The likelihood that the city could see its first-ever September heat alert is another reason summer 2010 will go down in the books as weird and wacky, but wonderful.

With temperatures projected to hit a high of 33 C both today and tomorrow, it’s likely the city’s heat alert — issued Sunday and upgraded to an extreme heat alert yesterday — could carry into September for the first time since the current City of Toronto warning system was put in place in 2001.

Add that to the list of lucky weather factors that made summer in Toronto, by most accounts, idyllic.

For one thing, we had higher than average rainfall — and no one noticed.

At a total of 191.6 mm, June had the highest ever recorded rainfall. July also had higher than normal precipitation.

But according to Environment Canada meteorologist Geoff Coulson, the common perception is that we broke heat records instead. In truth, the average temperature during June, July and August was 21.6 C — the seventh warmest three-month period since weather records began in 1937.

The reason the rain went mostly unnoticed, Coulson says, is that much of the rain fell over night, and was concentrated into the span of fewer days. In June, for instance, nearly one-third of the month’s rain fell June 27.

One of the only downsides to hot conditions, however, is usually an increase in smog. But another one of this summer’s oddities is, despite the hot temperatures, the ministry has issued fewer smog alerts. As of yesterday, only three advisories covering 10 days had been issued in Ontario. Of those, only two have affected Toronto: One was issued yesterday, and the other during a five-day heat wave in July.