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New Orleans: Annual Weather Averages. July is the hottest month in New Orleans with an average temperature of 28Â°C (82Â°F) and the coldest is January at 13Â°C (55Â°F) with the most daily sunshine hours at 12 in June. The wettest month is July with an average of 168mm of rain.The best month to swim in the sea is in July when the average sea temperature is 30Â°C (86Â°F).he wettest month is July with an average of 168mm of rain. The best month to swim in the sea is in July when the average sea temperature is 30Â°C (86Â°F).
New Orleans Temperatures: Averages by Month. The numbers here tell you how hot and cold the weather usually is in New Orleans, Louisiana during each month of the year. The average high and low temperatures are listed below, monthly and annually for New Orleans, in both degrees Fahrenheit and Celsius.Maximums and minimums are only part of the temperature picture.o fill in the rest, there's information on how many days a month get above or below a given temperature. To find out how often it rises over 70, 80 or 90 Â°F each month in New Orleans, scroll down farther.