NWS, the American and the European model agree on a high near 69° in Green Bay today. Tomorrow: cloudy, around 64°, with a 27% chance of rain, and the models disagree, so treat it as uncertain.
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Green Bay weather in numbers
measured normals and 10 years of recorded weather
Green Bay swings 67°F across the year, from 80°F highs in July to 13°F lows in January, and June is usually the wettest month in a year that brings about 31 in of precipitation. Over 10 years of recorded weather it averages 80 days a year at 77°F or above, 21 of them at 86°F or above, 140 frost nights, and rain on 117 days.
Warmest month
July
80°F average high
Coldest month
January
13°F average low
Wettest month
June
31 in a year
Comfortable
3 months
May, August and September
Residents
105,000
share this forecast
Most accurate here
European
92/100 CheckWeather Score
Warm days
80 days
a year at 77°F or above
Frost nights
140 nights
a year below 32°F
Rain days
117 days
a year with 0.04 in or more
Day counts are from the ERA5 reanalysis for Green Bay’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
NWS, American, European side by side around Green Bay and nearby towns.Live rain radar →
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Green Bay hourly forecast: next 14 hours
consensus of the three models
Rain in the next 24 hours, model by model
each model's own hourly precipitation, side by side
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Green Bay 10-day forecast, out to 14 days
where the models agree, and where they split
Today
Cloudy
69°52°
models agree
Tomorrow
Cloudy
64°54°
±10°
Mon
Light drizzle
54°47°
±6°
Tue
Light drizzle
55°45°
±5°
Wed
Cloudy
67°52°
±5°
Thu
Partly cloudy
65°49°
±6°
Fri
Partly cloudy
62°47°
±11°
Sat
Light drizzle
65°53°
±12°
Sun
Light drizzle
62°50°
±11°
Mon
Light drizzle
57°40°
±11°
Tue
Cloudy
47°36°
models agree
Wed
Cloudy
50°37°
models agree
Thu
Cloudy
54°38°
±13°
Green Bay, Wisconsin (WI) is at its warmest in Jul (average highs near 80°F) and coldest in Jan (lows around 13°F), with roughly 31 in of precipitation across the year. Below, compare what NWS, American, European forecast for Green Bay right now, and see exactly where they disagree.
average daytime high and overnight low across a typical year (1991-2020)
Jan
24°
13°
Feb
31°
13°
Mar
40°
23°
Apr
53°
34°
May
66°
45°
Jun
76°
57°
Jul
80°
61°
Aug
78°
61°
Sep
71°
52°
Oct
58°
42°
Nov
43°
30°
Dec
30°
19°
Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How Green Bay's weather has changed since 1995
30 years of daily data, 1995-2024, shown as change
+1.1°F
Around Green Bay, the difference between 1995-2004 and 2015-2024 is +1.1°F, within the normal swing from year to year.
1995each stripe is one year2024
cooler than averagearound averagewarmer than average
Days above 86°F
3 more days a year
2015-2024 against 1995-2004. Within the normal year-to-year swing
Frost nights
2 fewer nights a year
2015-2024 against 1995-2004, below 32°F. Within the normal year-to-year swing
Average wind
−2%
2015-2024 against 1995-2004. Within the normal year-to-year swing
Bars: each year against the area's 30-year average. Dashed lines: the average of the first and the last ten years.
See the numbers year by year
Year
Temp vs average
Days >86°F vs avg
Frost nights vs avg
Wind vs avg
1995
−1.5°F
+4
+13
+1%
1996
−4.2°F
−8
+26
+1%
1997
−1.9°F
−7
+16
−1%
1998
+3.1°F
+0
−19
−1%
1999
+0.8°F
−4
−9
+3%
2000
−0.1°F
−7
−10
+1%
2001
+0.8°F
+5
−14
−1%
2002
+0.3°F
+2
+21
+5%
2003
−1.7°F
−3
+4
+1%
2004
−0.6°F
−8
−0
+3%
2005
+1.5°F
+23
−1
−1%
2006
+1.9°F
+6
−9
−1%
2007
+1.2°F
+12
−11
+5%
2008
−2.1°F
−5
+7
+1%
2009
−1.5°F
−7
−3
−1%
2010
+1.5°F
−6
−13
−1%
2011
−0.3°F
−6
+1
−1%
2012
+3.5°F
+21
−14
−1%
2013
−1.9°F
−2
+11
+3%
2014
−4.6°F
−8
+10
+1%
2015
+0.1°F
+1
−10
+3%
2016
+1.5°F
+4
−17
−1%
2017
+0.1°F
−5
−2
+3%
2018
−0.6°F
+10
+26
−3%
2019
−2.4°F
−7
+11
−1%
2020
+0.3°F
−4
+21
−1%
2021
+2.1°F
−1
−8
−5%
2022
−0.6°F
−5
+6
+5%
2023
+2.2°F
+6
−2
−5%
2024
+3.7°F
−4
−20
−1%
Source: NASA POWER daily data from the MERRA-2 reanalysis, 1995-2024. Each value describes a grid square of about 50 km around Green Bay, not a weather station, and a square that takes in sea or a large lake runs milder than the city itself. That is why this section shows change against the square's own 30-year average rather than counts you could compare with a local station. Rain and snow are left out because their long-term record in this dataset is not consistent over time. "Within the normal year-to-year swing" means the change is smaller than the usual differences between single years.
Which forecast is most accurate in Green Bay?
CheckWeather Score, graded against the weather that actually happened
Provider
CheckWeather-score
Temp
Wind
Rain
Run by
European ★ Best
92
/100rank #1
96±0.4°F
98±0.6 mph
8290% hit
ECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American
84
/100rank #2
85±1.5°F
95±1.5 mph
7687% hit
NOAA / NCEP (United States)College Park, Maryland, USA
The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.
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Where the models disagree
temperature and rain, judged separately
Day
Temperature
Rain
Today
±3°68° to 71°
±5%5% to 10% chance
Tomorrow
±10°59° to 69°
±15%12% to 27% chance
Mon
±6°52° to 58°
±14%7% to 21% chance
Tue
±5°53° to 58°
±23%13% to 36% chance
Wed
±5°65° to 70°
±26%21% to 47% chance
The models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.
Sunrise and sunset in Green Bay
today, local time
Sunrise
07:19
Sunset
17:52
Daylight
10h 33m
Common questions
What's the weather in Green Bay today?
Saturday, October 24: NWS, the American and the European model agree on a high near 69° in Green Bay today. Tomorrow: cloudy, around 64°, with a 27% chance of rain, and the models disagree, so treat it as uncertain. The forecast on this page refreshes live.
Will it rain in Green Bay today or tomorrow?
The models split on rain in Green Bay on Sunday, October 25: NWS 12%, American 12%, European 27%. When they disagree like this, treat any single app's answer with caution. On Saturday, October 24 the highest chance of rain from any model is 10%. The hourly strip and the model-by-model rain panel above update live.
Which forecast is most accurate for Green Bay?
Over the last 30 days, the European model has been the most accurate for Green Bay (CheckWeather Score 92/100), ahead of the American at 84. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in Green Bay?
July is typically the warmest month in Green Bay, with average highs around 80°F.
How cold does Green Bay get?
The coldest month in Green Bay is January, when overnight lows average about 13°F.
How much rain does Green Bay get?
Green Bay sees roughly 31 in of precipitation a year, with June usually the wettest month.
Is Green Bay getting warmer?
Not clearly. In NASA's reanalysis for the area around Green Bay, the difference between 1995-2004 and 2015-2024 is 1.1°F, within the normal swing from year to year.
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