Last updated: August 23, 2025
In December, the average temperature in Saint-Jean-d'Illac, France hovers around 8°C (47°F), with a range that can dip to a brisk -5°C (24°F) and soar to a pleasant 18°C (65°F). Expect 125 mm (4.9 in) of precipitation spread over 16 days, accompanied by a high average humidity of 85%. Be prepared for a typical, cozy atmosphere this month!
In December in Saint-Jean-d'Illac, the average temperature is 8°C (47°F), with maximums reaching 18°C (65°F) and minimums dropping as low as -5°C (24°F). This variation in temperature makes it essential for travelers to prepare for both mild and chilly weather.
In Saint-Jean-d'Illac in December, the precipitation amount is 125 mm (4.9 in) spread over 16 days.
In Saint-Jean-d'Illac in December humidity is 85%. With an average temperature of 8°C (47°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities feel less refreshing and more uncomfortable for traveling.
In Saint-Jean-d'Illac in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Saint-Jean-d'Illac, you can visit Hourly UV Index in Saint-Jean-d'Illac.
UV Risk Categories
Weather in Saint-Jean-d'Illac varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Saint-Jean-d'Illac, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (44°F) | 60 mm (2.4 inches) | 85% | low |
| February Weather | 9°C (48°F) | 64 mm (2.5 inches) | 83% | moderate |
| March Weather | 11°C (51°F) | 73 mm (2.9 inches) | 82% | high |
| April Weather | 13°C (56°F) | 66 mm (2.6 inches) | 82% | high |
| May Weather | 17°C (62°F) | 125 mm (4.9 inches) | 82% | very high |
| June Weather | 20°C (68°F) | 97 mm (3.8 inches) | 80% | very high |
| July Weather | 22°C (72°F) | 47 mm (1.8 inches) | 76% | very high |
| August Weather | 22°C (71°F) | 46 mm (1.8 inches) | 73% | very high |
| September Weather | 19°C (67°F) | 58 mm (2.3 inches) | 76% | high |
| October Weather | 15°C (59°F) | 70 mm (2.8 inches) | 81% | moderate |
| November Weather | 10°C (50°F) | 78 mm (3.1 inches) | 83% | moderate |
| December Weather | 8°C (47°F) | 125 mm (4.9 inches) | 85% | low |