Last updated: August 27, 2025
In December, the average temperature in Brynmawr, United Kingdom hovers around 6°C (42°F), with minimums reaching as low as -8°C (17°F) and maximums peaking at 13°C (55°F). Expect significant precipitation, totaling 129 mm (5.1 in) across approximately 17 days throughout the month, while the air maintains a high average humidity of 89%.
In December in Brynmawr, the average temperature is 6°C (42°F). Maximums can reach 13°C (55°F), while minimums can dip as low as -8°C (17°F). Travelers should be prepared for chilly conditions and pack layers to ensure comfort during their visit.
In Brynmawr in December, the total precipitation amount reaches 129 mm (5.1 in), occurring over a span of 17 days.
In Brynmawr in December humidity is 89%. With an average temperature of 6°C (42°F), this humidity feels like a heavy blanket wrapping around you, making it challenging for traveling as you navigate the damp air that clings to your skin, leaving you longing for a warm, dry refuge.
In Brynmawr in December, 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 Brynmawr.
UV Risk Categories
Weather in Brynmawr varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Brynmawr, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 73 mm (2.9 inches) | 88% | low |
| February Weather | 5°C (41°F) | 112 mm (4.4 inches) | 88% | low |
| March Weather | 6°C (43°F) | 107 mm (4.2 inches) | 86% | moderate |
| April Weather | 8°C (47°F) | 64 mm (2.5 inches) | 84% | high |
| May Weather | 11°C (52°F) | 91 mm (3.6 inches) | 80% | high |
| June Weather | 14°C (58°F) | 89 mm (3.5 inches) | 80% | very high |
| July Weather | 16°C (62°F) | 91 mm (3.6 inches) | 70% | very high |
| August Weather | 15°C (60°F) | 103 mm (4.1 inches) | 73% | high |
| September Weather | 13°C (56°F) | 80 mm (3.1 inches) | 79% | high |
| October Weather | 10°C (51°F) | 132 mm (5.2 inches) | 89% | moderate |
| November Weather | 7°C (45°F) | 104 mm (4.1 inches) | 90% | low |
| December Weather | 6°C (42°F) | 129 mm (5.1 inches) | 89% | low |