İznik Temperature by Month

İznik in Marmara Region, Turkey sees significant seasonal temperature differences, with daytime highs between 9°C (48°F) in January and 31°C (88°F) in August, averaging 20°C (68°F) annually. Explore the full monthly breakdown below.

Visitors to İznik 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 İznik by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 271 hours of sunshine.

The chart below shows the average temperature throughout the year:

İznik's average annual maximum temperature is 20°C (68°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.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

For more on İznik's weather, including monthly rainfall, sunshine hours, and humidity, visit our İznik climate page.