Kocaeli Temperature by Month
Kocaeli in Marmara Region, Turkey sees significant seasonal temperature differences, with daytime highs between 9°C (48°F) in January and 29°C (84°F) in August, averaging 19°C (66°F) annually. Explore the full monthly breakdown below.
Kocaeli Monthly Temperatures
Visitors to Kocaeli will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 19°C (66°F) in August to 1°C (34°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Kocaeli by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. August, the city's warmest month, averages 271 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Kocaeli vs Turkey
The map below shows the annual temperature across Turkey. You can also select individual months if you want to compare a specific time of year.
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Kocaeli vs World: Temperature Compared
Kocaeli's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Kocaeli's weather — including monthly rainfall, sunshine hours, and humidity — visit our Kocaeli climate page.
