Westpac Life Saver Helicopter spokesman Stephen Leahy said campers should heed weather warnings before embarking on trips.
"People need to take those warnings seriously," he told AAP.
"But if you decide you're still going, make sure you tell people where you're going, take adequate food and water and take a distress beacon."
Meanwhile, emergency crews are on stand-by in Sydney.
After more than a week of severe weather, the State Emergency Service (SES) was again kept busy overnight with Sydney's northwest being hit by heavy rain, wind and hail.
The SES received more than 1200 calls overnight, with more 730 jobs generated, a spokeswoman said.
The worst hit areas were Ku-ring-gai, Hornsby, Warringah, Camden and Hawkesbury.
SES crews from the Hunter and Illawarra regions are heading to Sydney to help with the clean up.
Most calls were for roof damage and fallen trees and more than 10,000 homes were left without power on Sunday night.
"I've never seen lightning like it," an SES spokeswoman told AAP.
There have been 11 flood-rescues since Friday, she said.
Sydneysiders can expect more wild weather on Monday, with rain and thunderstorms expected in the afternoon.
The Bureau of Meteorology says there is a 70 per cent chance of showers and a thunderstorm on Monday afternoon, with light winds becoming south to southeasterly 15 to 20km/h late in the day.
Wild weather is forecast for most of the week, however the bureau says it is not expected to be as "intense" as it has been in recent days.
- AAP
