Last updated: March 2, 2024
The weather in Falls Church, United States, during September is characterized by an average temperature of 22°C (72°F). Highs can soar to 33°C (92°F), while lows may dip to 10°C (50°F). Typically, the humidity level in Falls Church throughout September hovers around 75%.
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Average temperature
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Humidity
In September, Falls Church averages 102 mm (4.0 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 23 minutes of daylight, with the sun shining for approximately 9 hours 14 minutes each day. Additionally, there is a 54% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Falls Church reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 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 | 6 | 8 | 8 | 8 | 6 | 4 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||