Most serious fires in Australia burn over several days. Areas in which fires are burning are well advertised in the media. If you are planning a trip into an area where there is known to be fire activity, the best plan is to cancel or relocate your trip to somewhere safer.
Severe wildfires occur when weather conditions are conducive to fire spread, i.e. temperature in the mid 30s or higher, relative humidity less than 15% and hot dry winds greater than 30 km/hr. Such days are less than ideal for most outdoor activities, and a decision to defer or relocate the trip or spend the day at a base camp will reduce the risk to bushwalkers from heat stress and sunburn, as well as bushfire.