Much of south Louisiana, including the Baton Rouge area, has been put under a freeze watch for Thursday evening through Friday morning.

In Baton Rouge, residents woke up Wednesday to temperatures in the low 50s, but by 5 p.m. temperatures had fallen to 46 degrees and were expected to fall to a low of 39 overnight.

According to the National Weather Service, a very cold mass of air is on its way to the area and will lead to what is expected to be the coldest temperatures of the season so far. Low temperatures are likely to drop below freezing along and north of the Interstate 10 and Interstate 12 line Thursday evening.

Below freezing temperatures could last from one to eight hours depending on the location. If the forecast holds true, the National Weather Service could issue a freeze warning.

The weekend won’t get much warmer with low temperatures forecast to get down to 28 degrees Friday night, 49 degrees Saturday night with likely rainfall, and then down to 44 degrees Sunday night.

Lafayette and New Orleans will be a little warmer, but not by much. Temperatures in Lafayette are expected to get down to 30 degrees Thursday night and then 32 degrees Friday evening.

Although New Orleans isn’t included in the freeze warning so far, areas of the north shore are included with temperatures expected to dip below freezing Thursday and Friday evening.

Follow Amy Wold on Twitter @awold10.