Last updated: August 22, 2025
In San Luis, Argentina, the average temperature in December is a pleasant 23°C (74°F). However, temperatures can vary significantly, with a minimum of 10°C (50°F) and soaring up to a maximum of 39°C (103°F). Expect around 63 mm (2.5 in) of precipitation spread over 9 days, all while enjoying an average humidity of 40%.
In December in San Luis, the average temperature is 23°C (74°F). Maximum temperatures can reach 39°C (103°F), while the minimums can drop to as low as 10°C (50°F). This range makes San Luis an ideal destination for travelers seeking both warm and cooler experiences.
In San Luis in December, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.
In San Luis in December humidity is 40%. With average temperature 23°C (74°F), this humidity feels like a pleasant embrace, making it comfortable for traveling as you enjoy the sights without feeling overly sticky or uncomfortable.
In San Luis in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Luis.
UV Risk Categories
Weather in San Luis varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Luis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 24°C (75°F) | 92 mm (3.6 inches) | 40% | extreme |
| February Weather | 22°C (72°F) | 79 mm (3.1 inches) | 48% | extreme |
| March Weather | 20°C (69°F) | 60 mm (2.4 inches) | 53% | extreme |
| April Weather | 17°C (63°F) | 72 mm (2.8 inches) | 63% | very high |
| May Weather | 13°C (55°F) | 32 mm (1.2 inches) | 67% | moderate |
| June Weather | 9°C (49°F) | 13 mm (0.5 inches) | 61% | moderate |
| July Weather | 9°C (48°F) | 9 mm (0.4 inches) | 55% | moderate |
| August Weather | 12°C (54°F) | 4 mm (0.2 inches) | 48% | high |
| September Weather | 15°C (59°F) | 21 mm (0.8 inches) | 45% | very high |
| October Weather | 18°C (64°F) | 32 mm (1.2 inches) | 43% | extreme |
| November Weather | 21°C (70°F) | 71 mm (2.8 inches) | 45% | extreme |
| December Weather | 23°C (74°F) | 63 mm (2.5 inches) | 40% | extreme |