October Weather in Istanbul, Turkey

Last updated: August 27, 2025

In October, Istanbul experiences a delightful transition from the warmth of summer to the crispness of autumn. With a maximum temperature reaching 28°C (82°F) and an average of 18°C (64°F), the city offers a comfortable climate for exploration. However, temperatures can dip to a minimum of 10°C (50°F), reminding visitors to pack layers. The month brings 56 mm (2.2 in) of precipitation over 8 days, adding a refreshing touch to the atmosphere while contributing to the city's vibrant fall foliage. With an average humidity of 73%, October in Istanbul delivers a wonderfully diverse experience, balancing warmth and the enchanting onset of autumn hues.

October Temperature in Istanbul

In October, Istanbul experiences a delightful transition as autumn settles in, bringing with it milder temperatures. The average temperature hovers around 18°C (64°F), with minimums dipping to 10°C (50°F) and maximums reaching a pleasant 28°C (82°F). This month marks a clear shift from the lingering warmth of summer, as daytime highs gradually decrease. With temperatures still comfortable enough for outdoor exploration, it’s an ideal time to enjoy the city's vibrant cultural scene and stunning landscapes, making October one of the best months to experience the charm of Istanbul.

October Weather in Istanbul: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Istanbul, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Istanbul, October typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec444647536371767772645750
Data source: Temperature data for Istanbul generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Istanbul

October in Istanbul marks a transition as the city welcomes the autumn season with increased rainfall. Averaging 56 mm (2.2 in) of precipitation over approximately 8 rainy days, the month showcases a slight uptick from the preceding summer, which saw notably lower levels of rainfall. This pattern reflects the city's gradual shift from the dry, sun-soaked days of summer—where only 18 mm (0.7 in) fell in August—to the wetter months that follow, such as November, which sees an increase to 63 mm (2.5 in). As the landscapes turn vibrant with fall foliage, the gentle rain in October not only revitalizes the natural surroundings but also highlights the seasonal rhythm of Istanbul's climate.

October Precipitation Trends in Istanbul

The chart displays monthly precipitation patterns in Istanbul, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Istanbul, October typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec10267825050405318365663108
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Istanbul

As autumn settles in, October humidity in Istanbul sees a moderate uptick, averaging around 73%. This marks a shift from the dry, warmer summer months, where humidity dipped to a comfortable 55% in August and continued to be relatively low through September. As the city transitions into fall, humidity levels begin to rise again, reflecting the approaching winter. Interestingly, October’s levels are still significantly lower than the winter months, where humidity soars to around 84% in January and February. This trend illustrates a gradual increase in moisture, hinting at the atmospheric changes that herald the advent of more humid weather ahead.

October Average Humidity in Istanbul

This chart illustrates the average monthly humidity levels in Istanbul, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Istanbul is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%83%76%77%70%63%55%60%73%82%85%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Istanbul

As October unfolds in Istanbul, Turkey, the UV Index reaches 6, marking it as a month of high exposure where the sun's rays demand a bit more caution. Just a step down from the peak summer months of June and July—when the index hit a stark 10 and 9 respectively—October offers a relatively safer burn time of 25 minutes. This transitional phase hints at the waning intensity of summer's sunlight, yet it still calls for vigilance, as the UV levels can still be significant. Looking back at the year's pattern, it's evident that the spring and summer months bring higher UV readings, peaking in May. As the autumn season settles in, a gradual decline in UV intensity is expected, making this a pivotal time for sun safety. For more insights on how to protect yourself from UV exposure, visit Istanbul UV Index.

Maximum UV Index Levels in Istanbul for October

The chart shows the monthly maximum UV Index (UVI) for Istanbul in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Istanbul typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3467810997632
Data source: Istanbul October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

October Sunshine in Istanbul

As October unfolds in Istanbul, the city's embrace of autumn is beautifully illuminated by an impressive 305 hours of sunshine. This marks a gentle decline from the vibrant summer months, where July boasts the peak at 428 hours. However, October still shines brightly in comparison to the chill of November, which only sees 247 hours. The sun-soaked days of early fall in Istanbul create a perfect backdrop for leisurely strolls along the Bosphorus, where the lingering warmth lingers, inviting both locals and visitors to bask in the gentle sunlight before winter sets in. As the month progresses, the daylight gradually wanes, but the golden hues of autumn ensure that October remains a captivating time of year in this enchanting city.

Monthly Sunshine Duration in Istanbul: October Highlighted

The October sunshine duration represents the total number of hours Istanbul experiences direct sunlight during the month of October, excluding cloudy or obstructed periods. This chart compares the sunshine duration of October with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec159h232h303h347h401h411h428h399h345h305h247h213h
Data source: Istanbul October Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Istanbul During October

As October rolls in, Istanbul's weather transitions from the vibrant warmth of summer to a more temperate atmosphere, with a 46% chance of sunny days. This month's likelihood of sunshine reflects a notable decline from the peak summer months, where sunshine probabilities soar above 75%. However, October still holds more potential for clear skies compared to the chillier months that follow, with November and December seeing chances drop to 39% and 33% respectively. Overall, while October may not boast the brilliant sunshine of its summer predecessors, it offers a charming blend of mild weather and reasonable potential for sunny days, perfect for enjoying the city's stunning fall scenery.

Percentage of Sunny Days in October in Istanbul

The chart illustrates the percentage of sunny days in Istanbul throughout the year, with October highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Istanbul experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec27%42%40%43%57%60%79%82%58%46%39%33%
Data source: Istanbul October chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Istanbul in October

As October rolls into Istanbul, the city experiences a gentle decline in daylight, with about 11 hours of sunshine gracing its vibrant streets. After a summer rich in daylight, peaking at 15 hours in June, residents begin to notice the shorter days that herald the impending winter. September's 12 hours begins the gradual shift, leading to October's subtle drop, reminiscent of the seasonal transformation in this historic city. This transition paints a picturesque backdrop for the autumn foliage, inviting both locals and tourists to relish the charm of early evening strolls under the softening light. With daylight tapering off again to 9 hours by November, October serves as a key moment to appreciate the lingering warmth of autumn before the nights grow longer.

Average Daylight Hours in Istanbul for October

The chart illustrates the variation in daylight duration in Istanbul throughout the year, with October highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 34m10h 37m11h 57m13h 19m14h 29m15h 4m14h 45m13h 44m12h 25m11h 4m9h 52m9h 15m
Data source: Istanbul daylight hours, calculated by summing the hours between sunrise and sunset for each day.

October Winds in Istanbul

As October graces Istanbul, the city's atmosphere begins to shift, marked by a subtle increase in the average wind speed to 5.2 m/s (12 mph). This uptick heralds the onset of autumn, bringing a refreshing breeze that contrasts with the milder summer months, where winds dipped to as low as 3.0 m/s (7 mph) in June. The transition is striking, as October's wind speed reflects a gradual ascent from the more tranquil months of late spring and early summer. Interestingly, this invigorating gust aligns with the winds of January and December, suggesting that the city prepares for the winter chill ahead. As the wind swirls through the streets and along the Bosphorus, it infuses Istanbul with a vibrant energy that is both invigorating and enchanting.

Average October Wind Speed in Istanbul

The chart displays monthly wind speed patterns in Istanbul, with values for each month shown alongside October's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how October's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.84.94.74.14.03.04.44.44.95.2 m/s4.55.2
Data source: Istanbul October wind data, generated using information from the Copernicus Climate Change Service.

How October Weather in Istanbul Compares to Other Months

Weather in Istanbul varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Istanbul, focusing on differences in temperature, rainfall, humidity, and UV levels.

October and January exhibit strikingly different weather patterns. In October, temperatures range from a mild 10°C (50°F) at night to a warm 28°C (82°F) during the day, with an average of 18°C (64°F). Precipitation is moderate at 56 mm (2.2 in) over approximately 8 days, while humidity stands at 73%. In contrast, January experiences much colder temperatures, with minimums dropping to -3°C (27°F) and a maximum of 16°C (62°F), averaging 7°C (45°F). This month also sees increased precipitation at 102 mm (4.0 in) across about 13 days, along with higher humidity levels at 84%. For a more detailed look at January weather, visit Istanbul weather in January.

In comparing the weather of October and February, it is clear that October enjoys milder temperatures, with an average of 18°C (64°F) and daily highs reaching up to 28°C (82°F). In contrast, February experiences much cooler conditions, featuring an average temperature of 8°C (46°F) and maximums only reaching 17°C (62°F). October also has significantly less precipitation, with 56 mm falling over about 8 days, while February sees 66 mm over 12 days, indicating a wetter month. Additionally, humidity levels are higher in February at 84%, compared to October's 73%. For more specifics on February weather, you can check Istanbul weather in February.

October and March present contrasting weather patterns in terms of temperature and precipitation. In October, temperatures range from a mild 10°C (50°F) at night to a warm 28°C (82°F) during the day, with an average of 18°C (64°F). The month experiences around 56 mm (2.2 in) of precipitation spread over 8 days, coupled with a relative humidity of 73%. In stark contrast, March is notably cooler, with temperatures dipping as low as -2°C (29°F) at night and reaching a maximum of 18°C (65°F) during the day, averaging just 8°C (47°F). This month sees higher rainfall, with 82 mm (3.2 in) of precipitation occurring over 12 days and a slight increase in humidity to 83%. For more details on March weather, you can refer to Istanbul weather in March.

In October, temperatures in Istanbul range from a comfortable minimum of 10°C (50°F) to a warm maximum of 28°C (82°F), with an average of 18°C (64°F). The month sees a bit more precipitation at 56 mm (2.2 in) over approximately 8 days, contributing to a humidity level of 73%. In contrast, April experiences cooler temperatures, with a minimum of 4°C (40°F) and a maximum of 23°C (73°F), averaging 12°C (53°F). Precipitation in April is slightly lower at 49 mm (1.9 in), also spread across about 8 days, while humidity is marginally higher at 76%. For more detailed information, check out Istanbul weather in April.

When comparing the weather in October to that of May, it's evident that both months share some similarities and differences. October's temperatures range from a minimum of 10°C to a maximum of 28°C, with an average of 18°C, while May features slightly cooler temperatures, with a minimum of 8°C, an average of 17°C, and a maximum of 27°C. Precipitation is quite similar in both months, with October receiving 56 mm and May getting 50 mm, each experiencing precipitation on approximately 8 days. However, humidity levels are slightly higher in May at 77% compared to October's 73%. For more detailed insights on May weather, you can check Istanbul weather in May.

When comparing the weather in October and June, a few notable differences emerge. October tends to be cooler overall, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 28°C (82°F), whereas June has warmer averages, ranging from 13°C (56°F) to 30°C (86°F). Additionally, October receives slightly more rainfall, averaging 56 mm (2.2 in) over about 8 days, while June sees less precipitation at 40 mm (1.6 in) across approximately 7 days. Humidity levels are fairly similar in both months, with October at 73% and June at 70%. For a closer look at June's climate specifics, you can check out Istanbul weather in June.

When comparing the weather in October and July, October tends to be cooler, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 28°C (82°F), while July enjoys warmer temperatures, with averages from 18°C (65°F) to 33°C (92°F). Additionally, October experiences slightly more precipitation, with 56 mm (2.2 in) over about 8 days, compared to July's 53 mm (2.1 in) over just 5 days. Humidity levels are also higher in October at 73% compared to July's 63%. For more specific details on July weather, you can check this link: Istanbul weather in July.

In comparing the weather between October and August, October tends to be significantly cooler, with average temperatures ranging from a minimum of 10°C (50°F) to a maximum of 28°C (82°F), while August boasts much warmer temperatures, with minimums of 19°C (66°F) and maximums reaching 34°C (93°F). Additionally, October experiences more frequent rainfall, with precipitation occurring on about 8 days and totaling 56 mm (2.2 in), compared to August's relatively dry conditions, where rain falls on only 3 days and accumulates just 18 mm (0.7 in). Humidity levels also differ, with October being more humid at 73%, compared to August's lower 55%. For a detailed look at the weather patterns in August, you can visit Istanbul weather in August.

In comparing the weather of October to September, it becomes evident that October tends to be cooler and wetter. The average temperature in October is around 18°C (64°F), with a maximum of 28°C (82°F), compared to September's higher average of 22°C (72°F) and a peak of 32°C (90°F). Additionally, October experiences more precipitation, with 56 mm (2.2 in) over 8 days, while September sees only 36 mm (1.4 in) over 6 days. Furthermore, the humidity in October is higher at 73%, compared to September's more comfortable 60%. For a closer look at September's weather patterns, you can refer to this link: Istanbul weather in September.

October generally offers warmer temperatures compared to November, with daily averages around 18°C (64°F) and maximums reaching up to 28°C (82°F). In contrast, November sees a notable drop, with average temperatures falling to 14°C (57°F) and highs of only 22°C (72°F). Additionally, while October experiences 56 mm (2.2 in) of precipitation over 8 days, November brings slightly more rain, totaling 63 mm (2.5 in) across 10 days. Humidity levels also rise in November, reaching 82% compared to October's 73%. For more detailed insights, you can check Istanbul weather in November.

October and December present contrasting weather patterns. In October, temperatures range from a minimum of 10°C (50°F) to a comfortable maximum of 28°C (82°F), with an average of 18°C (64°F). The month experiences 56 mm (2.2 in) of precipitation over about 8 days, accompanied by a humidity level of 73%. In stark contrast, December sees significantly cooler conditions, with temperatures dropping as low as 1°C (34°F) and only reaching a maximum of 18°C (64°F), averaging at 10°C (50°F). Additionally, it experiences higher precipitation at 108 mm (4.2 in) across 15 days, along with increased humidity at 85%. For more detailed insights, check out Istanbul weather in December.

Compare Istanbul's Climate with Cities Worldwide

Conclusion: What to Expect From October Weather in Istanbul

As October unfolds in Istanbul, the city transitions into a milder climate, offering a refreshing escape from the scorching summer heat. This month showcases a comfortable average temperature of 18°C (64°F), with pleasant daytime highs reaching up to 28°C (82°F), making it ideal for exploring the vibrant streets and historic sites. However, as autumn sets in, visitors should be prepared for some light rainfall, as October experiences around 8 days of precipitation, totaling 56 mm (2.2 in). The humidity remains significant at 73%, adding a hint of crispness to the air. If you're looking to enjoy Istanbul's beauty without the sweltering heat, October offers a unique and captivating experience. For more detailed information, explore the comprehensive guide on Istanbul Climate.