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Green Bay Weather by Month
Average temperatures, rainfall and humidity for Green Bay, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Green Bay month looks like before you travel — then check the live Green Bay forecast for the days ahead.
Warmest month
July
27°C average high
Coolest month
February
-10°C average low
Wettest month
June
83 mm of rain
Driest month
February
7 mm of rain
Average temperature and rainfall in Green Bay by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | -3°C | -10°C | -31°C / 16°C | 12 mm | 77% | 14 km/h |
| February | -1°C | -10°C | -29°C / 20°C | 7 mm | 73% | 15 km/h |
| March | 5°C | -4°C | -27°C / 22°C | 33 mm | 72% | 15 km/h |
| April | 12°C | 2°C | -11°C / 29°C | 63 mm | 69% | 17 km/h |
| May | 20°C | 9°C | -2°C / 33°C | 66 mm | 66% | 14 km/h |
| June | 25°C | 15°C | 3°C / 35°C | 83 mm | 69% | 13 km/h |
| July | 27°C | 17°C | 8°C / 35°C | 52 mm | 72% | 11 km/h |
| August | 26°C | 16°C | 7°C / 33°C | 66 mm | 77% | 10 km/h |
| September | 23°C | 13°C | 2°C / 34°C | 62 mm | 78% | 11 km/h |
| October | 15°C | 6°C | -18°C / 31°C | 67 mm | 75% | 13 km/h |
| November | 8°C | 0°C | -16°C / 24°C | 39 mm | 74% | 14 km/h |
| December | 1°C | -6°C | -24°C / 19°C | 28 mm | 79% | 14 km/h |
Best time to visit Green Bay
The most comfortable time to visit Green Bay is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 579 mm a year.
Travellers who prefer heat should aim for July, when highs average 27°C. June is the month to avoid if rain would spoil your plans — it averages 83 mm, roughly 11× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Green Bay forecast for what is happening now.