Weather StoryAlmanac, microseasons, and the day's weather story.

Green Bay, Wisconsin Weather

Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →

Green Bay weather forecast — hour by hour, 7-day outlook, NOAA radar

Green Bay, WI
Sunday, August 2 at 9:59 AM
68
°
Clear
Feels like
67°
Humidity
80%
Wind
14 mph
Sunrise
12:40 AM
Sunset
3:16 PM
Green Bay, WI
Hour by hour · 24h
24-Hour ForecastGreen Bay, WI: 24-hour forecast. Temperatures range from 60 to 78 degrees Fahrenheit.
L 60°H 78°
Green Bay, WI
7-day forecast
  1. Today
    Aug 2
    Overcast
    —
    —
    78°65°—
  2. Monday
    Aug 3
    Overcast
    —
    —
    84°60°+6°
  3. Tuesday
    Aug 4
    Light Drizzle
    14%
    —
    86°61°+2°
  4. Wednesday
    Aug 5
    Heavy Showers
    47%
    0.75″
    75°64°-11°
  5. Thursday
    Aug 6
    Showers
    18%
    0.45″
    82°63°+7°
  6. Friday
    Aug 7
    Clear
    —
    —
    84°64°+2°
  7. Saturday
    Aug 8
    Light Showers
    26%
    0.01″
    85°66°+1°
Green Bay, WI
Next 24 hours · Mild now
56°69°82°12p6p12a6anow 67°high 78°low 60°
Green Bay, WI
Anemometer · 24h winds · from true
NESW
From · True
NNE
016° · backing 50°
Direction
NNE
016°
Sustained
14
mph
Gust
23
mph
Peak 24h
23
avg 9 mph
Beaufort · 4 · MOD BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 9 mph · pk 23 mph
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 221SUSTGUST
−24h−18h−12h−6hnow
Sustained 14 mph with gusts pulsing to 23 — flags snap, branches bend.
Green Bay, WI
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
992.2
+0.2 mb in 3h · steady · 29.30 inHg
Now
992.2
mb
3h
+0.2
mb
12h
+0.8
mb
24h
+0.2
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 990–992
9859909951000STORM|RAIN-21h-18h-15h-12h-9h-6h-3h-24hNOW991.8990.3991.7
Deep low — expect rough seas, strong wind, and persistent rain.
Green Bay, WI
Air quality
54
AQI
Moderate
→0 in 6h

AQI 54 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.8 µg/m³, PM10 at 11.0 µg/m³ — typical background levels with no transport signature.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
10.8μg/m³
PM 10Good
11μg/m³
NO₂Good
1μg/m³
OzoneGood
54μg/m³
UV IndexLow
2.0

What's driving it

PM × Wind × Precip

PM2.5 at 10.8 µg/m³, PM10 at 11.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.98
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³520
Green Bay, WI
Sky cover · visibility · 24h
Cloud cover
7%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
38.7mi
UNLIMITED
42 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:59 UTC · Green Bay, WI · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:59 UTC · Green Bay, WI · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Green Bay, WI
Satellite · infrared · animated
Green Bay, WI
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Green Bay, WI
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:07 AM
Sunrise
12:40 AM
Daylight
14h 36m
Sunset
3:16 PM
Civil dusk
8:51 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Green Bay, WI
The moon
Waning Gibbous
84% illuminated
Moonrise
9:37 PM
Moonset
9:58 AM
In sign
♓︎ Pisces
Green Bay, WI
Microseason
Aug 1–5

Night falls a minute earlier

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Green Bay at a glance

  • Today vs. normal: 10°F above the seasonal normal for this latitude
  • Last frost: May 13 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 54301, 54302, 54303, 54304, 54307, 54311, 54313

16-Day Forecast — Green Bay

  1. Sun78°65°3%
  2. Mon84°60°1%
  3. Tue86°61°14%
  4. Wed75°64°47%
  5. Thu82°63°18%
  6. Fri84°64°6%
  7. Sat85°66°26%
  8. Sun87°69°28%
  9. Mon78°61°23%
  10. Tue76°60°23%
  11. Wed80°64°20%
  12. Thu82°68°35%
  13. Fri89°69°23%
  14. Sat82°63°15%
  15. Sun80°60°19%
  16. Mon82°64°19%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Green Bay

Right now in the garden

Peak growing season

As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Green Bay

SPC includes Green Bay in the general thunderstorm area day after tomorrow — no severe risk, but storms are possible.

  • TODAYNONENo severe risk
  • TOMORROWNONENo severe risk
  • DAY 3TSTMGeneral Thunderstorms

Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

Sun & seasons in Green Bay

Green Bay sits in Brown County, where the year’s longest day runs 15h 33m of daylight and its shortest just 8h 49m — a swing of +6h 44m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Milwaukee, the state’s largest city, lies about 100 miles to the S. The nearest town Green Bay tracks is Appleton, roughly 26 miles to the SW.

Air quality in Green Bay’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 37). See the full air-quality history for Green Bay.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

Night falls a minute earlier

Sunset retreats perceptibly — daylight shortening speeds up.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

Green Bay's warmest month is July (~73°F mean) and its coldest is January (~18°F). Rainfall peaks in June (3.9 inches) and bottoms out in February (1.5 inches).

MonthMean tempPrecipRainy days
January18°1.5″16
February20°1.5″13
March30°2.2″15
April45°2.9″17
May55°3.4″18
June67°3.9″17
July73°3.0″14
August72°3.0″15
September64°3.6″15
October52°2.5″13
November35°2.7″14
December22°1.7″15

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Green Bay's January averages 18°F and July 73°F — 56°F apart — while precipitation totals roughly 31.9 inches over some 183 days.

Summer convection drives Green Bay's precipitation: June logs 3.9 inches on 16.5 rainy days, against February's 1.5 inches on 13.3 — warm-season storms carry Green Bay's moisture. It is a warm-season-wet pattern Green Bay shares with places like Allouez, WI, Bellevue, WI and Ashwaubenon, WI.

Green Bay's growing window opens around late-May, once Green Bay's overnight lows stop freezing — sow kale, peas, spinach, and parsnips. In Green Bay, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Green Bay's frost date. Around early-October, freezing nights resume in Green Bay and tender crops must come in. In Green Bay, low spots run 4-7°F colder than nearby slopes, nudging Green Bay's frost dates a week.

Similar climates: Allouez, WI, Bellevue, WI, Ashwaubenon, WI, Howard, WI, De Pere, WI.

Naturalist notes

American robins return to Green Bay lawns in late March, their red breasts signaling winter's retreat across Wisconsin.

Sugar maples begin leafing out in early May, their tender green unfurling as soil temperatures climb past the 45°F threshold.

Frequently asked

When does it freeze in Green Bay?
In Green Bay, expect the last spring frost near mid-May; Green Bay's first autumn frost comes around mid-October.
What is the rainy season in Green Bay?
Green Bay sees its heaviest rain in June (around 3.9 inches), part of roughly 32 inches a year.
What is the warmest month in Green Bay?
Green Bay peaks in July, when the mean runs near 73°F.
What is the coldest month in Green Bay?
January is Green Bay's coldest month, averaging about 18°F.
When can I start a vegetable garden in Green Bay?
Around mid-May, start frost-hardy crops in Green Bay; tomatoes and basil belong a fortnight later.
How many rainy days does Green Bay get?
Green Bay records around 183 days of measurable precipitation annually.
What hardiness zone is Green Bay?
Since January in Green Bay averages 18°F, Green Bay's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Green Bay?
Green Bay's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Green Bay?
See this week's day-by-day rain chances for Green Bay in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Green Bay?
Current conditions for Green Bay and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Green Bay forecast updated?
The Green Bay forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Green Bay?
Today's sunrise and sunset times for Green Bay are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Green Bay?
The next few days in Green Bay's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer humid continental zone, Green Bay, Wisconsin swings from 18°F in the heart of winter to 73°F at midsummer — a 55°F arc.

In a typical year Green Bay records about 32 inches of precipitation on around 183 days.

Green Bay's 55°F range, set by its 44.5°N position, drives frost timing and what thrives in Green Bay.

All cities in Wisconsin →

Milwaukee, WI weather →

ZIP codes in Green Bay

  • 54304
  • 54303
  • 54302
  • 54301
  • 54311
  • 54305
  • 54306
  • 54308

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.