Istanbul Climate Guide to the Average Weather & Temperatures with Graphs Elucidating Sunshine and Rainfall Data & Information about Wind Speeds & Humidity:

• Istanbul, Turkey latitude & longitude; 40°58'N 29°5'E.
• Altitude; 40 m (131 ft).
• The average temperature in Istanbul, Turkey is 14.1 °C (57 °F).
• The range of average monthly temperatures is 18 °C.
• The warmest average max/ high temperature is 28 °C (82 °F) in July & August.
• The coolest average min/ low temperature is 2 °C (36 °F) in February.
• Istanbul receives on average 439 mm (17.3 in) of precipitation annually or 37 mm (1.4 in) each month.
• On balance there are 97 days annually on which greater than 0.1 mm (0.004 in) of precipitation (rain, sleet, snow or hail) occurrs or 8.1 days on an average month.
• The month with the driest weather is August when on balance 24 mm (0.9 in) of rain, sleet, hail or snow falls across 4 days.
• The month with the wettest weather is May when on balance 78 mm (3.1 in) of rain, sleet, hail or snow falls across 6 days.
• Mean relative humidity for an average year is recorded as 75.4% and on a monthly basis it ranges from 70% in July & August to 80% in January, November & December.
• There is an average range of hours of sunshine in Istanbul of between 2.6 hours per day in January and 11.6 hours per day in July.
• On balance there are 2421 sunshine hours annually and approximately 6.6 sunlight hours for each day.
• On balance there are 25 days annually registering frost in Istanbul and in January there are on average 8 days with frost.

Istanbul Climate Graph (Metric | Imperial units)