Last updated: March 2, 2024
The weather in Joint Base Lewis McChord, United States, during September is characterized by an average temperature of 16°C (60°F). Highs can soar to 27°C (82°F), while lows may dip to 7°C (45°F). Typically, the humidity level in Joint Base Lewis McChord throughout September hovers around 74%.
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In September, Joint Base Lewis McChord averages 90 mm (3.5 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 29 minutes of daylight, with the sun shining for approximately 8 hours 37 minutes each day. Additionally, there is a 39% probability of sunny days during this period.
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In September, the UV Index in Joint Base Lewis McChord 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 | 3 | 5 | 6 | 7 | 6 | 5 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||