshine, setting the stage for what lies ahead. This tranquil month is followed by a noticeable increase in brightness, with February embraced by 231 hours of sunshine. Spring awakens with March showcasing an impressive 311 hours, while April shines even brighter with 340 hours. As we transition into the heart of summer, June and July bask in an abundance of light, reaching peak hours of 417 and 432, respectively. However, by August, a slight decline to 402 hours begins the slow return to the softer light of autumn. The sun continues its descent into autumn, offering 335 hours in September, and tapering off to 304 hours in October, before winter settles in with 228 hours in November and 216 in December. This annual dance of sunlight illuminates Siena’s captivating transformation through the seasons.
In Siena, Italy, January brings a 31% chance of sunny weather, indicating that the month is quite cloudy compared to the brighter days ahead. As winter progresses into February, the likelihood of sunshine increases to 42%, setting the stage for a gradual warming trend as spring nears. By the time March arrives, the probability of sunshine jumps significantly to 62%, showcasing the region's transition into sunnier, more vibrant months. This upward trajectory continues, peaking in the summer with probabilities soaring above 60%, before tapering back down in the fall and winter months. Thus, while January may be limited in sunshine, it heralds a shift towards brighter days just around the corner.
In Siena, Italy, January marks the beginning of the year with just 9 hours of daylight, a reminder of winter's grip. As the months progress, daylight begins to unveil its splendor, gradually increasing to 10 hours in February and to 11 hours by March, bringing a sense of renewal as spring approaches. The transformation is most pronounced in April and May, where the daylight stretches to 13 and 14 hours, respectively, inviting residents outdoors to savor the mild temperatures and blooming landscapes. This peak continues into June, offering a generous 15 hours of sunlight, perfect for enjoying the vibrant Tuscan scenery. However, as summer wanes in July and August, daylight starts to recede, returning to 14 and then 13 hours. The decline continues through September, with 12 hours of light signaling the start of fall, leading back to 10 hours in October and ultimately resettling at 9 hours by November and December. This rhythm of daylight variations not only shapes daily life but also embodies the seasonal dance of Siena, punctuating each month with its own unique character.
In January, the winds in Siena, Italy, whisper gently at an average speed of 2.7 m/s (around 6 mph), making it one of the breezier months of the year. As the winter progresses into February and March, the gusts soften slightly, dropping to 2.4 m/s (5 mph), creating a calmness that blankets the historic streets. The gentle return to 2.6 m/s in April and May breathes life back into the blossoming surroundings. However, come summer, the winds ease dramatically, hitting their lowest point of 1.8 m/s (4 mph) in June, before regaining some momentum by July. As the seasons transition back to autumn, the winds pick up again, reaching 2.7 m/s in October, but generally hover around the 5 mph mark through the late year, suggesting a consistent, albeit mild, breeze that enhances Siena’s enchanting atmosphere throughout the year.
The weather in Siena changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Siena and find detailed weather information for every month.
January and February exhibit noticeable differences in weather patterns. In January, temperatures range from a chilly -5°C (23°F) at night to a maximum of 15°C (59°F) during the day, with an average of 5°C (41°F). The month sees around 44 mm (1.7 in) of precipitation over 7 days, coupled with a relatively high humidity of 84%.
February, on the other hand, experiences a slight warming trend, with temperatures dropping to the same minimum of -5°C (23°F) but rising to a pleasant maximum of 20°C (68°F) and an average of 7°C (46°F). Precipitation increases to 68 mm (2.7 in) over 8 days, while humidity decreases to 76%. For more details on February weather, you can visit Siena weather in February.
January and March weather exhibit noticeable differences that reflect the transition from winter to early spring. In January, temperatures range from a minimum of -5°C (23°F) to a maximum of 15°C (59°F), with an average of 5°C (41°F), while humidity remains high at 84%. Precipitation is relatively moderate, with 44 mm (1.7 in) falling over 7 days. By March, the weather warms up, featuring a minimum of -11°C (12°F) and a maximum of 23°C (73°F), with an average temperature of 9°C (49°F). The month sees increased precipitation at 61 mm (2.4 in) across 8 days, although humidity decreases to 68%. For more detailed information about March weather, you can check out Siena weather in March.
January and April in Siena exhibit notable differences in weather conditions. January typically sees cooler temperatures with a minimum of -5°C (23°F) and an average of around 5°C (41°F), while April enjoys a much milder average temperature of 12°C (55°F), reaching a comfortable maximum of 26°C (79°F). In terms of precipitation, January experiences less rainfall at 44 mm (1.7 in) over 7 days, compared to April's 81 mm (3.2 in) spread across 10 days. Additionally, January's humidity is higher at 84%, while April's humidity decreases to 70%, contributing to a more pleasant atmosphere as spring approaches. For more detailed insights, you can check Siena weather in April.
The weather in January is notably colder compared to May, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 15°C (59°F) and an average of 5°C (41°F). In contrast, May offers a much milder climate, characterized by temperatures that range from a minimum of 3°C (37°F) to a warm maximum of 31°C (89°F), with an average of 16°C (62°F). Furthermore, January experiences higher humidity at 84% and less precipitation, with rain falling on about 7 days for a total of 44 mm (1.7 in). May, on the other hand, sees more frequent rainfall over 13 days, contributing to a total of 91 mm (3.6 in) of precipitation, while the humidity decreases to a more comfortable 69%. For more details, you can check Siena weather in May.
In January, Siena experiences a chilly climate with minimum temperatures dropping to -5°C (23°F) and an average temperature of 5°C (41°F), with highs reaching up to 15°C (59°F). With 44 mm (1.7 in) of precipitation over about 7 days, the city also has a high humidity level of 84%, contributing to a damp and cold atmosphere.
In contrast, June brings a warm and inviting climate, with minimum temperatures of 9°C (49°F) and an impressive average of 22°C (71°F), peaking at a scorching 36°C (96°F). The humidity levels drop to a more comfortable 62%, and the precipitation decreases to 38 mm (1.5 in) over just 6 days, making it a favorable month for outdoor activities. For more details on what to expect, check out Siena weather in June.
In January, the weather is considerably colder, with temperatures ranging from a chilly -5°C (23°F) to a mild 15°C (59°F), averaging around 5°C (41°F). This month experiences higher humidity at 84% and about 44 mm (1.7 in) of precipitation over 7 days. In contrast, July showcases a warm and often hot climate, with temperatures ranging from 13°C (56°F) to a scorching 36°C (97°F), averaging 24°C (76°F). Precipitation decreases slightly to 38 mm (1.5 in) over 6 days, and humidity drops to a much more comfortable 57%. For more detailed information about July weather, you can check out Siena weather in July.
In January, temperatures in Siena can dip as low as -5°C (23°F), with an average of 5°C (41°F) and a maximum reaching 15°C (59°F). The month is characterized by higher humidity at 84% and approximately 44 mm (1.7 in) of precipitation over about 7 days, creating a chilly and damp atmosphere. In contrast, August boasts much warmer temperatures, with a minimum of 12°C (53°F), an average of 25°C (77°F), and soaring up to 37°C (99°F). The weather is notably drier, with only 34 mm (1.3 in) of precipitation expected over just 5 days and a comfortable humidity level of 55%. For more detailed insights, visit Siena weather in August.
In January, the weather is considerably colder, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 15°C (59°F), and an average of 5°C (41°F). The month sees about 44 mm (1.7 in) of precipitation over approximately 7 days, accompanied by high humidity levels at 84%. In contrast, September experiences much milder conditions, with temperatures starting at 7°C (45°F) and peaking at 32°C (90°F), averaging around 20°C (69°F). This month also has higher precipitation at 84 mm (3.3 in) over 9 days, but the humidity is notably lower at 66%. For more details on what to expect, visit Siena weather in September.
In January, the weather is colder, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 15°C (59°F), and an average of around 5°C (41°F). The month sees about 44 mm (1.7 in) of precipitation over approximately 7 days, accompanied by high humidity at 84%. In contrast, October boasts milder temperatures, starting from a minimum of 5°C (40°F) and reaching up to 27°C (81°F), with an average of 15°C (59°F). It experiences more precipitation at 91 mm (3.6 in) over 8 days, but with slightly lower humidity at 79%. For a detailed look at the climate, check Siena weather in October.
January and November present distinct weather contrasts, particularly in temperature and precipitation. In January, temperatures range from a chilly -5°C (23°F) at night to a milder 15°C (59°F) during the day, with an average temperature of around 5°C (41°F). On the other hand, November experiences slightly warmer conditions, with minimum temperatures of -3°C (27°F), averaging 11°C (51°F) and peaking at 19°C (66°F). Additionally, November is much wetter, receiving 148 mm (5.8 in) of precipitation over 15 days, compared to January's 44 mm (1.7 in) spread over only 7 days. Both months share a consistent humidity level of 84%. For more detailed insights into November weather patterns, you can check Siena weather in November.
In January, temperatures in Siena range from a chilly -5°C (23°F) to a mild 15°C (59°F), with an average temperature of 5°C (41°F). The month sees about 44 mm (1.7 in) of precipitation over approximately 7 days and maintains a high humidity level of 84%. In contrast, December experiences slightly warmer temperatures, with a minimum of -4°C (25°F) and a maximum of 16°C (61°F), averaging 7°C (44°F). However, it is considerably wetter, with 98 mm (3.8 in) of rainfall spread over 11 days, while humidity remains comparable at 83%. For more details on December’s weather, you can check Siena weather in December.
January in Siena brings a unique chill, making it quite distinct from the milder months that follow. While the city experiences an average temperature of 5°C, the cold can dip to -5°C at night, contrasting sharply with the warmth of spring and summer. The humidity level remains high at 84%, adding to the brisk feel of the air. With about seven days of precipitation and a total of 44 mm of rainfall, January often feels wetter, setting it apart from the drier months ahead. If you seek an authentic experience of Siena's winter charm, this month offers a tranquil beauty, perfect for those who embrace the cold. For more insights on what to expect throughout the year, visit Siena Climate.