The climate is tropical but mitigated by elevation (Koppen type Cwa), with lower rainfall in winter and annual average temperature of 22.4 °C, with dry and mild winters (rarely too cold) and rainy summers with warm to hot temperatures. The warmest month in February, has an average temperature of 24.9 °C, with an average maximum of 30.0 °C and minimum 19.9 °C. And the coldest month, July, 18.5 °C and 24.8 °C and 12.3 °C average maximum and minimum, respectively. Fall and spring are transitional seasons.
The average annual rainfall is 1424.5 mm and the driest month in August, when there are only 22.9 mm. In January, the rainiest month, the average is 280.3 mm. In recent years, however, the hot, dry days during the winter have been increasingly frequent, often surpassing 30 °C, especially between July and September. In August 2010, for example, the rainfall in Campinas was only 0 mm. During the dry season and long dry spells in the middle of the rainy season are also common records of fires in the hills and thickets, especially in rural areas of the city, which contributes to deforestation and the release of pollutants into the atmosphere, further damaging the quality air. The lowest temperature recorded in the city was −1.5 °C on June 25, 1918. The highest temperature was 39.0 °C, observed on 17 November 1985. The highest cumulative rainfall recorded in 24 hours in the city between June 1988 and October 2008 was 143.4 mm in 25 days May 2005. Between 1890 and 2004 there were 41 occurrences of frost in Campinas. The most recent was on July 18, 2000, when the minimum temperature reached 2.2 °C. There are also occasional episodes of strong winds, with gusts exceeding 100 km / h, and training records were made in the city day May 4, 2001 and March 9, 2008.
The wet season is from mid-October to mid-April, with heavier rains particularly in December, January, February and early March, and the dry season is from mid-May to mid-September. Average
