Last updated: August 23, 2025
In December, the average temperature in Oldcastle, Ireland hovers around 6°C (43°F). Expect chilly nights with minimums dipping to -3°C (27°F), while daytime highs can reach up to 13°C (56°F). This time of year also brings about 96 mm (3.8 in) of precipitation over approximately 15 days, contributing to an average humidity level of 84%. Perfect for cozy indoor activities!
In December in Oldcastle, the average temperature is 6°C (43°F), with maximums reaching up to 13°C (56°F) and minimums dropping as low as -3°C (27°F). Be sure to pack layers and prepare for chilly evenings if you're planning to visit during this time!
In Oldcastle in December, the precipitation amount is 96 mm (3.8 in) over the course of 15 days.
In Oldcastle in December, humidity is 84%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor excursions uncomfortable and prompting travelers to seek refuge indoors or find warm, sheltered spots to enjoy their surroundings.
In Oldcastle 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 Oldcastle.
UV Risk Categories
Weather in Oldcastle varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Oldcastle, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (42°F) | 61 mm (2.4 inches) | 85% | low |
| February Weather | 6°C (43°F) | 98 mm (3.9 inches) | 86% | low |
| March Weather | 7°C (44°F) | 89 mm (3.5 inches) | 86% | moderate |
| April Weather | 8°C (47°F) | 52 mm (2.0 inches) | 85% | moderate |
| May Weather | 11°C (53°F) | 72 mm (2.8 inches) | 83% | high |
| June Weather | 14°C (58°F) | 88 mm (3.5 inches) | 85% | very high |
| July Weather | 16°C (60°F) | 82 mm (3.2 inches) | 86% | very high |
| August Weather | 15°C (59°F) | 121 mm (4.8 inches) | 85% | high |
| September Weather | 13°C (56°F) | 77 mm (3.0 inches) | 86% | moderate |
| October Weather | 10°C (51°F) | 86 mm (3.4 inches) | 87% | moderate |
| November Weather | 7°C (46°F) | 90 mm (3.6 inches) | 86% | low |
| December Weather | 6°C (43°F) | 96 mm (3.8 inches) | 84% | low |