The month of April in Louisiana experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 46% throughout. The weather in Louisiana in March is cold and breezy, with average highs of 55°F (13°C) and lows of 34°F (1°C). 7 mars 2022 · The weather in Monroe in March is mildly cool with a gentle breeze, with average highs of 69°F (21°C) and lows of 48°F (9°C).