Last updated: March 2, 2024
The weather in Greenwich, United States, during September is characterized by an average temperature of 20°C (67°F). Highs can soar to 31°C (89°F), while lows may dip to 7°C (45°F). Typically, the humidity level in Greenwich throughout September hovers around 78%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Greenwich averages 79 mm (3.1 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 34 minutes each day. Additionally, there is a 55% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Greenwich 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 | 3 | 5 | 7 | 8 | 8 | 6 | 5 | 3 | 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 | ||||||