Green Bay weather in January 2026

Expect -5°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Green Bay in January based on long-term weather averages. There is usually 11 days with some rainfall and 30 mm of average monthly rainfall in January.

  • -5°C maximum daytime temperature in January in Green Bay-5
    -5°C max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in January in Green Bay11
    11 days with some rainfall
  • -15°C minimum night-time temperature in January in Green Bay-15
    -15°C min night temperature
  • 9 hours of daylight per day in January in Green Bay9
    9 hours of daylight per day
  • No heat & humidity in January in Green Bay0
    No heat & humidity
  • 30 mm monthly rainfall in January in Green Bay30
    30 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Green Bay1
    1 (Low) UV index
  • 4°C sea temperature in January in Green Bay4
    4°C sea temperature

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The January weather guide for Wisconsin (Green Bay) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How cold is it in Green Bay in January?

Daytime temperatures usually reach -5°C in Green Bay in January, falling to -15°C at night.

How sunny is it in Green Bay in January?

There are normally 5 hours of bright sunshine each day in Green Bay in January - that's 51% of daylight hours.

Is the sea cold around Green Bay in January?

The average sea temperature around Green Bay in January is 4°C.

Does it rain in Green Bay in January?

There are usually 11 days with some rain in Green Bay in January and the average monthly rainfall is 30mm. Rain may fall as snow in this month.

Green Bay January sunrise & sunset times

Browse the sunrise and sunset times for Green Bay in January 2026. Select a month to view Green Bay sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:29 16:23
Friday, 16th January 2026 07:24 16:40
Saturday, 31st January 2026 07:12 17:00

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