Many rural communities are joining in prayers for rain. The first week of September saw an interdenominational pray for rain service in Bourke. And the same happened in Orange the last week of August. Across Queensland prayers for rain were held on 1 July https://www.eternitynews.com.au/australia/mayors-urge-nation-to-pray-for-rain/
Anglican Deans in conference joined in prayers for rain in August. https://cathedral.org.au/2018/08/08/australian-deans-reflect-on-resilience-and-wellbeing-call-for-prayer-for-rain-in-nsw-and-queensland/
The following prayer, written by Archbishop Davies, was used at the conference and at St Andrew’s Cathedral:
Our heavenly Father, we acknowledge our ingratitude when we have taken your goodness for granted, when the heaven has poured forth rain and the earth has produced its fruit. Yet now we cry to you for help, as the drought in New South Wales and Queensland deepens. Have mercy on our land; have mercy on the people of the land. May your bountiful hand send forth rain upon our parched earth. Fulfil your promises that while the earth remains, seedtime and harvest shall not cease, so that those in remote and rural areas may find relief from their distress and glorify your name for the provision of their needs. We ask this in the name of our Saviour, Jesus Christ. Amen.
On 2 September in Sydney at St Andrews Archbishop Davies preached with this prayer. https://sydneyanglicans.net/news/trusting-in-god-in-drought
Other suitable prayers may be found in A Prayer Book for Australia (p. 205) and An Australian Prayer Book (p. 92).
Shower, O heaven, from above,
and the skies rain down righteousness;
let the earth open and bring forth salvation.
Isaiah 45:8