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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).
Weather in New Orleans in June 2018. Expect 32Â°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in New Orleans in June. Check more long-term weather averages for New Orleans in June before you book your next holiday to Louisiana in 2018. 1  New Orleans weather overview. 2  New Orleans monthly weather. 3  New Orleans 5-day forecast. 4  Louisiana holidays. 5  Louisiana map. 6  More destinations. 7  Back to Louisiana.