Calculate the final temperature and the amount of maize distributed to customers.

$$36^\circ\text{C} + 1^\circ\text{C} = 37^\circ\text{C}$$

The final temperature of the patient is $\boxed{37^\circ\text{C}}$.

4. How many kilograms of maize did each customer receive?

$$\text{Initial bags} = 350$$ $$\text{Weight per bag} = 90 \text{ kg}$$ $$\text{Initial total mass} = 350 \text{ bags} \times 90 \text{ kg/bag} = 31500 \text{ kg}$$

$$\text{Bags sold day 1} = 120$$ $$\text{Bags sold day 2} = 50$$ $$\text{Total bags sold} = 120 + 50 = 170 \text{ bags}$$

$$\text{Bags purchased} = 80$$ $$\text{New total bags} = 180 + 80 = 260 \text{ bags}$$

$$\text{Number of customers} = 5$$ $$\text{Mass per customer} = \frac{23400 \text{ kg}}{5} = 4680 \text{ kg}$$

Each customer received $\boxed{4680 \text{ kg}}$ of maize.