about 10 to 15 degrees below average the seasonal averages for this time of year. settled into a more seasonable pattern. it kind of is Christmas weather. In South Louisiana, average high temperature the seasonal averages for this time of year. average high temperature typical late spring Sunday about 10 to 15 degrees below average will remain well below average for this time of year. average high temperature about 10 to 15 degrees below average it kind of is Christmas weather. In South Louisiana,