Wasco weather in May

In May, Wasco sees average daytime highs of 69°F and overnight lows near 50°F, with 4.7 in of rain across 12.7 wet days and about 14.3 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 64°F in the first days to 73°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 48 min at the start of May to 14 h 48 min by month's end. Set against the rest of the year, May is Wasco's 6th-clearest and 8th-windiest month. For the whole year in context, see Wasco's year-round climate.

Daytime high
69°
5th warmest
Overnight low
50°
8th coldest
Rainfall
4.7 in
12.7 wet days
Daylight
14 h 24 min
4:39 AM – 7:01 PM
Cloud cover
65%
6th clearest
Wind
9 mph
8th windiest
Solar energy
5.7 kWh/m²
Travel score
5.9
out of 10

Wasco is unincorporated community in Illinois.

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 64°F in the first days to 73°F by the end.

A typical May day in Wasco reaches about 69°F in the afternoon and slips back to 50°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 82°F. Set against its neighbours, May runs about 11°F warmer than April and about 9°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16345
26445
36446
46546
56546
66547
76647
86647
96648
106748
116748
126749
136849
146849
156950
166950
176950
186951
197051
207051
217152
227152
237152
247153
257253
267254
277354
287354
297355
307355
317455

How May really feels in Wasco

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.

Wasco weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 16°2.07.95.69.30.0
Feb34° / 19°1.974.810.30.0
Mar46° / 29°2.69.22.911.71.3
Apr58° / 39°4.512.1113.14.0
May69° / 50°4.712.7014.35.9
Jun78° / 60°4.211.90156.4
Jul82° / 64°3.610.7014.76.3
Aug80° / 62°3.610.5013.76.6
Sep73° / 55°3.28.5012.37.0
Oct61° / 43°3.28.80.110.95.1
Nov46° / 32°2.47.91.59.61.5
Dec35° / 22°2.27.94.690.0

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 15% of May, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13664
23565
33565
43565
53565
63664
73664
83664
93862
103862
113862
124060
133961
144060
154060
164159
174159
184258
194258
204357
214357
224258
234159
244258
254258
264258
274258
284258
294258
304357
314357

Chance of precipitation in May

Any precipitation

Wasco gets around 4.7 in of rain over 12.7 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 43% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
242
342
442
543
643
743
843
943
1042
1142
1242
1342
1442
1541
1641
1741
1841
1941
2040
2140
2240
2340
2440
2540
2640
2740
2840
2940
3040
3140

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 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1908110
2898210
3889210
4879310
5879310
68510320
78410420
88311420
98211430
108111530
118012530
128012530
137912630
147713640
157713640
167613740
177414750
187314850
197314850
207015960
217015960
2268151070
2366161170
2466161170
2564161280
2663171280
2761171390
2861171390
2959181490
30571814101
31551915101

Wind in May

Winds average 9 mph in May.

Across May, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 48 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 4:57 AM to 4:27 AM, and sunset from 6:45 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:576:45
213.84:566:46
313.94:546:47
413.94:536:48
514.04:526:49
614.04:506:50
714.04:496:51
814.14:486:52
914.14:476:53
1014.14:466:54
1114.24:446:56
1214.24:436:57
1314.34:426:58
1414.34:416:59
1514.34:407:00
1614.44:397:01
1714.44:387:02
1814.44:377:03
1914.54:367:04
2014.54:357:05
2114.54:347:06
2214.64:337:07
2314.64:337:08
2414.64:327:09
2514.64:317:10
2614.74:307:11
2714.74:307:11
2814.74:297:12
2914.74:287:13
3014.84:287:14
3114.84:277:15

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.7 kWh/m².

For context, solar energy here swings from a low near 1.67 kWh/m² to a high of 6.28 kWh/m² in June across the year — May's 5.7 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.5Bright
95.5Bright
105.5Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
276.0Bright
286.0Bright
296.0Bright
306.0Bright
316.0Intense
Planning a trip in May

Is May a good time to visit Wasco?

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

5.9
Sightseeing
5th-best month of the year
3.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Wasco for sightseeing.

What to pack for Wasco in May

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

In May, Wasco sees daytime highs around 69°F and nights near 50°F. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Wasco in May

The nearest coast averages about 45°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 40 mi away) is warmest in August at about 73°F and coldest in February near 36°F.

It's comfortable for a long swim from Jul 13 to Sep 15 — about 2.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr39Bracing
May45Bracing
Jun57Bracing
Jul70Refreshing
Aug73Refreshing
Sep68Refreshing
Oct58Bracing
Nov49Bracing
Dec42Bracing

UV index in Wasco 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 Wasco peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Wasco 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 Wasco is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1817 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Wasco?

Wasco sits at 41.9°N, 88.4°W, 820 ft above sea level, in United States. The nearest listed city is St. Charles, 5.0 mi away.

Topography around Wasco

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

Within 2 miles, the terrain around Wasco has only modest variations in elevation — a maximum elevation change of 259 ft around an average of 840 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 436 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 892 ft.

The land around Wasco is covered by trees (50%) and grassland (35%) within 2 miles, cropland (41%), trees (25%) and grassland (22%) within 10 miles, and cropland (46%) and trees (20%) within 50 miles.

2 miles
259 ft
10 miles
436 ft
50 miles
892 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: St. Charles 5.0 mi · Geneva 6.2 mi · South Elgin 6.8 mi · Batavia 7.5 mi · Elgin 9.3 mi · North Aurora 9.9 mi · West Chicago 11 mi · Bartlett 12 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 Wasco (41.9381°, -88.4045°, elevation 820 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).