Last updated: March 2, 2024
The weather in Grundarfjoerdur, Iceland, during September is characterized by an average temperature of 8°C (48°F). Highs can soar to 12°C (54°F), while lows may dip to 4°C (39°F). Typically, the humidity level in Grundarfjoerdur throughout September hovers around 89%.
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Average temperature
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Humidity
In September, Grundarfjoerdur averages 159 mm (6.3 inches) of rainfall, typically over the course of 18 rainy days. The month enjoys an average of 12 hours 57 minutes of daylight, with the sun shining for approximately 5 hours 57 minutes each day. Additionally, there is a 14% probability of sunny days during this period.
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In September, the UV Index in Grundarfjoerdur reaches a maximum of 3, 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 | 1 | 2 | 2 | 3 | 3 | 3 | 3 | 2 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||