September-like weather arrives Sunday

One of the warmest weeks of the summer will end on September-like note, forecasters say.

A high pressure system, responsible for a more comfortable air mass since Wednesday, will continue to drift off the coastline tonight, allowing a moisture-laden southerly flow to invade the region, according to the National Weather Service. 

Under mostly sunny skies, humidity will be noticeably higher Friday, with temperatures in the lower 80s at the coast and upper 80s inland, according to NOAA. There will be a chance of a shower or thunderstorm.

A tropical air mass will be firmly in place Saturday as a cold front approaches the region. The threat of showers and thunderstorms will increase throughout the day, decreasing overnight from the northwest to southeast as the cold front passes offshore early Sunday, according to the National Weather Service. 

Forecasters say that Sunday will feature much more seasonable conditions as a high pressure system builds in, delivering a cooler and drier air mass with light northerly winds. 

Highs will be in the lower 70s at the beaches and middle to upper 70s inland, according to NOAA.