The Bay Area began to heat up again Monday, just as the final official hours of summer ticked away. The temperature liftoff is likely to bring the hottest places into the upper 90s and the usually comfortable places into the 80s, a heat-up that will be complemented by a healthy humidity.

It is not likely to last long. By Wednesday, isolated rain storms with the chance of occasional lightning and thunder is set to roll into the region, according to the National Weather Service. After a couple of those inclement days, overcast sky with temperatures more in keeping with the autumn — which officially starts at 11:19 a.m. Monday — are forecast to arrive.

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Sound like a carbon copy of the the previous Bay Area weather week?

“Yes,” NWS meteorologist Roger Gass said. “It’s a dif

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