"El NiÃ±o–Southern Oscillation (ENSO) indicators have shown a steady trend towards El NiÃ±o levels since the start of the year. Sea surface temperatures in the tropical Pacific Ocean have exceeded El NiÃ±o thresholds for the past month, supported by warmer-than-average waters below the surface. Trade winds have remained consistently weaker than average since the start of the year, cloudiness at the Date Line has increased and the Southern Oscillation Index (SOI) has remained negative for several months. These indicators suggest the tropical Pacific Ocean and atmosphere have started to couple and reinforce each other, indicating El NiÃ±o is likely to persist in the coming months.You can see an animation of the last 50 days of ENSO-responsive SST here.
International climate models surveyed by the Bureau indicate that tropical Pacific Ocean temperatures are likely to remain above El NiÃ±o thresholds through the coming southern winter and at least into spring."
Sou has more on the story here.
ps In terms of Arctic sea ice, 2015 has been lately well ahead in melting of most recent years. It has just passed 2006 (which is fading after an early spurt) to have the least ice for this day (12 May).