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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).
To 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.There are also monthly and yearly counts of nights with warm temperatures days and details on how often it gets cold in New Orleans. All the numbers are averages, based on climate data gathered from 1981 to 2010.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.