The osmotic pressure increases with an increase in temperature and decreases with a decrease in temperature.

Why does osmotic pressure increase with temperature?

The most direct consequence of raising the system temperature is the increased water flux across the membrane due to lowered water viscosity and increased water diffusivity, which effectively increases the water permeability across the membrane.

What causes an increase in osmotic pressure?

Osmotic pressure is affected by concentration and temperature. Concentration of solute and temperature each affect the amount of pressure created by the movement of water across a membrane. Higher concentrations and higher temperatures increase osmotic pressure.