Last updated: March 2, 2024
The weather in Birch Bay, United States, during September is characterized by an average temperature of 16°C (61°F). Highs can soar to 28°C (83°F), while lows may dip to 8°C (47°F). Typically, the humidity level in Birch Bay throughout September hovers around 76%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Birch Bay averages 149 mm (5.9 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 31 minutes of daylight, with the sun shining for approximately 8 hours 21 minutes each day. Additionally, there is a 33% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Birch Bay reaches a maximum of 6, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 3 | 5 | 6 | 6 | 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 | ||||||||