Not literally, no, but it can be very difficult to concentrate on anything else when you’re suffering under immense heat and a lack of concentration can lead to a figurative brain meltdown.
That being said, the brain is mostly fluid, fat and electric connections so it would DEFINITELY melt long before your bones.
Would have to be around 50-60°C for the 60% of it that’s fat to hypothetically melt if exposed directly to the heat rather than protected by the skull and cooled down by the blood, but that’s nothing compared to the 1670°C melting point of human bones.
Btw, I hope you’re happy with this reply since my Google search history looks rather grisly now 😂