May Weather in Gretna, United States

Last updated: June 24, 2025

In Gretna, United States, the average temperature in May hovers around 20°C (68°F). However, be prepared for temperature swings, with a minimum of 2°C (35°F) and highs reaching up to 35°C (96°F). Expect 118 mm (4.6 inches) of precipitation spread over about 12 days, contributing to an average humidity of 82%. Make sure to pack accordingly!

May Temperature in Gretna

In May in Gretna, the average temperature is 20°C (68°F). Maximum can reach 35°C (96°F), and minimum can be as low as 2°C (35°F). This makes Gretna an ideal destination for travelers seeking pleasant weather with a variety of experiences, from warm days to cooler nights.

May Weather in Gretna: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Gretna, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gretna, May typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (96°F) and lows dropping to around 2°C (35°F).

Data source: Temperature data for Gretna generated using information from the Copernicus Climate Change Service.

May Precipitation in Gretna

In Gretna in May, the precipitation amount is 118 mm (4.6 in) spread over 12 days.

May Precipitation Trends in Gretna

The chart displays monthly precipitation patterns in Gretna, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Gretna, May typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Gretna

In Gretna in May humidity is 82%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit sluggish but surprisingly refreshing, as long as you take breaks in shaded areas to cool off.

May Average Humidity in Gretna

This chart illustrates the average monthly humidity levels in Gretna, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Gretna is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Gretna

In Gretna in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Gretna.

Maximum UV Index Levels in Gretna for May

The chart shows the monthly maximum UV Index (UVI) for Gretna in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Gretna typically reaches 10, which falls under the very high exposure category.

Data source: Gretna May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Gretna Compares to Other Months

Weather in Gretna varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Gretna, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Gretna, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	75 mm (2.9 inches)	84%	moderate
February Weather	7°C (45°F)	112 mm (4.4 inches)	84%	high
March Weather	10°C (50°F)	70 mm (2.8 inches)	84%	high
April Weather	15°C (60°F)	130 mm (5.1 inches)	82%	very high
May Weather	20°C (68°F)	118 mm (4.6 inches)	82%	very high
June Weather	24°C (75°F)	94 mm (3.7 inches)	83%	extreme
July Weather	27°C (81°F)	63 mm (2.5 inches)	79%	very high
August Weather	25°C (78°F)	105 mm (4.1 inches)	77%	very high
September Weather	23°C (73°F)	109 mm (4.3 inches)	75%	very high
October Weather	17°C (63°F)	110 mm (4.3 inches)	81%	high
November Weather	9°C (49°F)	78 mm (3.1 inches)	87%	moderate
December Weather	6°C (44°F)	104 mm (4.1 inches)	85%	moderate