Harper weather in September
In September, Harper sees average daytime highs of 27°C and overnight lows near 24°C, with 240 mm of rain across 27.3 wet days and about 12 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 1% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Harper's 8th-clearest and 3rd-windiest month. For the whole year in context, see Harper's year-round climate.
- Daytime high
- 27°
- 10th warmest
- Overnight low
- 24°
- 3rd coldest
- Rainfall
- 240 mm
- 27.3 wet days
- Daylight
- 12 hours
- 6:24 AM – 6:26 PM
- Cloud cover
- 80%
- 8th clearest
- Wind
- 12 km/h
- 3rd windiest
- Solar energy
- 4.17 kWh/m²
- Travel score
- 3.7
- out of 10
Harper is town in Maryland, Liberia.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 27°C through the month.
A typical September day in Harper reaches about 27°C in the afternoon and slips back to 24°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 28°C. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 24 |
| 2 | 26 | 24 |
| 3 | 26 | 24 |
| 4 | 26 | 24 |
| 5 | 26 | 24 |
| 6 | 27 | 24 |
| 7 | 27 | 24 |
| 8 | 27 | 24 |
| 9 | 27 | 24 |
| 10 | 27 | 24 |
| 11 | 27 | 24 |
| 12 | 27 | 24 |
| 13 | 27 | 24 |
| 14 | 27 | 24 |
| 15 | 27 | 24 |
| 16 | 27 | 24 |
| 17 | 27 | 24 |
| 18 | 27 | 24 |
| 19 | 27 | 24 |
| 20 | 27 | 24 |
| 21 | 27 | 24 |
| 22 | 27 | 24 |
| 23 | 27 | 24 |
| 24 | 27 | 24 |
| 25 | 27 | 24 |
| 26 | 27 | 24 |
| 27 | 27 | 24 |
| 28 | 27 | 24 |
| 29 | 27 | 24 |
| 30 | 27 | 24 |
How September really feels in Harper
Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Harper weather by month
How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 24° | 95 | 19.6 | 11.8 | 4.5 |
| Feb | 29° / 25° | 108 | 20.8 | 11.9 | 3.9 |
| Mar | 29° / 25° | 148 | 26 | 12 | 3.4 |
| Apr | 29° / 25° | 156 | 26.2 | 12.1 | 3.3 |
| May | 28° / 25° | 291 | 29.3 | 12.2 | 3.2 |
| Jun | 27° / 24° | 282 | 25.7 | 12.2 | 3.9 |
| Jul | 26° / 24° | 134 | 19.8 | 12.2 | 4.8 |
| Aug | 26° / 23° | 123 | 20.6 | 12.1 | 4.7 |
| Sep | 27° / 24° | 240 | 27.3 | 12 | 3.7 |
| Oct | 27° / 24° | 197 | 29.2 | 11.9 | 3.6 |
| Nov | 28° / 24° | 138 | 26.3 | 11.8 | 3.6 |
| Dec | 28° / 24° | 116 | 24.4 | 11.8 | 4.0 |
Cloud cover in September
The sky is clear or mostly clear about 1% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 88%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 8 | 8 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 13 | 14 | 14 | 15 | 16 | 16 | 17 | 18 | 18 |
| Cloudier (%) | 92 | 92 | 91 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 89 | 89 | 89 | 89 | 88 | 88 | 88 | 87 | 86 | 86 | 85 | 84 | 84 | 83 | 82 | 82 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 8 | 92 |
| 2 | 8 | 92 |
| 3 | 9 | 91 |
| 4 | 10 | 90 |
| 5 | 10 | 90 |
| 6 | 10 | 90 |
| 7 | 10 | 90 |
| 8 | 10 | 90 |
| 9 | 10 | 90 |
| 10 | 10 | 90 |
| 11 | 10 | 90 |
| 12 | 10 | 90 |
| 13 | 10 | 90 |
| 14 | 10 | 90 |
| 15 | 11 | 89 |
| 16 | 11 | 89 |
| 17 | 11 | 89 |
| 18 | 11 | 89 |
| 19 | 12 | 88 |
| 20 | 12 | 88 |
| 21 | 12 | 88 |
| 22 | 13 | 87 |
| 23 | 14 | 86 |
| 24 | 14 | 86 |
| 25 | 15 | 85 |
| 26 | 16 | 84 |
| 27 | 16 | 84 |
| 28 | 17 | 83 |
| 29 | 18 | 82 |
| 30 | 18 | 82 |
Chance of precipitation in September
Harper gets around 240 mm of rain over 27.3 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 91% and peaks near 94% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 84 | 85 | 86 | 87 | 87 | 88 | 88 | 89 | 89 | 90 | 90 | 91 | 91 | 91 | 92 | 92 | 92 | 92 | 93 | 93 | 93 | 93 | 93 | 93 | 94 | 94 | 94 | 94 | 94 | 94 |
| Rain chance (%) | |
|---|---|
| 1 | 84 |
| 2 | 85 |
| 3 | 86 |
| 4 | 87 |
| 5 | 87 |
| 6 | 88 |
| 7 | 88 |
| 8 | 89 |
| 9 | 89 |
| 10 | 90 |
| 11 | 90 |
| 12 | 91 |
| 13 | 91 |
| 14 | 91 |
| 15 | 92 |
| 16 | 92 |
| 17 | 92 |
| 18 | 92 |
| 19 | 93 |
| 20 | 93 |
| 21 | 93 |
| 22 | 93 |
| 23 | 93 |
| 24 | 93 |
| 25 | 94 |
| 26 | 94 |
| 27 | 94 |
| 28 | 94 |
| 29 | 94 |
| 30 | 94 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Oppressive (%) | 94 | 95 | 95 | 96 | 96 | 96 | 97 | 97 | 97 | 97 | 97 | 98 | 98 | 98 | 98 | 98 | 98 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 |
| Muggy (%) | Oppressive (%) | |
|---|---|---|
| 1 | 6 | 94 |
| 2 | 5 | 95 |
| 3 | 5 | 95 |
| 4 | 4 | 96 |
| 5 | 4 | 96 |
| 6 | 4 | 96 |
| 7 | 3 | 97 |
| 8 | 3 | 97 |
| 9 | 3 | 97 |
| 10 | 3 | 97 |
| 11 | 3 | 97 |
| 12 | 2 | 98 |
| 13 | 2 | 98 |
| 14 | 2 | 98 |
| 15 | 2 | 98 |
| 16 | 2 | 98 |
| 17 | 2 | 98 |
| 18 | 1 | 99 |
| 19 | 1 | 99 |
| 20 | 1 | 99 |
| 21 | 1 | 99 |
| 22 | 1 | 99 |
| 23 | 1 | 99 |
| 24 | 1 | 99 |
| 25 | 1 | 99 |
| 26 | 1 | 99 |
| 27 | 1 | 99 |
| 28 | 1 | 99 |
| 29 | 1 | 99 |
| 30 | 1 | 99 |
Wind in September
Winds average 12 km/h in September.
Across September, daily wind ranges from about 10 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 10 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 13 | light breeze |
| 2 | 13 | light breeze |
| 3 | 13 | light breeze |
| 4 | 13 | light breeze |
| 5 | 13 | light breeze |
| 6 | 13 | light breeze |
| 7 | 12 | light breeze |
| 8 | 12 | light breeze |
| 9 | 12 | light breeze |
| 10 | 12 | light breeze |
| 11 | 12 | light breeze |
| 12 | 12 | calm |
| 13 | 12 | calm |
| 14 | 12 | calm |
| 15 | 12 | calm |
| 16 | 12 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 10 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 6 minutes over September. Sunrise moves from 6:28 AM to 6:21 AM, and sunset from 6:33 PM to 6:19 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Sunrise (AM) | 6:28 | 6:28 | 6:28 | 6:27 | 6:27 | 6:27 | 6:27 | 6:26 | 6:26 | 6:26 | 6:26 | 6:25 | 6:25 | 6:25 | 6:25 | 6:24 | 6:24 | 6:24 | 6:24 | 6:23 | 6:23 | 6:23 | 6:23 | 6:23 | 6:22 | 6:22 | 6:22 | 6:22 | 6:21 | 6:21 |
| Sunset (PM) | 6:33 | 6:33 | 6:32 | 6:32 | 6:31 | 6:31 | 6:30 | 6:30 | 6:29 | 6:29 | 6:28 | 6:28 | 6:27 | 6:27 | 6:26 | 6:26 | 6:25 | 6:25 | 6:24 | 6:24 | 6:23 | 6:23 | 6:22 | 6:22 | 6:21 | 6:21 | 6:21 | 6:20 | 6:20 | 6:19 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.1 | 6:28 | 6:33 |
| 2 | 12.1 | 6:28 | 6:33 |
| 3 | 12.1 | 6:28 | 6:32 |
| 4 | 12.1 | 6:27 | 6:32 |
| 5 | 12.1 | 6:27 | 6:31 |
| 6 | 12.1 | 6:27 | 6:31 |
| 7 | 12.1 | 6:27 | 6:30 |
| 8 | 12.1 | 6:26 | 6:30 |
| 9 | 12.1 | 6:26 | 6:29 |
| 10 | 12.0 | 6:26 | 6:29 |
| 11 | 12.0 | 6:26 | 6:28 |
| 12 | 12.0 | 6:25 | 6:28 |
| 13 | 12.0 | 6:25 | 6:27 |
| 14 | 12.0 | 6:25 | 6:27 |
| 15 | 12.0 | 6:25 | 6:26 |
| 16 | 12.0 | 6:24 | 6:26 |
| 17 | 12.0 | 6:24 | 6:25 |
| 18 | 12.0 | 6:24 | 6:25 |
| 19 | 12.0 | 6:24 | 6:24 |
| 20 | 12.0 | 6:23 | 6:24 |
| 21 | 12.0 | 6:23 | 6:23 |
| 22 | 12.0 | 6:23 | 6:23 |
| 23 | 12.0 | 6:23 | 6:22 |
| 24 | 12.0 | 6:23 | 6:22 |
| 25 | 12.0 | 6:22 | 6:21 |
| 26 | 12.0 | 6:22 | 6:21 |
| 27 | 12.0 | 6:22 | 6:21 |
| 28 | 12.0 | 6:22 | 6:20 |
| 29 | 12.0 | 6:21 | 6:20 |
| 30 | 12.0 | 6:21 | 6:19 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.17 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 — September's 4.17 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.0 | Bright |
| 2 | 4.0 | Bright |
| 3 | 4.0 | Bright |
| 4 | 4.0 | Bright |
| 5 | 4.0 | Bright |
| 6 | 4.1 | Bright |
| 7 | 4.1 | Bright |
| 8 | 4.1 | Bright |
| 9 | 4.1 | Bright |
| 10 | 4.1 | Bright |
| 11 | 4.1 | Bright |
| 12 | 4.1 | Bright |
| 13 | 4.2 | Bright |
| 14 | 4.2 | Bright |
| 15 | 4.2 | Bright |
| 16 | 4.2 | Bright |
| 17 | 4.2 | Bright |
| 18 | 4.2 | Bright |
| 19 | 4.2 | Bright |
| 20 | 4.3 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.3 | Bright |
| 23 | 4.3 | Bright |
| 24 | 4.3 | Bright |
| 25 | 4.3 | Bright |
| 26 | 4.3 | Bright |
| 27 | 4.3 | Bright |
| 28 | 4.4 | Bright |
| 29 | 4.4 | Bright |
| 30 | 4.4 | Bright |
Hazard calendar for Harper
None of Harper's seasonal hazards are active in September. 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.
Is September a good time to visit Harper?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Harper.
What to pack for Harper in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Harper sees daytime highs around 27°C and nights near 24°C. Pack rain gear. Worth having: light clothes. About 27 days see rain.
Sea temperature near Harper in September
The nearest coast averages about 26°C in September — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 28 | 29 | 29 | 28 | 27 | 26 | 26 | 27 | 28 | 28 |
| Comfort | Tropical | Warm | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 28 | Warm |
| Mar | 28 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 28 | Warm |
| Jul | 27 | Warm |
| Aug | 26 | Warm |
| Sep | 26 | Warm |
| Oct | 27 | Warm |
| Nov | 28 | Tropical |
| Dec | 28 | Tropical |
UV index in Harper in September
Clear-sky midday UV in September 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 13 | 13 | 14 | 12 | 10 | 9 | 11 | 12 | 12 | 10 | 9 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 13 | Extreme |
| Mar | 13 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 10 | Very high |
| Jul | 9 | Very high |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Extreme |
| Dec | 9 | Very high |
Air quality in Harper in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 41 | 37 | 26 | 31 | 13 | 13 | 13 | 9 | 7 | 8 | 12 | 29 |
| Level | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 41 | Poor |
| Feb | 37 | Poor |
| Mar | 26 | Moderate |
| Apr | 31 | Moderate |
| May | 13 | Moderate |
| Jun | 13 | Moderate |
| Jul | 13 | Moderate |
| Aug | 9 | Good |
| Sep | 7 | Good |
| Oct | 8 | Good |
| Nov | 12 | Good |
| Dec | 29 | Moderate |
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.
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.
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
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).