Green Bay, WI Weather
Green Bay hourly forecast: next 24 hours
Today's high of 67°F (19°C) is about 6°F (3°C) below the typical September high of 73°F (23°C).
Current conditions in detail
Green Bay weather tomorrow (Friday, September 18)
Tomorrow in Green Bay looks overcast, with a high of 63° and an overnight low of 55°. There is a 89% chance of rain - plan accordingly. Winds top out near 15 mph, and the UV index reaches 1 (low).
Green Bay 14-day forecast
About the weather in Green Bay
Seasons are the whole story in Green Bay. The gap between an average July and an average January is 29°C - warm summers and cold, often snowy winters - which in practice means 82°F (28°C) afternoons at one end of the calendar and 27°F (-3°C) at the other.
Green Bay weather: quick facts
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 27°F (-3°C)
- Decade extremes (2015-2024): 99°F (37°C) high · -24°F (-31°C) low
- Wettest month: July (11 rainy days) · Sunniest: July (12.7 h sun/day)
- Climate type: humid continental
- Annual swing: 29°C between the average warmest and coolest month · day to night: 9°C
- Snow: about 23 days a year
- Months with freezing average lows: 5
- Average humidity: 70%
Temperatures through the year
Overnight lows average at or below freezing for 5 months, November through March. January is the coolest month, with highs of 27°F (-3°C) and lows near 14°F (-10°C). At its warmest, in July, Green Bay runs to 82°F (28°C) in the afternoon and back to 64°F (18°C) by dawn. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is May through June.
Rain, sun and snow
Snow falls on roughly 23 days a year, mostly November through April. The gridded 2015-2024 daily record for this location tops out at 99°F (37°C) and bottoms at -24°F (-31°C) - decade extremes, not all-time station records.
Season by season
Spring (March through May)
Through spring, Green Bay runs cool rather than cold: 54°F (12°C) by day, 36°F (2°C) after dark, and rain falls on around 34 of the 90 days, plus about 6 snowy days.
Summer (June through August)
Summer is pleasantly warm here - highs near 79°F (26°C), nights near 62°F (16°C), and rain falls on around 34 of the 90 days. Daylight is generous - around 12.0 hours of sun a day.
Fall (September through November)
Through fall, Green Bay is crisp but comfortable: 59°F (15°C) by day, 44°F (7°C) after dark, and expect showers on roughly 27 days across the season, plus about 2 snowy days.
Winter (December through February)
Winter in Green Bay brings deep cold, with daytime highs averaging 30°F (-1°C) and nights around 16°F (-9°C); expect showers on roughly 23 days across the season, plus about 14 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in Green Bay by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 27° | 14° | 7 | 1.5 in | 5.2 h/day | 76% |
| February | 30° | 13° | 7 | 1.4 in | 7.2 h/day | 71% |
| March | 42° | 25° | 10 | 2.6 in | 8.1 h/day | 67% |
| April | 53° | 35° | 13 | 3.5 in | 8.9 h/day | 66% |
| May | 67° | 48° | 11 | 3.7 in | 10.6 h/day | 65% |
| June | 77° | 59° | 11 | 3.8 in | 11.9 h/day | 66% |
| July | 82° | 64° | 11 | 3.8 in | 12.7 h/day | 68% |
| August | 79° | 63° | 11 | 3.8 in | 11.3 h/day | 71% |
| September | 73° | 57° | 9 | 2.8 in | 9.7 h/day | 73% |
| October | 59° | 44° | 11 | 3.3 in | 7.1 h/day | 71% |
| November | 45° | 31° | 7 | 2.1 in | 6.1 h/day | 70% |
| December | 33° | 21° | 8 | 2.3 in | 4.6 h/day | 75% |