It's a strong El Niño year, which is associated with / defined as a high sea surface temperature anomaly in part of the tropics. Also everything is just getting worse.

Cus things were bad and were already up against an unnaturally warm yeat and to counteract it we drilled more oil than any other nation at any time in the history of the world.

in addition to the other things people said apparently the shipping industry has cut back on sulfur dioxide that reflects sunlight back to space.