Last updated: March 2, 2024
The weather in Grand Marais, United States, during September is characterized by an average temperature of 13°C (56°F). Highs can soar to 21°C (70°F), while lows may dip to 6°C (43°F). Typically, the humidity level in Grand Marais throughout September hovers around 73%.
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Average temperature
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Humidity
In September, Grand Marais averages 103 mm (4.1 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 30 minutes of daylight, with the sun shining for approximately 8 hours 26 minutes each day. Additionally, there is a 49% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Grand Marais reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 25 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 | 4 | 5 | 6 | 7 | 6 | 5 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||