Green Bay, WI weather in May
Green Bay is mild in May, with frequent rain: highs average 67°F and nights drop to about 46°F. There are about 12 days with rain.
- Normal high
- 67°F
- Normal low
- 46°F
- Wet days
- 12
- 3.4 in total
- Muggy days
- 1
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 61°F | 72°F |
| Normal low | 40°F | 52°F |
| Chance of a wet day | 39% | 40% |
| Sunrise / sunset | 5:42 am / 7:56 pm | 5:10 am / 8:28 pm |
| Daylight | 14.2 h | 15.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical May day
- 6 am50°Fdew point 44°F
- 9 am58°Fdew point 45°F
- Noon63°Fdew point 46°F
- 3 pm65°Fdew point 46°F
- 6 pm62°Fdew point 45°F
- 9 pm54°Fdew point 45°F
NOAA hourly normals (local standard time) from Green Bay (5 mi away); average wind 9 mph; clear or few clouds in 54% of daytime hours, mostly cloudy or overcast in 38%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph3 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more1 of 31
- Wet daysat least 0.01 in of rain or melted snow12 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below1 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 3.4 in; a dry May brings about 2.5 in and a wet one about 3.8 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How May varies from year to year
- Warmest May, 1991-20202018: average high 74°F
- Coolest May1997: average high 60°F
- Wettest May2004: 8.3 in
- Driest May1996: 1.4 in
- Highest reading97°F (May 27, 2018)
- Lowest reading25°F (May 12, 2020)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 54°F | 67°F | 77°F |
| Normal low | 35°F | 46°F | 56°F |
| Wet days | 12 | 12 | 11 |
| Comfortable days | 5 | 14 | 14 |
| Daylight | 13.5 h | 14.8 h | 15.5 h |
Highs change by +13°F from April and +10°F into June.
Nearby alternatives in May
- Warmer: Davenport, IA244 mi · high 74°F · 12 wet days
- Cooler: Sister Bay, WI64 mi · high 59°F · 11 wet days
How Green Bay ranks in May
- Normal high316th warmest of 378 cities; 3rd of 5 in Wisconsin
- Wet days299th driest of 378
- Comfortable days152nd most of 339
What to pack for Green Bay in May
- A rain jacket or umbrella – rain on about 12 days
Heating and cooling
May has 288 heating degree days and 26 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How cold is Green Bay in May?
The normal high is 67°F and the normal low is 46°F. From 1991 to 2020 the coldest May reading was 25°F (May 12, 2020).
Does it rain a lot in Green Bay in May?
About 12 days in May have at least 0.01 in of precipitation, and the normal total is 3.4 in. The wettest May in 1991-2020 was in 2004 (8.3 in); the driest was in 1996 (1.4 in).
Is May a good time to visit Green Bay?
May ranks 1st of 12 months on our comfort score for Green Bay (71 out of 100). It has about 14 comfortable days. The best months are May, June and September.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Green Bay (USW00014898), 4.7 mi WSW of the city center, 682 ft (89 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Austin Straubel International Airport (726450-14898), 6.4 mi WSW of the city center, 684 ft (91 ft higher than the city). Hourly observations, 1991-2020.