Last updated: March 2, 2024
The weather in Old Tappan, United States, during September is characterized by an average temperature of 20°C (69°F). Highs can soar to 31°C (88°F), while lows may dip to 10°C (50°F). Typically, the humidity level in Old Tappan throughout September hovers around 68%.
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Average temperature
Maximum temperature
Humidity
In September, Old Tappan averages 106 mm (4.2 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 24 minutes of daylight, with the sun shining for approximately 9 hours 10 minutes each day. Additionally, there is a 43% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Old Tappan reaches a maximum of 8, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, 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 | 7 | 8 | 7 | 5 | 3 | 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 | ||||||