Australia just had its warmest August on record, page-258

The point about the Tonga eruption originally made by walbrook was that in 2022, up to 150 million tonnes of water vapour were emitted into the stratosphere, something like 10% of the total water vapour in the atmosphere. This is much, much larger than the "average" undersea volcano.

It also coincided with a large spike in UAH global temperature from 2023 until now.

Having Googled it a bit all I have found is that scientists have estimated the increase in WV due to the eruption would cause something like 0.05 - 0.08 C increase in GT for 2-3 years. The current anomaly is over 0.8 C.

WUWT, the sceptic's go-to site just points it out as a possibility i.e. correlation means causation - but I've yet to see any which propose that it could cause a 0.5 C increase.

And the water was in the stratosphere, and whether it acts as the same GHG there as in the troposphere - who knows?