Last updated: March 2, 2024
The weather in Southold, United States, during September is characterized by an average temperature of 20°C (69°F). Highs can soar to 25°C (77°F), while lows may dip to 14°C (58°F). Typically, the humidity level in Southold throughout September hovers around 68%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Southold averages 97 mm (3.8 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 21 minutes each day. Additionally, there is a 49% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Southold 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 | 3 | 4 | 6 | 8 | 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 | ||||||