September Weather in Green Bay

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%.

4°C (40°F)

Minimum temperature

17°C (63°F)

Average temperature

30°C (86°F)

Maximum temperature

78%

Humidity

Precipitation and Sunshine hours

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.

65 mm (2.5 inches)

Precipitation

10 rainy days

Rainy days

9 hours 7 minutes

Sunshine hours

55%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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