Voltage changes will differ from site to site depending on when and how customers use their electricity. For example, your neighbour might have an appliance which needs more electricity to power it than what you may have at your property. Or you might have some neighbours which feed solar into the wires in your street. This impacts the power flow and causes differences in your local network.
Most customers will remain within regulated voltage limits, which are within a range of 216-253 volts.