Hefei's climate is fairly mild, with the four seasons distinctly separated. The average annual temperature is 15.7 degrees C. January, the cities coldest month, has an average temperature of 2.4 degrees C., and the lowest temperature at this time rarely falls below -5. The hottest months are July and August, which between them average 28.4 degrees C.

The city suffers from relatively high rainfall, mostly falling in the transitional periods between spring/summer and summer/autumn. Average number of frost free days in 228 per annum.