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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).
October is the dryest month of the year in New Orleans but you can still expect rain on 7 days, with the average monthly rainfall being around 89mm. There are around still around 8 hours of average daily sunshine. October is a great time to visit New Orleans as it is slightly quieter than in the summer, and the milder temperatures mean it is not so overwhelming.