Last updated: June 24, 2025
In December, the average temperature in San Leon, United States is a pleasant 15°C (59°F). However, temperatures can swing from a chilly -1°C (31°F) to a warm 27°C (81°F). The region experiences an average precipitation of 104 mm (4.1 in) over 9 days, resulting in a high average humidity of 84%. Make sure to pack accordingly!
In December in San Leon, the average temperature is 15°C (59°F). Maximum temperatures can reach up to 27°C (81°F), while minimums can drop as low as -1°C (31°F). This makes San Leon a great destination for travelers seeking mild weather with the possibility of varied experiences in climate.
In San Leon in December, the precipitation amount is 104 mm (4.1 in) over the course of 9 days.
In San Leon in December, humidity is 84%. With an average temperature of 15°C (59°F), this humidity feels like an oppressive blanket wrapping around you, making it challenging to enjoy outdoor activities and travel comfortably.
In San Leon in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in San Leon.
UV Risk Categories
Weather in San Leon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Leon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (55°F) | 78 mm (3.1 inches) | 78% | moderate |
| February Weather | 15°C (59°F) | 86 mm (3.4 inches) | 81% | very high |
| March Weather | 19°C (66°F) | 68 mm (2.7 inches) | 76% | very high |
| April Weather | 21°C (70°F) | 98 mm (3.9 inches) | 79% | extreme |
| May Weather | 25°C (77°F) | 168 mm (6.6 inches) | 79% | extreme |
| June Weather | 28°C (82°F) | 166 mm (6.5 inches) | 74% | extreme |
| July Weather | 28°C (83°F) | 150 mm (5.9 inches) | 71% | extreme |
| August Weather | 29°C (84°F) | 208 mm (8.2 inches) | 68% | extreme |
| September Weather | 27°C (81°F) | 216 mm (8.5 inches) | 73% | very high |
| October Weather | 23°C (73°F) | 121 mm (4.7 inches) | 75% | very high |
| November Weather | 17°C (63°F) | 78 mm (3.1 inches) | 78% | high |
| December Weather | 15°C (59°F) | 104 mm (4.1 inches) | 84% | moderate |