Harper weather in May

In May, Harper sees average daytime highs of 28°C and overnight lows near 25°C, with 291 mm of rain across 29.3 wet days and about 12.2 hours of daylight. It is the 6th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 2% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of May to 12 h 12 min by month's end. Set against the rest of the year, May is Harper's 11th-clearest and 10th-windiest month. For the whole year in context, see Harper's year-round climate.

Daytime high
28°
6th warmest
Overnight low
25°
9th coldest
Rainfall
291 mm
29.3 wet days
Daylight
12 h 12 min
6:21 AM – 6:33 PM
Cloud cover
84%
11th clearest
Wind
8 km/h
10th windiest
Solar energy
4.43 kWh/m²
Travel score
3.2
out of 10

Harper is town in Maryland, Liberia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical May day in Harper reaches about 28°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132825
142825
152825
162825
172825
182825
192825
202825
212825
222824
232824
242824
252824
262824
272824
282824
292824
302824
312824

How May really feels in Harper

Once humidity and wind are folded in, May averages 19 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
19
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Harper weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°9519.611.84.5
Feb29° / 25°10820.811.93.9
Mar29° / 25°14826123.4
Apr29° / 25°15626.212.13.3
May28° / 25°29129.312.23.2
Jun27° / 24°28225.712.23.9
Jul26° / 24°13419.812.24.8
Aug26° / 23°12320.612.14.7
Sep27° / 24°24027.3123.7
Oct27° / 24°19729.211.93.6
Nov28° / 24°13826.311.83.6
Dec28° / 24°11624.411.84.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 10% of May, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11882
21783
31684
41585
51585
61585
71585
81585
91585
101585
111585
121585
131585
141585
151486
161486
171387
181387
191288
201288
211189
221189
23991
24991
25892
26892
27892
28793
29793
30793
31793

Chance of precipitation in May

Any precipitation

Harper gets around 291 mm of rain over 29.3 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 94% and peaks near 95% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
192
292
392
493
593
694
794
894
994
1095
1195
1295
1395
1495
1595
1695
1795
1895
1995
2095
2195
2295
2395
2495
2595
2695
2795
2895
2995
3095
3195

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the oppressive band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13367
23466
33565
43763
53862
63961
74159
84258
94456
104654
114753
124951
135149
145347
155545
165743
175941
186139
196337
206535
216733
226931
237129
247327
257525
267723
277822
288020
298218
308416
318614

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 12 min at the start of May to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over May. Sunrise moves from 6:24 AM to 6:21 AM, and sunset from 6:33 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:246:33
212.26:236:33
312.26:236:33
412.26:236:33
512.26:236:33
612.26:226:33
712.26:226:33
812.26:226:33
912.26:226:33
1012.26:226:33
1112.26:226:33
1212.26:226:33
1312.26:216:33
1412.26:216:33
1512.26:216:33
1612.26:216:33
1712.26:216:33
1812.26:216:33
1912.26:216:33
2012.26:216:33
2112.26:216:34
2212.26:216:34
2312.26:216:34
2412.26:216:34
2512.26:216:34
2612.26:216:34
2712.26:216:34
2812.26:216:35
2912.26:216:35
3012.26:216:35
3112.26:216:35

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.43 kWh/m².

For context, solar energy here swings from a low near 3.82 kWh/m² to a high of 5.22 kWh/m² in March across the year — May's 4.43 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.6Bright
134.5Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.1Bright
284.0Bright
294.0Bright
304.0Moderate
314.0Moderate
Planning a trip in May

Hazard calendar for Harper

In seasonPeak

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

Harper sees seasonal dust haze (February), heaviest in February.

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

Is May a good time to visit Harper?

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

3.2
Sightseeing
12th-best month of the year
3.8
Beach & pool
11th-best month of the year

May is a weaker month for outdoor sightseeing in Harper.

What to pack for Harper in May

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

In May, Harper sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Harper in May

The nearest coast averages about 29°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in May at about 29°C and coldest in August near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Warm
Mar28Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Tropical
Dec28Tropical

UV index in Harper in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Harper peaks around April 14 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 15 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highApr 14UV 13Jul 15UV 9
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar13Extreme
Apr14Extreme
May12Extreme
Jun10Very high
Jul9Very high
Aug11Extreme
Sep12Extreme
Oct12Extreme
Nov10Extreme
Dec9Very high

Air quality in Harper 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 Harper is worst in January — around 41 µg/m³ PM2.5 (poor), about 6.0× the cleanest month (September, 7 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateGoodModerateJan 2040 µg/m³Sep 207 µg/m³
PM2.5 (µg/m³)Level
Jan41Poor
Feb37Poor
Mar26Moderate
Apr31Moderate
May13Moderate
Jun13Moderate
Jul13Moderate
Aug9Good
Sep7Good
Oct8Good
Nov12Good
Dec29Moderate
Location & terrain

Where is Harper?

Harper sits at 4.4°N, 7.7°W, 14 m above sea level, in Liberia. The nearest listed city is Pleebo City, 24 km away.

TabouPetit Grabo

Topography around Harper

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Harper.

Within 3 km, the terrain around Harper has only modest variations in elevation — a maximum elevation change of 39 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 80 m; within 80 km, significant variations in elevation — a maximum elevation change of 405 m.

The land around Harper is covered by water (46%) and grassland (22%) within 3 km, water (53%) and trees (30%) within 16 km, and trees (56%) and water (41%) within 80 km.

3 km
39 m
16 km
80 m
80 km
405 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
May weather nearby: Pleebo City 24 km · Tabou 40 km · Gnépasso 99 km · Petit Grabo 108 km · Watté 120 km · San-Pédro 126 km · Dagadji 129 km · Gagny 130 km

Liberia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 0% of US
price level, 2025
GDP per capita
$915
2025
Happiness
4.3 / 10
World Happiness, 2025
Homicide rate
3.1
per 100k, 2012
Road deaths
38.9
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Christian 85%Muslim 12%none 3%Traditional 1%

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 Harper (4.3782°, -7.7108°, elevation 14 m), 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. 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).