Last updated: August 27, 2025
The average temperature in Santiago, Mexico during May is a pleasant 21°C (70°F), providing a comfortable backdrop for your activities. Expect temperatures to range from a chilly 7°C (45°F) to a sizzling 34°C (93°F). With an average precipitation amount of 41 mm (1.6 in) spread over 6 days, don’t forget to pack an umbrella! Also, the average humidity reaches around 75%, adding a touch of warmth and making for a uniquely vibrant atmosphere.
In May in Santiago, the average temperature is 21°C (70°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 7°C (45°F). This makes for a diverse climate, so travelers should come prepared for both warm days and cooler nights.
In Santiago in May, the precipitation amount is 41 mm (1.6 in) over the course of 6 days.
In Santiago in May, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.
In Santiago in May, 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 Santiago.
UV Risk Categories
Weather in Santiago varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Santiago, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (54°F) | 12 mm (0.5 inches) | 75% | very high |
| February Weather | 15°C (59°F) | 10 mm (0.4 inches) | 69% | extreme |
| March Weather | 17°C (63°F) | 13 mm (0.5 inches) | 65% | extreme |
| April Weather | 19°C (67°F) | 10 mm (0.4 inches) | 64% | extreme |
| May Weather | 21°C (70°F) | 41 mm (1.6 inches) | 75% | extreme |
| June Weather | 20°C (68°F) | 99 mm (3.9 inches) | 78% | extreme |
| July Weather | 19°C (67°F) | 89 mm (3.5 inches) | 67% | extreme |
| August Weather | 19°C (67°F) | 56 mm (2.2 inches) | 64% | extreme |
| September Weather | 18°C (65°F) | 100 mm (3.9 inches) | 81% | extreme |
| October Weather | 17°C (62°F) | 50 mm (2.0 inches) | 85% | extreme |
| November Weather | 14°C (58°F) | 14 mm (0.6 inches) | 87% | very high |
| December Weather | 12°C (55°F) | 10 mm (0.4 inches) | 87% | very high |