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%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
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.
Precipitation
Rainy days
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Chance of sun
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.
| 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 | ||||||||||