Last updated: March 2, 2024
The weather in Green Bay, United States, during September is characterized by an average temperature of 17°C (63°F). Highs can soar to 30°C (86°F), while lows may dip to 4°C (40°F). Typically, the humidity level in Green Bay throughout September hovers around 78%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Green Bay averages 65 mm (2.5 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 27 minutes of daylight, with the sun shining for approximately 9 hours 7 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 Green Bay reaches a maximum of 7, indicating a level of High exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 3 | 4 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | Moderate | Low | ||||||||
| Time to burn | 45 min | 30 min | 25 min | 30 min | 45 min | ||||||||