Last updated: August 23, 2025
In December, the average temperature in San Juan Opico, El Salvador sits at a comfortable 26°C (79°F). Expect a minimum of 16°C (61°F) and a maximum soaring to 36°C (98°F). With an average humidity of 66%, the climate remains relatively pleasant. Notably, precipitation averages only 2 mm (0.1 in) over 0 days, making this a great time to enjoy outdoor activities without the worry of rain!
In December in San Juan Opico, the average temperature is 26°C (79°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 16°C (61°F). This makes it an ideal time for travelers looking to enjoy warm weather while also having the option for cooler evenings.
In San Juan Opico in December, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.
In San Juan Opico in December, humidity is 66%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making outdoor activities invigorating yet requiring occasional breaks in the shade to stay comfortable while traveling.
In San Juan Opico 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 Juan Opico.
UV Risk Categories
Weather in San Juan Opico varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Juan Opico, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 26°C (78°F) | 1 mm (0.1 inches) | 63% | extreme |
| February Weather | 27°C (81°F) | 2 mm (0.1 inches) | 62% | extreme |
| March Weather | 28°C (82°F) | 1 mm (0.0 inches) | 59% | extreme |
| April Weather | 29°C (84°F) | 16 mm (0.6 inches) | 59% | extreme |
| May Weather | 28°C (83°F) | 125 mm (4.9 inches) | 59% | extreme |
| June Weather | 27°C (80°F) | 171 mm (6.7 inches) | 68% | extreme |
| July Weather | 28°C (83°F) | 58 mm (2.3 inches) | 77% | extreme |
| August Weather | 28°C (82°F) | 91 mm (3.6 inches) | 79% | extreme |
| September Weather | 27°C (81°F) | 155 mm (6.1 inches) | 77% | extreme |
| October Weather | 26°C (80°F) | 128 mm (5.1 inches) | 77% | extreme |
| November Weather | 26°C (79°F) | 35 mm (1.4 inches) | 75% | very high |
| December Weather | 26°C (79°F) | 2 mm (0.1 inches) | 66% | very high |