Just ahead of a weekend that brings sunny skies, a chilly Saturday and more moderate Sunday, comes a shot of “the coldest air of the season,” as described by the National Weather Service’s Upton office on its Facebook page.

In fact, with an overnight dip to lows in the 30s, a freeze warning is in effect for western Suffolk County for 3 a.m. to 8 a.m. Saturday. Crops and other sensitive vegetation there are at risk of being killed, thanks to the freezing temperatures, the weather service said.

Oh, and breezy conditions and resulting wind chill will make conditions feel colder, still, right up to around sunrise, said Joe Pollina, weather service meteorologist, based in Upton.

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Saturday starts on a “cold note,” moving up to highs in the upper 40s to near 50, the weather service said. Again, overnight lows are expected in the 30s but not quite as low as those the night before, Pollina said.

Sunday, also with sunny skies, “will quickly rebound to slightly above normal,” the weather service said, with highs in the mid to upper 50s.