Last updated: August 23, 2025
In May, the average temperature in San Luis, Guatemala hovers around 28°C (82°F), providing a warm escape for visitors. However, it's good to note that temperatures can dip as low as 20°C (68°F) at night and reach highs of 39°C (102°F) during the day. Expect 131 mm (5.2 in) of precipitation spread over approximately 19 days, contributing to an average humidity level of 62%. Be prepared for a mix of sunny and rainy days in this vibrant locale!
In May in San Luis, the average temperature is 28°C (82°F). Maximums can reach 39°C (102°F) and minimums can be as low as 20°C (68°F). This warm climate makes San Luis an ideal destination for sun-seekers and outdoor enthusiasts.
In San Luis in May, the total precipitation amount reached 131 mm (5.2 in) over the course of 19 days.
In San Luis in May, humidity is 62%. With an average temperature of 28°C (82°F), this humidity feels like walking through a warm, dense fog, making outdoor activities a bit more challenging but still enjoyable for those who appreciate the tropical atmosphere.
In San Luis in May, 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 Luis, you can check here.
UV Risk Categories
Weather in San Luis varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Luis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 22°C (72°F) | 70 mm (2.8 inches) | 85% | very high |
| February Weather | 23°C (74°F) | 45 mm (1.8 inches) | 78% | extreme |
| March Weather | 24°C (76°F) | 55 mm (2.2 inches) | 67% | extreme |
| April Weather | 27°C (81°F) | 54 mm (2.1 inches) | 62% | extreme |
| May Weather | 28°C (82°F) | 131 mm (5.2 inches) | 62% | extreme |
| June Weather | 27°C (81°F) | 204 mm (8.0 inches) | 63% | extreme |
| July Weather | 27°C (80°F) | 115 mm (4.5 inches) | 66% | extreme |
| August Weather | 27°C (80°F) | 138 mm (5.4 inches) | 73% | extreme |
| September Weather | 26°C (80°F) | 199 mm (7.8 inches) | 82% | extreme |
| October Weather | 25°C (78°F) | 267 mm (10.5 inches) | 86% | extreme |
| November Weather | 23°C (74°F) | 179 mm (7.1 inches) | 87% | very high |
| December Weather | 22°C (72°F) | 82 mm (3.2 inches) | 87% | very high |