Last updated: March 2, 2024
The weather in San Sebastian, Mexico, during September is characterized by an average temperature of 18°C (65°F). Highs can soar to 27°C (81°F), while lows may dip to 10°C (50°F). Typically, the humidity level in San Sebastian throughout September hovers around 82%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, San Sebastian averages 123 mm (4.8 inches) of rainfall, typically over the course of 20 rainy days. The month enjoys an average of 12 hours 13 minutes of daylight, with the sun shining for approximately 8 hours 47 minutes each day. Additionally, there is a 17% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in San Sebastian reaches a maximum of 14, 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 | 0 | 1 | 2 | 5 | 8 | 12 | 14 | 14 | 12 | 8 | 5 | 2 | 1 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 30 min | 45 min | ||||||