Last updated: August 31, 2025
In December, the average temperature in San Bernardino, Paraguay hovers around 27°C (81°F). Expect a range from a cool 15°C (59°F) to a sizzling 38°C (101°F). While you'll enjoy mostly warm weather, be prepared for some rain—with 108 mm (4.2 in) of precipitation expected over 9 days. The air tends to be quite humid, with an average of 84% humidity, creating a tropical atmosphere.
In December, in San Bernardino, the average temperature is 27°C (81°F). The maximum can reach 38°C (101°F), while the minimum can drop as low as 15°C (59°F). This range makes San Bernardino an ideal destination for travelers seeking warm weather with the option for cooler evenings.
In San Bernardino in December, the precipitation amount is 108 mm (4.2 in) spread over 9 days.
In San Bernardino in December humidity is 84%. With an average temperature of 27°C (81°F), this humidity feels like walking through a warm, moist blanket, making travel uncomfortable and sticky, as every step seems to weigh you down with the heavy air.
In San Bernardino in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Bernardino, you can check here.
UV Risk Categories
Weather in San Bernardino varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Bernardino, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 28°C (83°F) | 129 mm (5.1 inches) | 80% | extreme |
| February Weather | 27°C (81°F) | 89 mm (3.5 inches) | 75% | extreme |
| March Weather | 26°C (79°F) | 101 mm (4.0 inches) | 76% | extreme |
| April Weather | 23°C (74°F) | 116 mm (4.6 inches) | 76% | very high |
| May Weather | 20°C (68°F) | 127 mm (5.0 inches) | 75% | high |
| June Weather | 18°C (65°F) | 79 mm (3.1 inches) | 65% | moderate |
| July Weather | 17°C (64°F) | 44 mm (1.7 inches) | 60% | high |
| August Weather | 20°C (67°F) | 49 mm (1.9 inches) | 43% | very high |
| September Weather | 23°C (73°F) | 77 mm (3.0 inches) | 47% | very high |
| October Weather | 24°C (76°F) | 208 mm (8.2 inches) | 52% | extreme |
| November Weather | 26°C (79°F) | 163 mm (6.4 inches) | 71% | extreme |
| December Weather | 27°C (81°F) | 108 mm (4.2 inches) | 84% | extreme |