Last updated: March 2, 2024
The weather in Dun Laoghaire, Ireland, during September is characterized by an average temperature of 13°C (56°F). Highs can soar to 21°C (69°F), while lows may dip to 6°C (42°F). Typically, the humidity level in Dun Laoghaire throughout September hovers around 86%.
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Average temperature
Maximum temperature
Humidity
In September, Dun Laoghaire averages 73 mm (2.9 inches) of rainfall, typically over the course of 14 rainy days. The month enjoys an average of 12 hours 37 minutes of daylight, with the sun shining for approximately 9 hours 47 minutes each day. Additionally, there is a 20% probability of sunny days during this period.
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In September, the UV Index in Dun Laoghaire reaches a maximum of 5, 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.
| 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 | 2 | 4 | 5 | 5 | 5 | 4 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||