What temperature is best to inflate tyres?

The recommended inflation pressure refers to the cold tyres, if possible. Tyres are considered cold when the vehicle has been parked for three hours or more, or if the vehicle has been driven less than 1.6km at moderate speed. If you would like to test your tyre pressure when they are cold but you happen to live more than 1.6km from a service station, you could buy your own tyre pressure-monitoring gauge from reputable automotive parts retailers.