Last updated: August 27, 2025
In San Isidro, Mexico, the average temperature in December is a comfortable 25°C (77°F). The weather can vary significantly, with minimum temperatures dropping to 11°C (51°F) and peaking at a scorching 37°C (98°F). Expect some rain, as 31 mm (1.2 in) of precipitation may fall over 5 days throughout the month. With an average humidity of 84%, it’s a good idea to stay hydrated and find some shade during the warmer hours!
In December in San Isidro, the average temperature is 25°C (77°F). Maximum temperatures can reach 37°C (98°F), while minimums can drop as low as 11°C (51°F). Pack accordingly for a range of weather conditions during your travels.
In San Isidro in December, the precipitation amount is 31 mm (1.2 in) spread over 5 days.
In San Isidro in December, humidity is 84%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities challenging and prompting travelers to seek shade and stay hydrated.
In San Isidro in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in San Isidro.
UV Risk Categories
Weather in San Isidro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Isidro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 25°C (76°F) | 22 mm (0.9 inches) | 78% | very high |
| February Weather | 27°C (80°F) | 8 mm (0.3 inches) | 73% | extreme |
| March Weather | 28°C (83°F) | 7 mm (0.3 inches) | 64% | extreme |
| April Weather | 30°C (87°F) | 18 mm (0.7 inches) | 61% | extreme |
| May Weather | 31°C (88°F) | 61 mm (2.4 inches) | 59% | extreme |
| June Weather | 29°C (85°F) | 274 mm (10.8 inches) | 59% | extreme |
| July Weather | 29°C (85°F) | 92 mm (3.6 inches) | 64% | extreme |
| August Weather | 29°C (84°F) | 124 mm (4.9 inches) | 76% | extreme |
| September Weather | 28°C (83°F) | 172 mm (6.8 inches) | 80% | extreme |
| October Weather | 27°C (81°F) | 155 mm (6.1 inches) | 82% | extreme |
| November Weather | 26°C (78°F) | 59 mm (2.3 inches) | 83% | very high |
| December Weather | 25°C (77°F) | 31 mm (1.2 inches) | 84% | very high |