Mount Lebanon weather in May

In May, Mount Lebanon sees average daytime highs of 71°F and overnight lows near 52°F, with 5.0 in of rain across 14.4 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 67°F in the first days to 74°F by the end. The sky is clear or mostly clear about 20% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of May to 14 h 36 min by month's end. Set against the rest of the year, May is Mount Lebanon's 6th-clearest and 8th-windiest month. For the whole year in context, see Mount Lebanon's year-round climate.

Daytime high
71°
5th warmest
Overnight low
52°
8th coldest
Rainfall
5.0 in
14.4 wet days
Daylight
14 h 12 min
5:09 AM – 7:23 PM
Cloud cover
65%
6th clearest
Wind
6 mph
8th windiest
Solar energy
5.57 kWh/m²
Travel score
5.8
out of 10

Mount Lebanon is municipality in Allegheny County, Pennsylvania, United States.

Founded
1912

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 67°F in the first days to 74°F by the end.

A typical May day in Mount Lebanon reaches about 71°F in the afternoon and slips back to 52°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 59°F and 83°F. Set against its neighbours, May runs about 9°F warmer than April and about 8°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16748
26748
36748
46749
56849
66849
76850
86950
96950
106950
116951
126951
137051
147051
157052
167052
177152
187153
197153
207253
217253
227254
237354
247355
257355
267455
277455
287456
297456
307556
317557

How May really feels in Mount Lebanon

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.

Mount Lebanon weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 24°3.612.26.89.50.0
Feb41° / 25°3.211.15.510.40.2
Mar50° / 33°4.4133.511.72.1
Apr62° / 43°4.613.80.9134.7
May71° / 52°5.014.4014.25.8
Jun79° / 61°5.213.9014.86.0
Jul82° / 65°5.014.4014.65.6
Aug81° / 63°3.812.2013.66.2
Sep75° / 56°3.910012.36.8
Oct63° / 45°3.610.40.210.95.4
Nov51° / 36°3.5101.29.82.5
Dec42° / 29°3.511.44.29.20.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23565
33565
43565
53565
63565
73664
83664
93664
103664
113763
123664
133763
143862
153763
163763
173763
183862
193763
203763
213763
223961
233961
244060
254159
264258
274258
284258
294357
304357
314258

Chance of precipitation in May

Any precipitation

Mount Lebanon gets around 5.0 in of rain over 14.4 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 47% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
149
249
349
449
549
649
749
849
949
1049
1149
1249
1349
1449
1548
1648
1747
1847
1946
2046
2145
2245
2344
2444
2544
2644
2743
2843
2943
3043
3143

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 62% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
18213500
28113600
37914700
47815700
57715800
67516900
77416910
872171010
971171110
1071171110
1168181220
1268181220
1367181320
1466181420
1564191430
1663191530
1761191640
1861191640
1959191750
2058191760
2155201870
2255201870
2353201980
2452201990
25502119101
26492119111
27482120111
28472120121
29462120131
30452120131
31442021141

Wind in May

Winds average 6 mph in May.

Across May, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 36 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 5:27 AM to 4:59 AM, and sunset from 7:08 PM to 7:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:277:08
213.75:257:09
313.85:247:10
413.85:237:11
513.85:227:12
613.95:207:13
713.95:197:14
814.05:187:15
914.05:177:16
1014.05:167:17
1114.15:157:18
1214.15:147:19
1314.15:127:20
1414.25:117:21
1514.25:107:22
1614.25:097:23
1714.35:097:24
1814.35:087:25
1914.35:077:26
2014.45:067:27
2114.45:057:28
2214.45:047:29
2314.45:047:30
2414.55:037:31
2514.55:027:32
2614.55:017:33
2714.55:017:33
2814.65:007:34
2914.65:007:35
3014.64:597:36
3114.64:597:37

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.57 kWh/m².

For context, solar energy here swings from a low near 1.53 kWh/m² to a high of 5.94 kWh/m² in June across the year — May's 5.57 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.4Bright
135.4Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.6Bright
195.6Bright
205.6Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in May

Is May a good time to visit Mount Lebanon?

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

5.8
Sightseeing
4th-best month of the year
3.8
Beach & pool
5th-best month of the year

May is a reasonable time to visit Mount Lebanon for sightseeing.

What to pack for Mount Lebanon in May

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

In May, Mount Lebanon sees daytime highs around 71°F and nights near 52°F. Pack rain gear. Worth having: sun protection. About 14 days see rain.

rain gearsun protection

UV index in Mount Lebanon 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 Mount Lebanon peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 22UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Mount Lebanon 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 Mount Lebanon is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 147 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr11Good
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

Where is Mount Lebanon?

Mount Lebanon sits at 40.4°N, 80.0°W, 1,060 ft above sea level, in United States. The nearest listed city is Bethel Park, 1.9 mi away.

Topography around Mount Lebanon

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

Within 2 miles, the terrain around Mount Lebanon has only modest variations in elevation — a maximum elevation change of 430 ft around an average of 1,148 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 712 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,356 ft.

The land around Mount Lebanon is covered by trees (68%) and artificial surfaces (23%) within 2 miles, trees (64%) within 10 miles, and trees (76%) within 50 miles.

2 miles
430 ft
10 miles
712 ft
50 miles
2,356 ft
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Bethel Park 1.9 mi · Upper Saint Clair 2.5 mi · Baldwin 3.7 mi · Pittsburgh 6.8 mi · West Mifflin 9.9 mi · McKeesport 9.9 mi · Wilkinsburg 11 mi · Monroeville 14 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 Mount Lebanon (40.3554°, -80.0495°, elevation 1,060 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).