Last updated: March 2, 2024
The weather in San Sebastian, Spain, during September is characterized by an average temperature of 18°C (65°F). Highs can soar to 28°C (82°F), while lows may dip to 10°C (51°F). Typically, the humidity level in San Sebastian throughout September hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, San Sebastian averages 97 mm (3.8 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 27 minutes of daylight, with the sun shining for approximately 11 hours 10 minutes each day. Additionally, there is a 28% 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 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 25 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 | 1 | 2 | 4 | 5 | 7 | 7 | 7 | 5 | 4 | 2 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||