Mequon weather in May

In May, Mequon sees average daytime highs of 60°F and overnight lows near 47°F, with 3.6 in of rain across 11.1 wet days and about 14.4 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 56°F in the first days to 65°F by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 54 min at the start of May to 14 h 54 min by month's end. Set against the rest of the year, May is Mequon's 6th-clearest and 9th-windiest month. For the whole year in context, see Mequon's year-round climate.

Daytime high
60°
5th warmest
Overnight low
47°
8th coldest
Rainfall
3.6 in
11.1 wet days
Daylight
14 h 30 min
4:34 AM – 7:03 PM
Cloud cover
64%
6th clearest
Wind
9 mph
9th windiest
Solar energy
5.88 kWh/m²
Travel score
4.7
out of 10

Mequon is fourth-class city in Ozaukee County, Wisconsin, United States.

Density
183/km²
people per km²
Founded
1957

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 56°F in the first days to 65°F by the end.

A typical May day in Mequon reaches about 60°F in the afternoon and slips back to 47°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 50°F and 71°F. Set against its neighbours, May runs about 10°F warmer than April and about 11°F cooler than June.

30°40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
15542
25543
35643
45643
55644
65744
75744
85845
95845
105845
115846
125946
135946
146046
156047
166047
176147
186148
196148
206249
216249
226349
236350
246350
256451
266451
276451
286552
296552
306653
316653

How May really feels in Mequon

Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Mequon weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 17°2.08.96.89.20.0
Feb31° / 19°1.86.85.610.20.0
Mar40° / 27°2.49.2411.60.2
Apr50° / 37°4.011.61.813.22.1
May60° / 47°3.611.1014.44.7
Jun71° / 59°3.510.7015.16.5
Jul78° / 65°3.19.7014.96.9
Aug77° / 65°3.510.2013.86.9
Sep70° / 57°3.08.9012.36.7
Oct58° / 46°3.19.60.210.84.3
Nov44° / 34°2.48.81.89.51.0
Dec34° / 24°2.28.15.38.90.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24060
33961
43961
53961
63862
73961
83961
93961
104060
114060
124060
134159
144060
154258
164258
174258
184357
194357
204357
214456
224456
234456
244555
254555
264555
274654
284753
294753
304753
314852

Chance of precipitation in May

Any precipitation

Mequon gets around 3.6 in of rain over 11.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
637
737
837
937
1037
1136
1236
1336
1436
1536
1636
1736
1836
1936
2036
2135
2235
2335
2435
2535
2635
2735
2835
2935
3035
3135

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 88% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
199100
298200
398200
498200
597300
696310
795410
895410
994510
1094510
1193610
1293610
1393610
1492710
1591720
1690820
1790820
1888930
1988930
20861040
21851050
22841150
23821260
24811270
25801370
26791380
27781480
28761590
29761590
30741691
317217101

Wind in May

Winds average 9 mph in May.

Across May, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 54 min at the start of May to 14 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 4:53 AM to 4:22 AM, and sunset from 6:46 PM to 7:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.94:536:46
213.94:526:47
314.04:506:48
414.04:496:49
514.04:476:50
614.14:466:51
714.14:456:53
814.24:436:54
914.24:426:55
1014.34:416:56
1114.34:406:57
1214.34:396:58
1314.44:376:59
1414.44:367:00
1514.44:357:02
1614.54:347:03
1714.54:337:04
1814.54:327:05
1914.64:317:06
2014.64:307:07
2114.64:297:08
2214.74:287:09
2314.74:277:10
2414.74:277:11
2514.84:267:12
2614.84:257:13
2714.84:247:14
2814.94:247:15
2914.94:237:16
3014.94:227:16
3114.94:227:17

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.88 kWh/m².

For context, solar energy here swings from a low near 1.47 kWh/m² to a high of 6.43 kWh/m² in June across the year — May's 5.88 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.6Bright
75.6Bright
85.6Bright
95.7Bright
105.7Bright
115.7Bright
125.8Bright
135.8Bright
145.8Bright
155.9Bright
165.9Bright
175.9Bright
186.0Bright
196.0Intense
206.0Intense
216.1Intense
226.1Intense
236.1Intense
246.1Intense
256.1Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in May

Is May a good time to visit Mequon?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.7
Sightseeing
5th-best month of the year
0.8
Beach & pool
5th-best month of the year

May is a reasonable time to visit Mequon for sightseeing.

What to pack for Mequon in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Mequon sees daytime highs around 60°F and nights near 47°F. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

Sea temperature near Mequon in May

The nearest coast averages about 42°F in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 10 mi away) is warmest in August at about 70°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 29 to Aug 30 — about 1.1 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr38Bracing
May42Bracing
Jun54Bracing
Jul67Cool
Aug70Refreshing
Sep66Cool
Oct56Bracing
Nov46Bracing
Dec41Bracing

UV index in Mequon in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mequon peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Mequon in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Mequon is worst in June — around 16 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 2116 µg/m³Nov 138 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar14Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul15Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Mequon?

Mequon sits at 43.2°N, 88.0°W, 669 ft above sea level, in United States. The nearest listed city is Germantown, 4.3 mi away.

Topography around Mequon

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Mequon.

Within 2 miles, the terrain around Mequon has only modest variations in elevation — a maximum elevation change of 295 ft around an average of 764 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 587 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 846 ft.

The land around Mequon is covered by trees (35%), grassland (33%) and cropland (25%) within 2 miles, trees (40%) and grassland (22%) within 10 miles, and water (38%) and cropland (27%) within 50 miles.

2 miles
295 ft
10 miles
587 ft
50 miles
846 ft
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Germantown 4.3 mi · Menomonee Falls 5.0 mi · Brookfield 11 mi · Wauwatosa 12 mi · Milwaukee 14 mi · West Allis 14 mi · West Bend 16 mi · New Berlin 17 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mequon (43.2156°, -88.03°, elevation 669 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).