September Weather in San Sebastian

Last updated: March 2, 2024

The weather in San Sebastian, Mexico, during September is characterized by an average temperature of 20°C (68°F). Highs can soar to 28°C (82°F), while lows may dip to 15°C (59°F). Typically, the humidity level in San Sebastian throughout September hovers around 83%.

15°C (59°F)

Minimum temperature

20°C (68°F)

Average temperature

28°C (82°F)

Maximum temperature

83%

Humidity

Precipitation and Sunshine hours

In September, San Sebastian averages 502 mm (19.8 inches) of rainfall, typically over the course of 29 rainy days. The month enjoys an average of 12 hours 12 minutes of daylight, with the sun shining for approximately 8 hours 25 minutes each day. Additionally, there is a 15% probability of sunny days during this period.

502 mm (19.8 inches)

Precipitation

29 rainy days

Rainy days

8 hours 25 minutes

Sunshine hours

15%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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 4 8 11 14 14 12 9 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

Compare San Sebastian's Climate with Cities Worldwide