Why Does Increasing Temperature Increase Rate Of Photosynthesis?

Why Does Increasing Temperature Increase Rate Of Photosynthesis? Temperature – Increasing the temperature increases the rate of photosynthesis because more energy is provided. However, if the temperature is increased to above about 45°C, the enzymes that catalyse (speed-up) the reaction begin to denature (not work anymore). Why does temperature affect the rate of photosynthesis? Temperature.