Ruben, that's tough temps. we are forecast for sub 100 this week. When the pumpkins shutdown in the heat will they start growing if the plant is holding up after cool down?
If there is a plant, and the leaves and roots are fine, with good temperatures it will grow a little better. But when a pumpkin has lost its rhythm, the plant has found another sink, it is not easy to make it fatten better. What you can do is give it anti-stress products, and encourage it, and enhance some fertilisers, to improve photosynthesis as much as possible