Gretna (LA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Gretna.
Climate overview of Gretna
The climate in Gretna, Louisiana, United States of America, is marked by large temperature swings across the seasons, ranging from 33°C (91°F) in August to 17°C (63°F) in January.
The city receives considerable rainfall, with around 1715 mm (68 in) annually. July is the wettest month. May is the sunniest month, averaging 9.3 hours of sunshine per day.
Gretna Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gretna — and find the best time to visit.
Monthly Temperature in Gretna
In Gretna, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 33°C (91°F) in August to a moderate 17°C (63°F) in the coolest month, January.
Nights vary from 25°C (77°F) in August to around 7°C (45°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Gretna
Gretna experiences significant rainfall throughout the year, averaging 1715 mm (68 in) of precipitation annually. The climate in Gretna shows significant variation throughout the year. Expect heavy rainfall in July, the wettest month, with an average of 217 mm (8.5 in) of precipitation over 21 rainy days.
In contrast, the driest month November offers drier and sunnier days, with around 75 mm (3 in) of rainfall over 7 rainy days. For more details, please visit our Gretna Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Gretna
For those who appreciate different seasons, Gretna serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 9.3 hours of sunshine daily, and embrace the darker days in January, offering only 5.1 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Gretna
The mean water temperature over the year ranges from 20°C (68°F) in January to 28°C (82°F) in June.
Water temperature over the year
Humidity in Gretna by Month
The relative humidity is high throughout the year in Gretna.
The city experiences its highest humidity in July, reaching 79%. In February, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Gretna
The mean wind speed varies between 3 m/s (6 knots) and 5 m/s (10 knots) throughout the year. It is lowest in June, July, August, September and October and highest during February and March. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Gretna
Be prepared for heavier rainfall during July, August and December, the wettest period of the year. Ready to plan your travels but need destination ideas? Our smart tool recommends places based on the climate conditions you prefer. Start planning with our destination weather tool.
Frequently asked questions about the climate in Gretna
What is the best time to visit Gretna?
November typically offers the most optimal weather in Gretna. In contrast, June, July and August tend to have less optimal conditions.
What temperatures can I expect in Gretna?
Daytime highs range from 17°C (63°F) in January to 33°C (91°F) in August. Nighttime lows range from 7°C (45°F) to 25°C (77°F). Temperatures vary considerably through the year.
How much rain does Gretna get?
Annual rainfall is around 1715 mm (68 in). July is the wettest month with 217 mm (8.5 in), while November is the driest with 75 mm (3 in).
How sunny is Gretna?
Gretna receives around 2,640 hours of sunshine per year. May is the sunniest month with 279 hours, while January is the cloudiest with just 152 hours. Overall, Gretna enjoys abundant sunshine.
Gretna 3-Day Forecast
Gretna (LA) 3-Day Forecast
Gretna on the map
Gretna is highlighted — select any city to see its climate.
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