Last updated: August 23, 2025
In May, the average temperature in San Mateo, Guatemala hovers around 18°C (65°F), with a comfortable minimum of 13°C (55°F) and a pleasant maximum of 26°C (79°F). Be prepared for generous precipitation, totaling 644 mm (25.4 in) over the 31 days, and enjoy the relatively high humidity levels averaging at 65%.
In May in San Mateo, the average temperature is 18°C (65°F). The maximum can reach 26°C (79°F), while the minimum can drop to as low as 13°C (55°F). This pleasant climate makes San Mateo an ideal destination for travelers seeking comfortable weather and outdoor activities.
In San Mateo in May, the total precipitation amount is 644 mm (25.4 in) accumulated over 31 days.
In San Mateo in May, humidity is 65%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace that clings to your skin, making you feel slightly sticky as you explore. It's comfortable enough for sightseeing, but breathable enough to enjoy a leisurely stroll, though you might find yourself seeking shade during the warmest parts of the day.
In San Mateo 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 Mateo, you can check here.
UV Risk Categories
Weather in San Mateo varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Mateo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 17°C (63°F) | 32 mm (1.2 inches) | 76% | extreme |
| February Weather | 17°C (63°F) | 59 mm (2.3 inches) | 68% | extreme |
| March Weather | 18°C (64°F) | 110 mm (4.3 inches) | 59% | extreme |
| April Weather | 18°C (65°F) | 246 mm (9.7 inches) | 57% | extreme |
| May Weather | 18°C (65°F) | 644 mm (25.4 inches) | 65% | extreme |
| June Weather | 18°C (65°F) | 477 mm (18.8 inches) | 66% | extreme |
| July Weather | 19°C (66°F) | 258 mm (10.2 inches) | 75% | extreme |
| August Weather | 18°C (65°F) | 414 mm (16.3 inches) | 82% | extreme |
| September Weather | 18°C (65°F) | 457 mm (18.0 inches) | 82% | extreme |
| October Weather | 18°C (65°F) | 373 mm (14.7 inches) | 83% | extreme |
| November Weather | 18°C (64°F) | 122 mm (4.8 inches) | 80% | extreme |
| December Weather | 17°C (63°F) | 48 mm (1.9 inches) | 76% | very high |