Hello Zoe, it’s a good question.
36C is not too hot but in a larger heap that might be 50C.
Yes the compost is still decomposing, I recommend to buy it 2 or more months before using as this often happens with mushroom & green waste compost.
Nonetheless you can use it, only growth will likely be slower. If you have some proper decomposed compost as the top 2in/5cm that will help winter plants.
