Last updated: March 2, 2024
The weather in San Marcos, United States, during May is characterized by an average temperature of 25°C (76°F). Highs can soar to 35°C (95°F), while lows may dip to 13°C (55°F). Typically, the humidity level in San Marcos throughout May hovers around 81%.
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Average temperature
Maximum temperature
Humidity
In May, San Marcos averages 149 mm (5.9 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 13 hours 40 minutes of daylight, with the sun shining for approximately 9 hours 5 minutes each day. Additionally, there is a 29% probability of sunny days during this period.
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Rainy days
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Chance of sun
In May, the UV Index in San Marcos reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 3 | 5 | 8 | 10 | 12 | 11 | 10 | 7 | 4 | 2 | 1 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | |||||