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 28°C (83°F). Highs can soar to 38°C (100°F), while lows may dip to 21°C (70°F). Typically, the humidity level in San Sebastian throughout September hovers around 84%.

21°C (70°F)

Minimum temperature

28°C (83°F)

Average temperature

38°C (100°F)

Maximum temperature

84%

Humidity

Precipitation and Sunshine hours

In September, San Sebastian averages 167 mm (6.6 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 12 hours 13 minutes of daylight, with the sun shining for approximately 9 hours 13 minutes each day. Additionally, there is a 23% probability of sunny days during this period.

167 mm (6.6 inches)

Precipitation

19 rainy days

Rainy days

9 hours 13 minutes

Sunshine hours

23%

Chance of sun

UV Index

In September, the UV Index in San Sebastian reaches a maximum of 12, 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 7 10 12 12 10 7 4 2 1
Exposure Low Moderate High VeryHigh Extreme VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 10 min 15 min 25 min 30 min 45 min

Compare San Sebastian's Climate with Cities Worldwide