Istanbul, along with nearly the entire country, is set to come under the influence of hot air masses originating from both Africa and the Gulf region, according to the Disaster Coordination Center (AKOM), a unit of the Istanbul Metropolitan Municipality responsible for monitoring and coordinating the city's response to natural disasters and severe weather.
AKOM's weekly weather forecast report stated that Istanbul and most of the rest of Türkiye will be affected by these combined heat waves in the coming days, following a period of cooler, rainier weather in the city.
The system is expected to remain in effect over the region for the next seven to 10 days, driving humidity as well as heat. On Monday, humidity levels in Istanbul were expected to range between 40% and 75%, with the poyraz wind, a northeasterly wind common in the region, blowing at moderate to occasionally stronger speeds.
Mostly sunny skies are forecast to prevail across the city throughout the week as the heat wave takes hold. Temperatures are projected to climb starting Monday and continue rising through Thursday, reaching a range of 34 to 36 degrees Celsius (93 to 97 degrees Fahrenheit).
AKOM forecasts daytime highs climbing steadily throughout the week: 31°C on Tuesday, 33°C on Wednesday, and up to 35°C on Thursday, before easing slightly over the weekend to a low of 30°C.
Türkiye's General Directorate of Meteorology said other parts of the country would see a mix of weather this week, with partly cloudy and, in some areas, heavily overcast conditions accompanied by showers and thunderstorms expected in the Lakes Region, the eastern Mediterranean, the interior sections of the western and central Black Sea region, the eastern Black Sea, the northeastern parts of Central Anatolia, and the northern and western parts of Eastern Anatolia.
According to AKOM's weekly forecast, Istanbul can expect clear skies on Tuesday, Wednesday, and Thursday (Aug. 18–20), followed by partly cloudy conditions on Friday, Aug. 21, and mostly clear to slightly cloudy skies over the weekend on Saturday and Sunday, Aug. 22–23.