Fares for NSW's Opal ticketing system will rise by 2.2 per cent next month, while the cost of all-day travel for seniors on the public transport network will remain unchanged.

Ahead of the state budget on Tuesday, NSW Transport Minister Andrew Constance said the increase mirrored the rate of inflation and meant that the average impact on passengers was about 39¢ a week, making trains, buses, light rail and ferries cheaper than driving.

The government has again kept the cost of all-day travel for Gold Opal cards used by about 500,000 seniors capped at $2.50.

With the state election just nine months away, the Berejiklian government and Labor opposition have both been trying to cast themselves as the parties that are wanting to put downward pressure on prices for essential household services amid weak wage growth.