Green Bay, Wisconsin UV Index
Green Bay UV index today — burn time, EPA scale, and sun-protection guidance
Green Bay, WI · UV Index right now
Skin burns in ~38 min
UV 3.5Moderate
A UV index of 3.5 means unprotected skin can begin to burn in roughly 25 minutes for the most sun-sensitive skin types (Fitzpatrick type I).
Peak UV today: 10:58 AM–2:58 PM
Estimated from today’s sunrise and sunset: UV is strongest in the two hours either side of solar noon (12:58 PM local time).
EPA UV Index scale
Current reading: UV 3.5 — Moderate.
Sun protection right now
- SPF & cover-up
- Wear SPF 30+ broad-spectrum sunscreen, a hat, and sunglasses; seek shade near midday.
- Reapply
- Reapply every two hours and after swimming or heavy sweating.
- Safe exposure
- Unprotected fair-to-medium (Fitzpatrick III) skin can begin to burn in about 38 minutes at this UV level. Sunscreen, shade, and cover-up extend that window.
EPA / WHO sun-safety guidance; type III skin baseline. Current band: Moderate.
Burn time by skin type
The current UV index is 3.5 (Moderate) — unprotected skin can begin to redden fastest for the fairest (Fitzpatrick type I) skin and slowest for the darkest (type VI).
See the full minutes-to-burn table for every UV level and all six skin types in the sunburn-time guide.
Sun protection for today's UV
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UV through the year in Green Bay
This far north the sun sits low for much of the year, so UV in Green Bay is concentrated in the high-summer months and peaks in June, when the estimated clear-sky peak UV index reaches about 11 around solar noon. At that peak the noon sun reaches about 69° above the horizon. Each month below pairs the noon sun elevation with the estimated peak UV and how fast unprotected skin can begin to redden.
| Month | Noon sunelevation | Peak UVclear-sky est. | Type Imin to burn | Type IIImin to burn | Type VImin to burn |
|---|---|---|---|---|---|
| January | 24° | 1 | — | — | — |
| February | 33° | 3 | 30 | 44 | 148 |
| March | 43° | 5 | 18 | 27 | 89 |
| April | 55° | 8 | 11 | 17 | 56 |
| May | 64° | 10 | 9 | 13 | 44 |
| June | 69° | 11 | 8 | 12 | 40 |
| July | 67° | 10 | 9 | 13 | 44 |
| August | 60° | 9 | 10 | 15 | 49 |
| September | 48° | 6 | 15 | 22 | 74 |
| October | 37° | 4 | 22 | 33 | 111 |
| November | 27° | 2 | — | — | — |
| December | 22° | 1 | — | — | — |
Clear-sky estimate from sun angle and elevation — day-to-day clouds and ozone shift the real index up or down. Burn times are first-redness approximations for unprotected skin, not a safe-exposure budget.
Frequently asked
- When is UV strongest in Green Bay?
- In Green Bay the sun rides highest around June, when the estimated clear-sky peak UV index reaches about 11. Within any day it peaks near solar noon — roughly 10 a.m. to 4 p.m. local time. It is also stronger at higher elevation and near reflective surfaces like water, sand, and snow.
- Can you get sunburned on a cloudy day in Green Bay?
- Yes. Up to about 80% of UV radiation passes through clouds, so you can still burn in Green Bay on an overcast day. The WHO notes that thin or scattered cloud offers little protection — check the UV Index, not the sky.
UV & sun-safety guides
See how the UV Index works — including why clouds are no shield — plus evergreen guides to burn time, vitamin D, skin-cancer risk, and when UV is strongest, collected on the UV Index hub.
More for Green Bay
See the full Green Bay, WI weather forecast — hour-by-hour outlook, NOAA radar, satellite, and air quality.