Australia is a relatively safe place to travel by world standards − crime- and war-wise at any rate − but natural disasters regularly wreak havoc. Bushfires, floods and cyclones decimate parts of most states and territories, but if you pay attention to warnings from local authorities and don't venture into affected areas, you should be fine.
The following government websites offer travel advisories and information for travellers.
Australian Department of Foreign Affairs & Trade (www.smartraveller.gov.au)
Canadian Department of Foreign Affairs & International Trade (www.voyage.gc.ca)
French Ministère des Affaires Étrangères et Européennes (www.diplomatie.gouv.fr/fr/conseils-aux-voyageurs)
Italian Ministero degli Affari Esteri (www.viaggiaresicuri.mae.aci.it)
New Zealand Ministry of Foreign Affairs & Trade (www.safetravel.govt.nz)
UK Foreign & Commonwealth Office (www.gov.uk/foreign-travel-advice)
US Department of State (www.travel.state.gov)