King of Prussia weather in May

In May, King of Prussia sees average daytime highs of 72°F and overnight lows near 54°F, with 3.7 in of rain across 11.4 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 68°F in the first days to 76°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 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 King of Prussia's 12th-clearest and 8th-windiest month. For the whole year in context, see King of Prussia's year-round climate.

Daytime high
72°
5th warmest
Overnight low
54°
8th coldest
Rainfall
3.7 in
11.4 wet days
Daylight
14 h 12 min
4:52 AM – 7:04 PM
Cloud cover
63%
12th clearest
Wind
7 mph
8th windiest
Solar energy
5.66 kWh/m²
Travel score
6.4
out of 10

King of Prussia is census-designated place in Montgomery County, Pennsylvania, United States.

Density
891/km²
people per km²
Founded
1719

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 68°F in the first days to 76°F by the end.

A typical May day in King of Prussia reaches about 72°F in the afternoon and slips back to 54°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 60°F and 84°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)
16850
26850
36850
46851
56951
66951
76952
86952
97052
107052
117053
127153
137153
147153
157154
167254
177254
187255
197355
207355
217356
227456
237456
247557
257557
267558
277658
287658
297659
307759
317759

How May really feels in King of Prussia

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.

King of Prussia weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 27°3.39.43.99.50.0
Feb43° / 28°3.09.23.510.40.4
Mar51° / 35°4.110.72.811.72.5
Apr63° / 45°3.810.80.3135.2
May72° / 54°3.711.4014.26.4
Jun81° / 64°4.211.3014.86.0
Jul85° / 69°4.211.4014.65.0
Aug83° / 67°3.910.5013.65.7
Sep77° / 60°4.59.6012.36.9
Oct65° / 49°3.78.50.110.96.1
Nov54° / 39°3.080.39.83.4
Dec44° / 31°4.09.429.20.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24654
34555
44555
54654
64555
74555
84654
94555
104555
114555
124555
134555
144456
154456
164456
174357
184456
194456
204357
214357
224357
234357
244456
254456
264456
274456
284456
294456
304357
314357

Chance of precipitation in May

Any precipitation

King of Prussia gets around 3.7 in of rain over 11.4 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 37% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
636
736
836
936
1037
1137
1237
1337
1437
1537
1637
1737
1837
1937
2037
2137
2237
2337
2437
2537
2637
2737
2837
2937
3037
3137

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 65% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
18312410
28312410
38113510
48014510
57914610
67914610
77715710
87715710
97615810
107415920
117316920
1272161020
1371161030
1470161130
1568161240
1668161240
1766161350
1865171350
1963171460
2060181570
2159181580
2258181680
2356181790
24521918101
25511919101
26501919111
27491920111
28481921111
29471921121
30461921121
31452022131

Wind in May

Winds average 7 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
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
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 5:08 AM to 4:41 AM, and sunset from 6:49 PM to 7:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:086:49
213.75:076:50
313.85:066:51
413.85:056:52
513.85:036:53
613.95:026:54
713.95:016:55
813.95:006:56
914.04:596:57
1014.04:586:58
1114.04:576:59
1214.14:567:00
1314.14:547:01
1414.14:537:02
1514.24:527:03
1614.24:527:04
1714.24:517:05
1814.34:507:06
1914.34:497:07
2014.34:487:08
2114.44:477:09
2214.44:467:10
2314.44:467:11
2414.44:457:12
2514.54:447:12
2614.54:447:13
2714.54:437:14
2814.54:427:15
2914.64:427:16
3014.64:417:16
3114.64:417:17

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.66 kWh/m².

For context, solar energy here swings from a low near 1.81 kWh/m² to a high of 6.06 kWh/m² in June across the year — May's 5.66 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in May

Is May a good time to visit King of Prussia?

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

6.4
Sightseeing
2nd-best month of the year
4.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit King of Prussia for sightseeing.

What to pack for King of Prussia in May

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

In May, King of Prussia sees daytime highs around 72°F and nights near 54°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in King of Prussia 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 King of Prussia peaks around July 10 at about 8 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 10UV 8Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in King of Prussia 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 King of Prussia is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 128 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is King of Prussia?

King of Prussia sits at 40.1°N, 75.4°W, 200 ft above sea level, in United States. The nearest listed city is Wayne, 3.1 mi away.

Topography around King of Prussia

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

Within 2 miles, the terrain around King of Prussia has only modest variations in elevation — a maximum elevation change of 512 ft around an average of 210 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,004 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,936 ft.

The land around King of Prussia is covered by trees (56%) and artificial surfaces (27%) within 2 miles, trees (68%) within 10 miles, and trees (58%) within 50 miles.

2 miles
512 ft
10 miles
1,004 ft
50 miles
1,936 ft
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Wayne 3.1 mi · Radnor 3.7 mi · Norristown 3.7 mi · Phoenixville 6.8 mi · Havertown 8.7 mi · Overbrook 11 mi · East Mount Airy 11 mi · Drexel Hill 11 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 King of Prussia (40.0893°, -75.396°, elevation 200 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).