Greater Upper Marlboro weather in May

In May, Greater Upper Marlboro sees average daytime highs of 74°F and overnight lows near 58°F, with 3.7 in of rain across 10.7 wet days and about 14.1 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 70°F in the first days to 78°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 Greater Upper Marlboro's 12th-clearest and 8th-windiest month. For the whole year in context, see Greater Upper Marlboro's year-round climate.

Daytime high
74°
5th warmest
Overnight low
58°
8th coldest
Rainfall
3.7 in
10.7 wet days
Daylight
14 h 06 min
5:00 AM – 7:07 PM
Cloud cover
62%
12th clearest
Wind
7 mph
8th windiest
Solar energy
5.77 kWh/m²
Travel score
6.6
out of 10

Greater Upper Marlboro is census designated place in Maryland until 2010.

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 70°F in the first days to 78°F by the end.

A typical May day in Greater Upper Marlboro reaches about 74°F in the afternoon and slips back to 58°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 86°F. Set against its neighbours, May runs about 8°F warmer than April and about 9°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17053
27054
37154
47154
57155
67155
77155
87255
97256
107256
117356
127356
137357
147357
157357
167458
177458
187458
197559
207559
217559
227660
237660
247660
257761
267761
277862
287862
297862
307863
317963

How May really feels in Greater Upper Marlboro

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.

Greater Upper Marlboro weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan44° / 30°3.18.62.69.60.7
Feb46° / 31°2.98.62.410.51.4
Mar55° / 38°4.010.31.511.73.4
Apr66° / 49°3.4100.1135.9
May74° / 58°3.710.7014.16.6
Jun83° / 67°3.711014.75.7
Jul87° / 72°4.312.3014.44.5
Aug85° / 71°4.010.6013.55.3
Sep78° / 64°4.39.1012.36.9
Oct67° / 52°3.57.90116.6
Nov56° / 42°2.97.60.19.94.2
Dec47° / 35°3.58.81.29.31.7

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 18% of May, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24654
34654
44555
54555
64654
74654
84654
94753
104654
114555
124555
134555
144654
154654
164654
174555
184555
194456
204456
214357
224357
234357
244357
254456
264456
274456
284555
294456
304555
314555

Chance of precipitation in May

Any precipitation

Greater Upper Marlboro gets around 3.7 in of rain over 10.7 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 35% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
233
333
433
533
633
733
834
934
1034
1135
1235
1335
1436
1536
1636
1736
1836
1936
2036
2136
2236
2336
2435
2535
2635
2734
2834
2934
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 52% of days. Sticky, muggy-or-worse air turns up on roughly 12% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
172161020
271161120
369171220
468181220
566181330
664191430
763191440
863191440
961191550
1061191550
1160191560
1258191670
1357191680
1457191680
1556191690
16551916100
17531917110
18511917121
19501918131
20481918131
21462019141
22442019152
23422020162
24402020172
25382020183
26372121193
27352121203
28332121213
29312222224
30302222224
31292222234

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
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 5:16 AM to 4:50 AM, and sunset from 6:52 PM to 7:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:166:52
213.65:156:53
313.75:146:54
413.75:126:55
513.75:116:56
613.85:106:57
713.85:096:58
813.95:086:59
913.95:077:00
1013.95:067:01
1114.05:057:02
1214.05:047:03
1314.05:037:04
1414.05:027:05
1514.15:017:06
1614.15:007:07
1714.14:597:07
1814.24:587:08
1914.24:577:09
2014.24:577:10
2114.34:567:11
2214.34:557:12
2314.34:547:13
2414.34:547:14
2514.44:537:14
2614.44:527:15
2714.44:527:16
2814.44:517:17
2914.44:517:18
3014.54:507:18
3114.54:507:19

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.77 kWh/m².

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 6.16 kWh/m² in June across the year — May's 5.77 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
306.0Bright
316.0Bright
Planning a trip in May

Hazard calendar for Greater Upper Marlboro

In seasonPeak

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

Greater Upper Marlboro 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 Greater Upper Marlboro?

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
5.2
Beach & pool
5th-best month of the year

May is a reasonable time to visit Greater Upper Marlboro for sightseeing.

What to pack for Greater Upper Marlboro in May

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

In May, Greater Upper Marlboro sees daytime highs around 74°F and nights near 58°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Greater Upper Marlboro in May

The nearest coast averages about 58°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 21 mi away) is warmest in August at about 78°F and coldest in February near 37°F.

It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb37Bracing
Mar40Bracing
Apr47Bracing
May58Bracing
Jun68Refreshing
Jul76Warm
Aug78Warm
Sep74Refreshing
Oct65Cool
Nov54Bracing
Dec45Bracing

UV index in Greater Upper Marlboro in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Greater Upper Marlboro peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 9Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Greater Upper Marlboro 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 Greater Upper Marlboro 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 1216 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct9Good
Nov8Good
Dec10Good
Location & terrain

Where is Greater Upper Marlboro?

Greater Upper Marlboro sits at 38.8°N, 76.7°W, 79 ft above sea level, in United States. The nearest listed city is Bowie, 7.5 mi away.

Topography around Greater Upper Marlboro

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

Within 2 miles, the terrain around Greater Upper Marlboro has only modest variations in elevation — a maximum elevation change of 276 ft around an average of 115 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 341 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,434 ft.

The land around Greater Upper Marlboro is covered by trees (75%) within 2 miles, trees (68%) within 10 miles, and trees (55%) and water (21%) within 50 miles.

2 miles
276 ft
10 miles
341 ft
50 miles
1,434 ft
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Bowie 7.5 mi · Camp Springs 8.7 mi · Clinton 9.3 mi · Suitland 9.3 mi · Suitland-Silver Hill 9.3 mi · Landover 11 mi · Lanham-Seabrook 11 mi · Seabrook 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 Greater Upper Marlboro (38.8314°, -76.7483°, elevation 79 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). 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).