Fairview Heights weather in May

In May, Fairview Heights sees average daytime highs of 76°F and overnight lows near 58°F, with 5.1 in of rain across 13.3 wet days and about 14.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 72°F in the first days to 80°F by the end. The sky is clear or mostly clear about 27% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of May to 14 h 30 min by month's end. Set against the rest of the year, May is Fairview Heights's 8th-clearest and 8th-windiest month. For the whole year in context, see Fairview Heights's year-round climate.

Daytime high
76°
5th warmest
Overnight low
58°
8th coldest
Rainfall
5.1 in
13.3 wet days
Daylight
14 h 06 min
4:53 AM – 6:59 PM
Cloud cover
62%
8th clearest
Wind
7 mph
8th windiest
Solar energy
5.84 kWh/m²
Travel score
6.3
out of 10

Fairview Heights is city in St. Clair County, Illinois, United States.

Density
561/km²
people per km²

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 72°F in the first days to 80°F by the end.

A typical May day in Fairview Heights reaches about 76°F in the afternoon and slips back to 58°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 87°F. Set against its neighbours, May runs about 9°F warmer than April and about 9°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17153
27254
37254
47354
57355
67355
77456
87456
97456
107456
117557
127557
137558
147658
157658
167658
177659
187759
197759
207860
217860
227860
237861
247961
257962
267962
278062
288063
298063
308163
318164

How May really feels in Fairview Heights

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.

Fairview Heights 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
Jan40° / 25°2.98.32.99.60.0
Feb45° / 29°2.67.62.610.51.0
Mar56° / 38°3.810.81.311.73.7
Apr67° / 48°4.811.50.1135.9
May76° / 58°5.113.3014.16.3
Jun85° / 67°4.110.8014.65.2
Jul88° / 71°3.49.8014.44.6
Aug86° / 68°2.99.1013.55.1
Sep80° / 60°3.27.6012.37.0
Oct68° / 49°3.58.40116.7
Nov55° / 38°3.78.70.69.93.6
Dec44° / 29°2.88.529.40.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24258
34159
44159
54258
64159
74159
84060
94159
104159
114258
124159
134159
144159
154159
164159
174159
184159
194060
204159
214159
224159
234258
244258
254159
264357
274357
284357
294456
304456
314555

Chance of precipitation in May

Any precipitation

Fairview Heights gets around 5.1 in of rain over 13.3 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 42% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
545
644
744
844
943
1043
1143
1242
1342
1442
1542
1642
1743
1843
1943
2043
2142
2242
2342
2441
2541
2640
2740
2839
2939
3038
3138

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 49% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
170181020
268191120
366191230
464191430
561201540
660201640
759191750
858191760
957191860
1056181970
1154182080
1254172090
13521721100
14521621110
15511621120
16501521140
17491521150
18481421160
19471421181
20461322191
21441322201
22431322211
23411322231
24391422241
25381422242
26361522252
27351522262
28331622272
29321722272
30301722282
31291822293

Wind in May

Winds average 7 mph in May.

Across May, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
87light breeze
97light breeze
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 36 min at the start of May to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:10 AM to 4:43 AM, and sunset from 6:45 PM to 7:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:106:45
213.65:086:46
313.75:076:47
413.75:066:48
513.75:056:49
613.85:046:50
713.85:026:51
813.85:016:52
913.95:006:52
1013.94:596:53
1113.94:586:54
1214.04:576:55
1314.04:566:56
1414.04:556:57
1514.14:546:58
1614.14:536:59
1714.14:537:00
1814.24:527:01
1914.24:517:02
2014.24:507:03
2114.24:497:03
2214.34:497:04
2314.34:487:05
2414.34:477:06
2514.34:477:07
2614.44:467:08
2714.44:457:08
2814.44:457:09
2914.44:447:10
3014.44:447:11
3114.54:437:11

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.84 kWh/m².

For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 6.47 kWh/m² in June across the year — May's 5.84 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.5Bright
45.5Bright
55.5Bright
65.6Bright
75.6Bright
85.7Bright
95.7Bright
105.7Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
196.0Bright
206.0Bright
216.0Bright
226.0Intense
236.0Intense
246.0Intense
256.0Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
316.1Intense
Planning a trip in May

Is May a good time to visit Fairview Heights?

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

6.3
Sightseeing
3rd-best month of the year
5.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Fairview Heights for sightseeing.

What to pack for Fairview Heights in May

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

In May, Fairview Heights sees daytime highs around 76°F and nights near 58°F. Worth packing: light clothes, rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Fairview Heights 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 Fairview Heights peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Fairview Heights 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 Fairview Heights is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb12Good
Mar12Good
Apr11Good
May14Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Moderate
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Fairview Heights?

Fairview Heights sits at 38.6°N, 90.0°W, 584 ft above sea level, in United States. The nearest listed city is O'Fallon, 4.3 mi away.

Topography around Fairview Heights

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

Within 2 miles, the terrain around Fairview Heights has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 577 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 358 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 974 ft.

The land around Fairview Heights is covered by trees (46%) and artificial surfaces (22%) within 2 miles, trees (40%) and cropland (31%) within 10 miles, and cropland (46%) and trees (41%) within 50 miles.

2 miles
141 ft
10 miles
358 ft
50 miles
974 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: O'Fallon 4.3 mi · Belleville 5.0 mi · Collinsville 5.6 mi · East Saint Louis 8.7 mi · St. Louis 12 mi · Granite City 12 mi · Edwardsville 16 mi · Lemay 16 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 Fairview Heights (38.5889°, -89.9904°, elevation 584 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. 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).