Don't let a few balmy days fool you -- it's definitely fall.

While temperatures Sunday and Monday are expected to be above normal for this time of year, a cold front arriving Monday night is predicted to bring rain and a more seasonable chill to much of Long Island, according to meteorologist Joey Picca of the National Weather Service's Upton bureau.

Highs on Sunday will be in the upper 60s, with lows in the upper 50s to 60 degrees -- "much warmer than we've been seeing," Picca said.

Monday's highs will be in the low 70s, but Long Islanders should prepare for a chance of showers in the afternoon that will increase through the evening, Picca said. The area could get a third of an inch of rainfall, he said.

A cold front will come in Monday night, bringing lows in low to mid-50s.

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Tuesday will be a bit chillier, with highs in the low 60s across Long Island, and lows in the 40s.

Wednesday will continue to be cooler, with highs in the low 60s and lows in the upper 40s.

It'll warm up slightly on Thursday, with highs in the mid-60s, and lows in the low 50s, Picca said.

A chance of rain will return on Friday, with temperatures rising to the mid- to upper 60s.