Last updated: August 23, 2025
In December, the average temperature in San Sebastian, Guatemala is a warm 26°C (80°F). You'll experience a range from a mild minimum of 19°C (67°F) to a sizzling maximum of 34°C (94°F). Expect about 26 mm (1.0 in) of precipitation over 6 days, accompanied by an average humidity level of 76%. Prepare for a cozy yet vibrant atmosphere!
In December in San Sebastian, the average temperature is 26°C (80°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 19°C (67°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.
In San Sebastian in December, the precipitation amount is 26 mm (1.0 in) over the course of 6 days.
In San Sebastian in December humidity is 76%. With an average temperature of 26°C (80°F), this humidity feels like a heavy blanket enveloping you, making travel feel stifling and exhausting as you navigate the sticky air and sweat-drenched clothes.
In San Sebastian in December, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Sebastian.
UV Risk Categories
Weather in San Sebastian varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Sebastian, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 26°C (79°F) | 24 mm (1.0 inches) | 76% | very high |
| February Weather | 27°C (81°F) | 18 mm (0.7 inches) | 68% | extreme |
| March Weather | 28°C (82°F) | 44 mm (1.7 inches) | 59% | extreme |
| April Weather | 28°C (83°F) | 105 mm (4.1 inches) | 57% | extreme |
| May Weather | 27°C (81°F) | 447 mm (17.6 inches) | 65% | extreme |
| June Weather | 27°C (80°F) | 373 mm (14.7 inches) | 66% | extreme |
| July Weather | 27°C (81°F) | 292 mm (11.5 inches) | 75% | extreme |
| August Weather | 27°C (80°F) | 362 mm (14.3 inches) | 82% | extreme |
| September Weather | 26°C (80°F) | 418 mm (16.5 inches) | 82% | extreme |
| October Weather | 26°C (79°F) | 378 mm (14.9 inches) | 83% | extreme |
| November Weather | 27°C (80°F) | 106 mm (4.2 inches) | 80% | very high |
| December Weather | 26°C (80°F) | 26 mm (1.0 inches) | 76% | very high |