Big rains have bolstered the central NSW region's water security heading into summer.

The capacity of Burrendong Dam is up four per cent to just over 18 per cent.

An influx of more than 100,000 megalitres has pushed Wyangala Dam at Cowra up to 45 per cent, while Windamere Dam now sits at 43 per cent.

Tony Webber from Water New South Wales said it was a good sign for a number of communities.

“What's encouraging with these figures is that Burrendong, it was feared it could fall as low as 10 per cent of capacity or lower,” Mr Webber told the ABC.

“It's up around 18 per cent.

“So while they aren't big numbers, they're certainly much better than the worst case scenario we were facing at this time of year.”

But Mr Webber warned that with summer coming, a lot more rain and run off were needed.

“We'd love to see a lot more rain than this and with the dry forecast ahead according to the bureau, you know everybody would like to see more in the storages but they're all heading in the right direction,” he said.

“Every regional storage increased in the last month.”