Green Bay Weather: September
 |
Average Day Temperature: | 73.9°F |
|
Average Night Temperature: | 57.3°F |
|
Sea Water Temperature: | 70.6°F |
|
Number of Sunny Days: | 13 days |
| Sunshine Hours: | 11.8 - 13.2 hours | |
|
Number of Rainy Days: | 1 day |
| Precipitation Totals: | 0.7 in | |
| detailed information | ||
forecast
| Green Bay |
Temperature
| Green Bay |
Air Temperature in September, °F
The highest day temperature in September 2025 was 88°F. The lowest night temperature was 41°F. The average values for day and night temperatures during September were 74.4°F и 56.0°F respectivly.
Green Bay Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Green Bay was 69.0°F. The maximum and minimum values were 63.2°F and 73.4°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Green Bay is 0.7 in.
The average wind speed in September is 8.9 mph. It makes September one of the most windless months of the year for Green Bay.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Green Bay in September is 7.8 hours.
Green Bay on the Weather Map
| Boston |  |
+62 |
| Chicago |  |
+66 |
| Hawaii |  |
+80 |
| Las Vegas | |
+80 |
| Los Angeles | |
+72 |
| Maui |  |
+66 |
| Miami |  |
+88 |
| Myrtle Beach | |
+78 |
| New York | |
+66 |
| Panama City Beach | |
+90 |
| San Diego | |
+70 |
| San Francisco | |
+60 |
| Santa Monica | |
+72 |
| Sarasota | |
+86 |
| Washington |  |
+66 |
| 0900 |  |
68°F | NE 17 mph |
| 1200 | |
76°F | E 19 mph |
| 1500 | |
74°F | E 16 mph |
| 1800 | |
68°F | E 11 mph |
| 2100 | |
64°F | E 7 mph |
| 0000 | |
62°F | SW 11 mph |
| 0300 | |
60°F | SW 8 mph |
| 0600 |  |
58°F | SW 8 mph |