September Weather in Portstewart

Last updated: March 2, 2024

The weather in Portstewart, United Kingdom, during September is characterized by an average temperature of 14°C (57°F). Highs can soar to 17°C (63°F), while lows may dip to 10°C (51°F). Typically, the humidity level in Portstewart throughout September hovers around 88%.

10°C (51°F)

Minimum temperature

14°C (57°F)

Average temperature

17°C (63°F)

Maximum temperature

88%

Humidity

Precipitation and Sunshine hours

In September, Portstewart averages 117 mm (4.6 inches) of rainfall, typically over the course of 20 rainy days. The month enjoys an average of 12 hours 39 minutes of daylight, with the sun shining for approximately 9 hours 26 minutes each day. Additionally, there is a 23% probability of sunny days during this period.

117 mm (4.6 inches)

Precipitation

20 rainy days

Rainy days

9 hours 26 minutes

Sunshine hours

23%

Chance of sun

UV Index

In September, the UV Index in Portstewart reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, 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 1 2 3 4 5 5 4 3 2 1 1
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

Compare Portstewart's Climate with Cities Worldwide