Let's get the important part of the forecast out of the way first. Those Mardi Gras parades today in Baton Rouge!
The weather will be very nice today with a sun/cloud mix and very mild afternoon temperatures. Afternoon highs will reach the low 70°s right as the Krewe of Mystique rolls in downtown. Orion rolls later on in the evening and the weather will remain dry, but you might need the light jacket or sweatshirt as the parade ends as temperatures dip into the upper 50°s.
Saturday's weather will be a great start to the weekend. Unfortunately it doesn't stay that way to end the weekend.
Sunday will see it's fair share of rain. AM t-showers will be likely as a warm front moves north out of the Gulf of Mexico into Southeast Louisiana. During the day we'll continue with off & on sct'd to numerous rain showers. Thanks to the passed warm front, even with the clouds and rain we should see highs in the mid 70°s.
A weak cold front moves by late Sunday bringing slightly cooler air back into the area. Morning lows wills stay pretty stagnant in the mid 50°s to start the next work week. The cold front stalls along coast, so we'll need to keep a mention of rain in the forecast Monday, but most should stay dry. On Tuesday an upper air disturbance will travel along this stalled front triggering sct'd to numerous showers and t-storms. A trough will then move into the area on Wednesday bringing back the feel of winter. Morning lows and daytime highs will be about 10 degrees below normal Wednesday and Thursday.