Last updated: March 2, 2024
The weather in Keflavik, Iceland, during September is characterized by an average temperature of 9°C (48°F). Highs can soar to 13°C (55°F), while lows may dip to 4°C (39°F). Typically, the humidity level in Keflavik throughout September hovers around 85%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Keflavik averages 171 mm (6.7 inches) of rainfall, typically over the course of 21 rainy days. The month enjoys an average of 12 hours 55 minutes of daylight, with the sun shining for approximately 6 hours 53 minutes each day. Additionally, there is a 15% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Keflavik 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 | ||||||||||