January Weather in Gretna, United Kingdom

Last updated: August 27, 2025

In Gretna, United Kingdom, the average temperature in January hovers around 4°C (40°F), with a chilling minimum of -8°C (17°F) and a milder maximum of 13°C (56°F). Expect 73 mm (2.9 in) of precipitation over about 11 days, creating a damp atmosphere with an average humidity of 90%. Be prepared for brisk, wet conditions that characterize this time of year!

January Temperature in Gretna

In January in Gretna, the average temperature is 4°C (40°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -8°C (17°F). Be sure to pack warm clothing and layers if you plan on visiting during this time.

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

The chart illustrates January 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, January typically has an average temperature of 4°C (40°F), with highs reaching up to 13°C (56°F) and lows dropping to around -8°C (17°F).

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

January Precipitation in Gretna

In Gretna in January, the precipitation amount is 73 mm (2.9 in), spread over 11 days.

January Precipitation Trends in Gretna

The chart displays monthly precipitation patterns in Gretna, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Gretna, January typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Gretna

In Gretna in January humidity is 90%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that penetrates your clothes, making even short excursions outside seem uncomfortable and uninviting.

January Average Humidity in Gretna

This chart illustrates the average monthly humidity levels in Gretna, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Gretna is approximately 90%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Gretna

In Gretna in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Gretna.

Maximum UV Index Levels in Gretna for January

The chart shows the monthly maximum UV Index (UVI) for Gretna in January, 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 January, the maximum UV index in Gretna typically reaches 1, which falls under the low exposure category.

Data source: Gretna January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	73 mm (2.9 inches)	90%	low
February Weather	5°C (41°F)	117 mm (4.6 inches)	88%	low
March Weather	6°C (43°F)	98 mm (3.9 inches)	86%	moderate
April Weather	8°C (46°F)	40 mm (1.6 inches)	85%	moderate
May Weather	11°C (52°F)	60 mm (2.4 inches)	80%	high
June Weather	14°C (58°F)	95 mm (3.7 inches)	83%	very high
July Weather	16°C (61°F)	87 mm (3.4 inches)	82%	very high
August Weather	15°C (59°F)	113 mm (4.5 inches)	82%	high
September Weather	13°C (55°F)	85 mm (3.3 inches)	88%	moderate
October Weather	10°C (50°F)	124 mm (4.9 inches)	90%	moderate
November Weather	7°C (45°F)	87 mm (3.4 inches)	92%	low
December Weather	5°C (41°F)	97 mm (3.8 inches)	89%	low