Average temperatures across the eastern states were above average in May, capping off a particularly warm autumn. According to the Bureau of Meteorology (BoM), autumn 2025 was the warmest on record for Victoria, the second warmest for New South Wales, and the third warmest for South Australia. Earlier in the season, the record temperatures were driven by both higher average maximums and higher average minimums. However, a shift occurred in May, particularly in the southern states (Victoria, South Australia, and Tasmania), where maximum temperatures remained above average, but minimums fell below average – resulting in warmer days but colder nights and frosty mornings.
Despite the relatively mild weather, several days of tight supply-demand conditions emerged in New South Wales during mid-May. These were driven by a combination of planned transmission maintenance, unplanned coal unit outages, and low renewable energy output during the evening peak.
Renewables contributed 38.2% of total electricity generated across the National Electricity Market (NEM) in May.
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