Growing marijuana is a complex task. You need to keep an eye on many things and maintain constant conditions in your garden in order not to stress your plants. The temperature is probably the most important component required to achieve the perfect result. To get the well-deserved reward, you need to maintain a temperature of 70-75ºF during the daytime and 50-60ºF at night. These temperature conditions will be perfect for your cannabis, unless you add carbon dioxide to the soil. In this case, the best temperature would be right below 85ºF.