Green Bay, Wisconsin Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Green Bay weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——82°51°—
- ThursdayJun 4Light Drizzle15%0.02″85°60°+3°
- FridayJun 5Light Drizzle82%—73°66°-12°
- SaturdayJun 6Drizzle58%—84°59°+11°
- SundayJun 7Overcast——74°54°-10°
- MondayJun 8Overcast16%—75°57°+1°
- TuesdayJun 9Drizzle16%0.20″71°63°-4°
Ozone at AQI 53. AQI up 24 in the last 6 hours — air quality is degrading. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 53. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 53
- UV peak
- 0.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 8.3 µg/m³, PM10 at 8.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.97
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:37 AM
- Moonset
- 1:38 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Green Bay at a glance
- Today vs. normal: 70°F — typical for the season
- Last frost: May 13 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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 has placed Green Bay in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Green Bay's warmest temperatures (~69°F mean) while January delivers the coldest (~17°F). June sees peak rainfall (4.2 inches) and February marks the driest period (1.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 17° | 1.3″ | 4 |
| February | 20° | 1.1″ | 4 |
| March | 31° | 1.9″ | 6 |
| April | 43° | 3.1″ | 10 |
| May | 56° | 3.6″ | 12 |
| June | 65° | 4.2″ | 14 |
| July | 69° | 3.7″ | 12 |
| August | 68° | 3.4″ | 11 |
| September | 60° | 3.4″ | 11 |
| October | 49° | 2.8″ | 9 |
| November | 36° | 2.0″ | 7 |
| December | 24° | 1.8″ | 6 |
Regional context
Green Bay belongs to a warm-summer humid continental climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities.
Similar climates: Milwaukee, WI, Madison, WI, Appleton, WI, Racine, WI, Kenosha, 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?
- Green Bay's last spring frost typically occurs around mid-May, with the first fall frost returning around mid-October.
- What is the rainy season in Green Bay?
- June receives the most rainfall with about 4.2 inches on average; the city gets roughly 32 inches annually.
- What is the warmest month in Green Bay?
- July typically brings the warmest weather, averaging about 69°F.
- What is the coldest month in Green Bay?
- January typically delivers the coldest temperatures, averaging about 17°F.
- When can I start a vegetable garden in Green Bay?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Green Bay get?
- Green Bay experiences about 106 rainy days per year on average.
- What hardiness zone is Green Bay?
- Green Bay's USDA hardiness zone depends on its lowest average winter temperature; use the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Green Bay, Wisconsin experiences a warm-summer humid continental climate zone. January temperatures hover near 17°F while July averages 69°F — creating a 53°F seasonal swing.
Throughout the year, Green Bay receives about 32 inches of precipitation spread over roughly 106 rainy days.
Latitude (44.5°N), proximity to large water bodies, and elevation determine the rhythm of the year — shaping what grows here, when frost arrives, and daily weather patterns.