Last updated: August 27, 2025
Istanbul in December offers a unique blend of cool temperatures and significant moisture, characterized by an average temperature of 10°C (50°F). Visitors can expect maximum highs around 18°C (64°F) and chilly lows dipping to 1°C (34°F). Rainfall is prevalent, with a total precipitation of 108 mm (4.2 in) spread across approximately 15 days, contributing to a damp atmosphere and 85% humidity. This month is ideal for those who appreciate the charm of the city shrouded in winter’s embrace, as the weather sets a cozy backdrop for exploring Istanbul’s rich history and vibrant culture.
In December, Istanbul experiences its transition into the winter season, marked by cooler temperatures that linger between a minimum of 1°C (34°F) and a maximum of 18°C (64°F). The average temperature rests comfortably at 10°C (50°F), providing a refreshing chill that contrasts with the milder autumn months preceding it. As the year winds down, visitors can expect to trade the warm sunshine of late autumn for a crisp air, perfect for exploring the city’s historic streets adorned with festive decorations. This gradual decline in temperature sets the stage for the cozy atmosphere of Istanbul in winter, making it an enchanting time to experience the city's culture and warmth amidst the chill.
December in Istanbul marks a noteworthy shift in precipitation patterns, as the city experiences its highest rainfall of the year with 108 mm (4.2 in) over 15 days. This surge contrasts sharply with the drier summer months, particularly August, which only sees 18 mm (0.7 in) across just 3 days. As winter sets in, the increased precipitation not only enriches the local waterways but also highlights the transition from the relatively dry autumn months of October and November, with their respective 56 mm (2.2 in) and 63 mm (2.5 in) of rain. The overall trend underscores December's role as a pivotal month in Istanbul's annual climate, setting the stage for the wetter winter season ahead.
In December, Istanbul experiences a noticeable uptick in humidity, climbing to 85%, which is the highest level since the start of the year. This rise marks a distinct shift from the drier summer months, where humidity dipped as low as 55% in August. As the city transitions from November’s 82%, the cooler winter temperatures seem to foster a more humid environment, creating an overall trend of increased humidity as the year wraps up. This December humidity not only emphasizes the city's unique climatic variations but also highlights the contrast between the dry summer and the damp winter months, underlining Istanbul's diverse weather patterns.
In December, Istanbul experiences a notable shift in its UV Index, dropping to a low level of 2, which allows for a more leisurely outdoor experience with a burn time of 45 minutes. This month's UV exposure contrasts sharply with the very high levels seen in the summer months, such as June and July, where a mere 15 minutes of sun could lead to burns. As the year progresses, the trend clearly shows the peak UV indexes in late spring and summer, moving through moderate levels in early winter and culminating in a low December index. By understanding these trends, visitors can enjoy Istanbul's winter beauty while minimizing sun exposure risks. For more detailed insights, check out the Istanbul UV Index.
UV Risk Categories
As December rolls into Istanbul, it brings a cozy yet vibrant charm with a respectable 213 hours of sunshine. While this marks a decline from the sun-drenched summer months of July and June, when the city basked in nearly 428 and 411 hours of sunlight respectively, it is still a delightful improvement compared to the dimmer days of November. The daylight begins to wane as winter approaches, but with each passing month, Istanbul showcases a gradual increase in sunshine hours leading up to that peak summer brilliance, suggesting a city that sparkles even in the cooler months. In December, the softer sunlight enhances the historic architecture, inviting both residents and visitors to experience the enchanting atmosphere of this magnificent city, where sunshine and stunning sights converge beautifully.
In December, Istanbul experiences a 33% chance of sunny weather, marking a slight dip as the year winds down. This is part of a discernible trend where the likelihood of sunny days peaks in the summer months, with July and August seeing soaring chances of 79% and 82% respectively. As autumn transitions into winter, the chances of sunshine reduce significantly from the spring's higher rates, like 57% in May and 42% in February. While December is not renowned for its sunshine, the city's climate offers a mix of occasional bright days amidst the cooler, overcast skies, making each glimpse of sunshine a pleasant surprise during this month.
In Istanbul, the December daylight duration offers a compelling glimpse into the city's seasonal rhythm. As daylight wanes from the longer days of summer, December sees a return to 9 hours of light, mirroring the limited glow of January and November. This consistency highlights the city's transitional nature as it moves from the longer days of June’s 15 hours toward the farther reaches of winter. With daylight gradually increasing in the following months, the promise of brightening days ahead brings a sense of anticipation — the vibrant awakening of spring just around the corner.
As winter settles in, December's winds in Istanbul pick up the pace, averaging a brisk 5.2 m/s (12 mph). This increase mirrors a broader trend observed in the city's wind patterns, with the months leading into winter typically showcasing a gradual escalation in wind speed. Notably, December's winds align with October's peak, hinting at a seasonal shift that invigorates the air. Previously, the spring months, while milder, saw lower averages, particularly in April and May when gusts hovered around 4.1 m/s (9 mph) and 4.0 m/s (9 mph). As the year closes, the December breeze carries a refreshing chill, reminding residents and visitors alike of Istanbul's dynamic climate, echoing the city’s vibrant spirit even in the depths of winter.
Weather in Istanbul varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Istanbul, focusing on differences in temperature, rainfall, humidity, and UV levels.
December and January present a notable shift in weather conditions. In December, temperatures range from a minimum of 1°C (34°F) to a maximum of 18°C (64°F), with an average of 10°C (50°F). This month experiences more rainfall, with 108 mm (4.2 in) spread over 15 days, coupled with high humidity at 85%. In contrast, January sees cooler temperatures, with a minimum of -3°C (27°F) and an average of 7°C (45°F), while the maximum reaches 16°C (62°F). Precipitation slightly decreases to 102 mm (4.0 in) across 13 days, and humidity remains relatively stable at 84%. For more detailed insights, you can check Istanbul weather in January.
December and February in Istanbul offer distinct weather experiences. In December, temperatures range from a minimum of 1°C (34°F) to a maximum of 18°C (64°F), with an average of 10°C (50°F), making it relatively mild but quite humid at 85%. The month also sees a fair amount of rain, accumulating to 108 mm (4.2 in) over about 15 days.
In contrast, February features slightly cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 17°C (62°F), averaging around 8°C (46°F). Precipitation decreases to 66 mm (2.6 in) spread over 12 days, while humidity remains comparable at 84%. For a more detailed look at February weather in Istanbul, you can refer to Istanbul weather in February.
December and March in Istanbul exhibit distinct weather characteristics. In December, temperatures range from a minimum of 1°C (34°F) to a maximum of 18°C (64°F), with an average of 10°C (50°F). The month is relatively wet, experiencing 108 mm (4.2 in) of precipitation across 15 days, contributing to a high humidity level of 85%. In contrast, March sees slightly cooler temperatures, with a minimum of -2°C (29°F) and a similar maximum of 18°C (65°F), averaging around 8°C (47°F). Precipitation decreases to 82 mm (3.2 in) over 12 days, resulting in a marginally lower humidity of 83%. For more detailed insights, check out Istanbul weather in March.
December and April exhibit distinct differences in weather patterns. In December, temperatures range from a chilly 1°C (34°F) to a mild 18°C (64°F), with an average of 10°C (50°F). This month also sees considerable precipitation, totaling 108 mm (4.2 in) over 15 days, and higher humidity at 85%. In contrast, April brings slightly warmer conditions, with temperatures varying from a minimum of 4°C (40°F) to a maximum of 23°C (73°F), and an average of 12°C (53°F). Precipitation decreases significantly to 49 mm (1.9 in) over just 8 days, along with lower humidity levels at 76%. For more detailed information, you can check Istanbul weather in April.
December weather presents a cool and damp atmosphere, with average temperatures ranging from a chilly 1°C (34°F) to a mild 18°C (64°F). The month sees considerable precipitation, with 108 mm (4.2 in) of rain spread over 15 days, resulting in a high humidity level of 85%. In contrast, May marks a transition to warmer and drier conditions, featuring temperatures that fluctuate between a comfortable 8°C (46°F) and a pleasant 27°C (82°F). With only 50 mm (2.0 in) of precipitation across 8 days and a lower humidity of 77%, May offers a more inviting climate for outdoor activities. For a detailed view of Istanbul's climate during this month, check Istanbul weather in May.
December and June present stark contrasts in weather. In December, temperatures range from a chilly minimum of 1°C (34°F) to a maximum of 18°C (64°F), with an average of 10°C (50°F). The month experiences significant precipitation, totaling 108 mm (4.2 in) over approximately 15 days, accompanied by a high humidity level of 85%. In contrast, June showcases milder conditions, with temperatures starting at a minimum of 13°C (56°F) and peaking at 30°C (86°F), averaging around 22°C (71°F). Rainfall significantly decreases to 40 mm (1.6 in) spread over just 7 days, and humidity levels drop to a more comfortable 70%. For more details, check out Istanbul weather in June.
When comparing the weather in December and July, stark contrasts emerge. December features cooler temperatures, with a minimum of 1°C (34°F) and an average of 10°C (50°F), while July boasts much warmer weather, with temperatures ranging from a minimum of 18°C (65°F) to an average of 24°C (76°F) and reaching highs of 33°C (92°F). Precipitation is more frequent in December, totaling 108 mm (4.2 in) over 15 days, compared to July's 53 mm (2.1 in) across just 5 days. Additionally, humidity levels are significantly higher in December at 85%, contrasted with July's 63%. For more details on July weather, visit Istanbul weather in July.
December and August present stark contrasts in weather patterns. December features cooler temperatures, with an average of 10°C (50°F) and maximums reaching only 18°C (64°F), while August is significantly warmer, boasting an average temperature of 25°C (77°F) and peaks of up to 34°C (93°F). Precipitation also varies greatly; December sees 108 mm (4.2 in) spread across approximately 15 days, making it a much wetter month, whereas August experiences only 18 mm (0.7 in) of rain over just 3 days. Furthermore, the humidity in December is higher at 85%, compared to a more comfortable 55% in August. For more details about August weather, you can check Istanbul weather in August.
In comparing the weather of December and September, a stark contrast emerges. December experiences much cooler temperatures, with a minimum of 1°C (34°F) and an average of 10°C (50°F), whereas September enjoys milder conditions, boasting a minimum of 13°C (57°F) and an average of 22°C (72°F). Precipitation is notably higher in December, with 108 mm (4.2 in) spread across 15 days, compared to just 36 mm (1.4 in) over 6 days in September. Additionally, December's humidity averages around 85%, creating a damp chill, while September's humidity is more comfortable at 60%. For a detailed look at September's weather, refer to Istanbul weather in September.
In comparing December and October weather, it's evident that December is much cooler and wetter than October. December sees average temperatures ranging from a chilly 1°C (34°F) at night to a mild 18°C (64°F) during the day, while in October, temperatures are notably warmer, ranging from a minimum of 10°C (50°F) to a maximum of 28°C (82°F). Precipitation also significantly increases in December with 108 mm (4.2 in) over 15 days, compared to October's 56 mm (2.2 in) across just 8 days. Additionally, humidity levels rise in December to 85%, compared to October's 73%. For more specifics about October weather, you can refer to Istanbul weather in October.
December weather is generally cooler and wetter compared to November. While temperatures in December range from a minimum of 1°C (34°F) to a maximum of 18°C (64°F) with an average of 10°C (50°F), November offers milder conditions with temperatures varying from a minimum of 7°C (44°F) to a maximum of 22°C (72°F) and an average of 14°C (57°F). Additionally, December sees higher precipitation levels at 108 mm (4.2 in) over 15 days, while November experiences only 63 mm (2.5 in) across 10 days. The humidity also slightly increases in December to 85% compared to 82% in November. For more details on November weather, you can visit Istanbul weather in November.
As December unfolds in Istanbul, the city transforms into a cooler, wetter landscape compared to the warmer months of the year. With the average temperature dropping to a comfortable yet brisk 10°C, residents and visitors alike should prepare for the increased humidity and frequent rainfall, which can be expected on about half of the month's days. This shift creates a unique atmosphere, ideal for cozy indoor activities and exploring the city's rich cultural offerings without the summer crowds. Don't miss the opportunity to experience the charm of Istanbul in December. For more information on the unique climate patterns throughout the year, visit Istanbul Climate.