Allah's Messenger (ﷺ) said, "The (Hell) Fire complained to its Lord saying, 'O my Lord! My different parts eat up each other.' So, He allowed it to take two breaths, one in the winter and the other in summer, and this is the reason for the severe heat and the bitter cold you find (in weather).
Sahih al-Bukhari Book 59, Hadith 70
← Previous Hadith The Prophet (ﷺ) said, "Delay the (Zuhr) Prayer till it gets cooler, for the severity of heat is from the increase in the heat of Hell (fire).

Sahih al-Bukhari Book 59, Hadith 69 Next Hadith → I used to sit with Ibn `Abbas in Mecca. Once I had a fever and he said (to me), "Cool your fever with Zamzam water, for Allah's Messenger (ﷺ) said: 'It, (the Fever) is from the heat of the (Hell) Fire; so, cool it with water (or Zamzam water).

Sahih al-Bukhari Book 59, Hadith 71