Green Bay weather in May: Green Bay, Wisconsin: normal highs, lows, rain and records for May
Green Bay in May has a normal high of 67°F and a normal low of 46°F, a daily mean of 57°F, rising from 61°F on the 1st to 72°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 3.35 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 8°C, 85 mm of precipitation in May.
- NOAA stationGreen Bay A S International Airport
- Station IDUSW00014898
- Location44.50°N 88.11°W
- Elevation682 ft (208 m)
- From the center6 miles
- Population106,311
- Jan 26° 11°
- Feb 29° 13°
- Mar 40° 24°
- Apr 54° 35°
- May 67° 46°
- Jun 77° 56°
- Jul 81° 60°
- Aug 79° 58°
- Sep 72° 50°
- Oct 58° 40°
- Nov 44° 29°
- Dec 31° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Green Bay in May?
The normal high is 67°F and the normal low 46°F, for a daily mean of 56.5°F. May is 12.2°F warmer than April and 9.9°F cooler than June. May is the 5th warmest month of the year in Green Bay and the 4th wettest. Across the month the normal high rises 11°F, from 61°F on May 1 to 72°F on May 31. From one year to the next May's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 53°F and 60°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 61°F | 40°F | 39% | 23% |
| May 8 | 64°F | 43°F | 39% | 23% |
| May 15 | 67°F | 46°F | 39% | 23% |
| May 22 | 70°F | 48°F | 40% | 24% |
| May 31 | 72°F | 52°F | 40% | 25% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 61°F | 40°F | 39% | 23% | 14 h 10 min |
| May 2 | 62°F | 41°F | 39% | 23% | 14 h 10 min |
| May 3 | 62°F | 41°F | 39% | 23% | 14 h 20 min |
| May 4 | 62°F | 41°F | 39% | 23% | 14 h 20 min |
| May 5 | 63°F | 42°F | 39% | 23% | 14 h 20 min |
| May 6 | 63°F | 42°F | 39% | 23% | 14 h 20 min |
| May 7 | 64°F | 43°F | 39% | 23% | 14 h 30 min |
| May 8 | 64°F | 43°F | 39% | 23% | 14 h 30 min |
| May 9 | 65°F | 43°F | 39% | 23% | 14 h 30 min |
| May 10 | 65°F | 44°F | 39% | 23% | 14 h 30 min |
| May 11 | 65°F | 44°F | 39% | 23% | 14 h 40 min |
| May 12 | 66°F | 45°F | 39% | 23% | 14 h 40 min |
| May 13 | 66°F | 45°F | 39% | 23% | 14 h 40 min |
| May 14 | 67°F | 45°F | 39% | 23% | 14 h 40 min |
| May 15 | 67°F | 46°F | 39% | 23% | 14 h 50 min |
| May 16 | 67°F | 46°F | 39% | 23% | 14 h 50 min |
| May 17 | 68°F | 46°F | 39% | 23% | 14 h 50 min |
| May 18 | 68°F | 47°F | 39% | 23% | 14 h 50 min |
| May 19 | 68°F | 47°F | 40% | 23% | 14 h 50 min |
| May 20 | 69°F | 48°F | 40% | 23% | 15 h |
| May 21 | 69°F | 48°F | 40% | 24% | 15 h |
| May 22 | 70°F | 48°F | 40% | 24% | 15 h |
| May 23 | 70°F | 49°F | 40% | 24% | 15 h |
| May 24 | 70°F | 49°F | 40% | 24% | 15 h |
| May 25 | 71°F | 50°F | 40% | 24% | 15 h 10 min |
| May 26 | 71°F | 50°F | 40% | 24% | 15 h 10 min |
| May 27 | 71°F | 50°F | 40% | 24% | 15 h 10 min |
| May 28 | 71°F | 51°F | 40% | 24% | 15 h 10 min |
| May 29 | 72°F | 51°F | 40% | 24% | 15 h 10 min |
| May 30 | 72°F | 51°F | 40% | 24% | 15 h 10 min |
| May 31 | 72°F | 52°F | 40% | 25% | 15 h 20 min |
- Normal high
- 67°FMay average
- Normal low
- 46°FMay average
- Precipitation
- 3.35 inmonth total
- Days with precipitation
- 120.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 14 h 10 min to 15 h 20 minMay 1 to May 31
- Days at 70°F or more
- 13
- Days at 80°F or more
- 5
- Sunshine
- 71%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014898; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Green Bay in May?
On a given May day the chance of 0.01 inch or more is 39% on average, highest around May 27 (40%). In all, 3.35 in falls on 12 days of a normal May, 1 of them with an inch or more.
In a normal May in Green Bay, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014898.
How humid and windy is Green Bay in May?
At 3 p.m. the normal temperature is 70°F with 52% relative humidity and a dew point of 52°F; at 6 a.m. it is 56°F with 81% humidity. The wind averages 8.2 mph, most often from the south-southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 56°F | 50°F | 81% | 6.6 mph | 54% |
| 9 a.m. | 64°F | 52°F | 65% | 9.5 mph | 56% |
| noon | 69°F | 52°F | 55% | 10.8 mph | 52% |
| 3 p.m. | 70°F | 52°F | 52% | 11.3 mph | 54% |
| 6 p.m. | 67°F | 51°F | 56% | 9.6 mph | 56% |
| 9 p.m. | 60°F | 51°F | 74% | 6.5 mph | 62% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014898. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Green Bay?
The warmest May temperature on Green Bay's official record (since 1886) is 99°F, on May 31, 1934; the coldest is 21°F, on May 9, 1966. The wettest May brought 9.70 in (1918); the snowiest, 4.3 inches (1990).
The May mean against the 1991-2020 normal of 56.5°F: 2021 56.8°F (+0.3), 2022 60.9°F (+4.4), 2023 57.6°F (+1.1), 2024 59.7°F (+3.2), 2025 56.2°F (−0.3), 2026 55.4°F (−1.1). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.8°F | +0.3°F | 2.16 in |
| 2022 | 60.9°F | +4.4°F | 1.99 in |
| 2023 | 57.6°F | +1.1°F | 1.33 in |
| 2024 | 59.7°F | +3.2°F | 5.13 in |
| 2025 | 56.2°F | −0.3°F | 2.43 in |
| 2026 | 55.4°F | −1.1°F | 2.23 in |
Source: records: ACIS, NWS threaded record GRBthr; recent months: ACIS, station USW00014898. Records and recent months use complete months only.
How does May in Green Bay compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, May normal highs run from 57°F in Superior to 73°F in Mondovi; Green Bay's is 67°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.