September Weather in St Martin

Last updated: March 2, 2024

The weather in St Martin, Guernsey, during September is characterized by an average temperature of 17°C (62°F). Highs can soar to 20°C (69°F), while lows may dip to 13°C (56°F). Typically, the humidity level in St Martin throughout September hovers around 76%.

13°C (56°F)

Minimum temperature

17°C (62°F)

Average temperature

20°C (69°F)

Maximum temperature

76%

Humidity

Precipitation and Sunshine hours

In September, St Martin averages 63 mm (2.5 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 32 minutes of daylight, with the sun shining for approximately 11 hours 16 minutes each day. Additionally, there is a 43% probability of sunny days during this period.

63 mm (2.5 inches)

Precipitation

9 rainy days

Rainy days

11 hours 16 minutes

Sunshine hours

43%

Chance of sun

UV Index

In September, the UV Index in St Martin reaches a maximum of 6, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 30 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 1 1 2 3 4 5 5 5 4 3 2 1 1
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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