Like all of Romania, Timișoara exhibits a temperate continental climate, characteristic of the southeastern part of the Pannonian Basin, with some sub-Mediterranean influences. The Köppen climate classification subtype for this climate is Cfb (oceanic climate).
The dominant air masses, during spring and summer, are the temperate ones, of oceanic origin, which bring significant precipitations. Frequently, even in winter, humid air masses arrive from the Atlantic, bringing significant rains and snows, less often cold waves. From September to February there are frequent penetrations of continental polar air masses, coming from the east. However, in Banat the influence of cyclones and hot air masses from the Adriatic Sea and the Mediterranean Sea is also strongly felt, which in winter generate complete thawing and in summer impose periods of stifling heat.
The average annual temperature is 12.4 °C (54.3 °F) (2007), constantly rising. The warmest month, on average, is July with an average temperature of 21.7 °C (71.1 °F). The coolest month on average is January, with an average temperature of −1.7 °C (28.9 °F). The lowest temperature recorded in Timișoara was −35.3 °C (−31.5 °F), on 24 January 1963, while the highest temperature was 42 °C (108 °F), recorded in August 2017. The average number of frost days (with minimum temperatures below 0 °C [32 °F]) is 91, and the average number of winter days (with maximum temperatures below 0 °C) is 22.4. The average number of tropical days (with maximum temperatures above 30 °C [86 °F]) is 40.
Being predominantly under the influence of the maritime air masses from the northwest, Timișoara receives a higher amount of precipitation than the cities in the Wallachian Plain. The average amount of precipitation for the year in Timișoara is 649.2 mm (25.56 in) (2007). The month with the most precipitation on average is June with 81.3 mm of precipitation. The month with the least precipitation on average is January with an average of 40.6 mm (1.60 in). In terms of liquid precipitation, there are an average of 69.1 days of rain, with the most rain occurring in June with 7.6 days of rain, and the least rain occurring in March with five days of rain.