Last updated: March 2, 2024
The weather in San Marcos, El Salvador, during September is characterized by an average temperature of 26°C (79°F). Highs can soar to 33°C (92°F), while lows may dip to 21°C (70°F). Typically, the humidity level in San Marcos throughout September hovers around 77%.
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Average temperature
Maximum temperature
Humidity
In September, San Marcos averages 301 mm (11.9 inches) of rainfall, typically over the course of 29 rainy days. The month enjoys an average of 12 hours 10 minutes of daylight, with the sun shining for approximately 9 hours 57 minutes each day. Additionally, there is a 23% probability of sunny days during this period.
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Rainy days
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Chance of sun
In September, the UV Index in San Marcos reaches a maximum of 13, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 3 | 7 | 10 | 12 | 13 | 12 | 9 | 5 | 2 | 1 | 0 | 0 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 30 min | 45 min | |||||