Top Camping Tips - Mississippi Camping Gems - Mississippi Weather In Mississippi, the weather is warm all year round -- it's just a little warmer in the summer.  Average summertime highs are in the low nineties while winter lows average in the mid thirties.  This highest temperature on record (115 degrees Fahrenheit) was recorded in 1930. Hurricane Katrina Reconstruction work is still underway on the Gulf Coast.  Before you arrive, it's a good idea to call any businesses, restaurants, museums, and sites you have your heart set on seeing to make sure they will be open. You can help the Gulf Coast rebuild by bringing your tourist dollars to this area.