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May Weather in Gretna, United Kingdom

Last updated: August 27, 2025

In May, the average temperature in Gretna, United Kingdom hovers around 11°C (52°F). Expect a minimum of -2°C (29°F) and a maximum of 26°C (80°F), offering a wide range of experiences. With an average precipitation of 60 mm (2.4 in) spread across 13 days, it's wise to keep an umbrella handy. The air is quite humid, with an average humidity level of 80%, enhancing that cozy, damp atmosphere.

May Temperature in Gretna

In May in Gretna, the average temperature is 11°C (52°F). The maximum can reach 26°C (80°F), and the minimum can be as low as -2°C (29°F). This makes it a great time for travelers to experience a diverse and pleasant range of weather, perfect for outdoor activities.

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 11°C (52°F), with highs reaching up to 26°C (80°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec394143465257605955504441
Data source: Temperature data for Gretna generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Gretna

In Gretna in May, the precipitation amount is 60 mm (2.4 in) over a span of 13 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 60 mm (2.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec731179840609587113851248797
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Gretna

In Gretna in May, humidity is 80%. With an average temperature of 11°C (52°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as you navigate through the thick, languid air.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Gretna, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865321
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.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)73 mm (2.9 inches)90%low
February Weather5°C (41°F)117 mm (4.6 inches)88%low
March Weather6°C (43°F)98 mm (3.9 inches)86%moderate
April Weather8°C (46°F)40 mm (1.6 inches)85%moderate
May Weather11°C (52°F)60 mm (2.4 inches)80%high
June Weather14°C (58°F)95 mm (3.7 inches)83%very high
July Weather16°C (61°F)87 mm (3.4 inches)82%very high
August Weather15°C (59°F)113 mm (4.5 inches)82%high
September Weather13°C (55°F)85 mm (3.3 inches)88%moderate
October Weather10°C (50°F)124 mm (4.9 inches)90%moderate
November Weather7°C (45°F)87 mm (3.4 inches)92%low
December Weather5°C (41°F)97 mm (3.8 inches)89%low

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