Sewell weather in May

In May, Sewell sees average daytime highs of 73°F and overnight lows near 55°F, with 3.3 in of rain across 10.3 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 69°F in the first days to 77°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 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 Sewell's 12th-clearest and 8th-windiest month. For the whole year in context, see Sewell's year-round climate.

Daytime high
73°
5th warmest
Overnight low
55°
8th coldest
Rainfall
3.3 in
10.3 wet days
Daylight
14 h 12 min
4:51 AM – 7:02 PM
Cloud cover
62%
12th clearest
Wind
7 mph
8th windiest
Solar energy
5.7 kWh/m²
Travel score
6.6
out of 10

Sewell is unincorporated community in New Jersey, United States of America.

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 69°F in the first days to 77°F by the end.

A typical May day in Sewell reaches about 73°F in the afternoon and slips back to 55°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 62°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)
16951
26951
36951
46951
57052
67052
77052
87053
97153
107153
117153
127154
137254
147254
157255
167355
177355
187355
197456
207456
217456
227557
237557
247558
257658
267658
277659
287759
297760
307760
317860

How May really feels in Sewell

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.

Sewell weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan41° / 28°3.19.23.49.50.1
Feb44° / 29°2.98.73.110.40.8
Mar53° / 36°4.010.7211.72.8
Apr64° / 46°3.410.20.3135.5
May73° / 55°3.310.3014.26.6
Jun82° / 65°3.710.2014.86.0
Jul86° / 70°3.610.7014.55.0
Aug84° / 68°3.810.3013.65.6
Sep78° / 61°3.99.1012.36.9
Oct66° / 50°3.67.8010.96.4
Nov55° / 39°2.980.29.83.8
Dec46° / 32°3.88.91.89.21.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34753
44654
54753
64654
74654
84654
94654
104654
114753
124753
134654
144654
154654
164654
174555
184555
194555
204456
214456
224456
234456
244555
254555
264555
274555
284456
294456
304555
314456

Chance of precipitation in May

Any precipitation

Sewell gets around 3.3 in of rain over 10.3 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 33% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
432
532
632
733
833
933
1033
1133
1233
1333
1433
1533
1633
1733
1833
1933
2034
2134
2234
2334
2434
2533
2633
2733
2833
2933
3033
3133

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 63% 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 (%)
18212510
28113510
38013610
47914610
57814710
67615810
77615810
87515910
973151020
1073151020
1172151120
1270151230
1369161230
1468161330
1567161340
1666161440
1763171550
1863171550
1961171660
2058181770
2156181871
2255181881
2353181991
24501920101
25491921101
26481921111
27461922112
28451922122
29432022132
30422023132
31412023142

Wind in May

Winds average 7 mph in May.

Across May, daily wind ranges from about 7 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
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 6:47 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:086:47
213.75:076:49
313.75:066:50
413.85:046:51
513.85:036:52
613.85:026:53
713.95:016:54
813.95:006:55
914.04:586:56
1014.04:576:57
1114.04:566:58
1214.14:556:59
1314.14:546:59
1414.14:537:00
1514.24:527:01
1614.24:517:02
1714.24:507:03
1814.24:497:04
1914.34:497:05
2014.34:487:06
2114.34:477:07
2214.44:467:08
2314.44:457:09
2414.44:457:10
2514.44:447:10
2614.54:437:11
2714.54:437:12
2814.54:427:13
2914.54:427:14
3014.64:417:15
3114.64:417:15

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 1.86 kWh/m² to a high of 6.1 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
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
316.0Bright
Planning a trip in May

Hazard calendar for Sewell

In seasonPeak

None of Sewell's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Sewell sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Sewell?

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

6.6
Sightseeing
2nd-best month of the year
4.9
Beach & pool
5th-best month of the year

May is a reasonable time to visit Sewell for sightseeing.

What to pack for Sewell in May

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

In May, Sewell sees daytime highs around 73°F and nights near 55°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Sewell 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 Sewell peaks around July 11 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 11UV 8Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Sewell 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 Sewell is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar15Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Good
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Sewell?

Sewell sits at 39.8°N, 75.1°W, 66 ft above sea level, in United States. The nearest listed city is Glassboro, 5.0 mi away.

Topography around Sewell

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

Within 2 miles, the terrain around Sewell has only modest variations in elevation — a maximum elevation change of 184 ft around an average of 89 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 259 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,365 ft.

The land around Sewell is covered by trees (67%) and grassland (20%) within 2 miles, trees (52%) within 10 miles, and trees (57%) within 50 miles.

2 miles
184 ft
10 miles
259 ft
50 miles
1,365 ft
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Glassboro 5.0 mi · Lindenwold 8.7 mi · Williamstown 9.9 mi · Sicklerville 9.9 mi · Whitman 11 mi · Lower Moyamensing 11 mi · Wharton 11 mi · Camden 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 Sewell (39.7665°, -75.1443°, elevation 66 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).