Port Harcourt weather in September

In September, Port Harcourt sees average daytime highs of 28°C and overnight lows near 23°C, with 324 mm of rain across 29.7 wet days and about 12 hours of daylight. It is the 10th-warmest and 2nd-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 0% 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 Port Harcourt's 12th-clearest and 6th-windiest month. For the whole year in context, see Port Harcourt's year-round climate.

Daytime high
28°
10th warmest
Overnight low
23°
3rd coldest
Rainfall
324 mm
29.7 wet days
Daylight
12 hours
6:25 AM – 6:27 PM
Cloud cover
91%
12th clearest
Wind
7 km/h
6th windiest
Solar energy
3.68 kWh/m²
Travel score
2.9
out of 10

Port Harcourt is capital of Rivers State, Nigeria.

Density
5,889/km²
people per km²
Founded
1912

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

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

A typical September day in Port Harcourt reaches about 28°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12823
22823
32823
42823
52823
62823
72823
82823
92823
102823
112823
122823
132823
142823
152823
162823
172823
182823
192823
202823
212923
222923
232923
242923
252923
262923
272923
282923
292923
302923

How September really feels in Port Harcourt

Once humidity and wind are folded in, September averages 5 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
5
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Port Harcourt weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 24°4913.211.83.7
Feb32° / 24°7917.911.83.0
Mar31° / 25°17727.2122.5
Apr31° / 25°23127.612.12.5
May30° / 24°28129.512.22.6
Jun29° / 24°34129.112.32.9
Jul28° / 23°32429.112.23.3
Aug28° / 23°26528.512.23.5
Sep28° / 23°32429.7122.9
Oct29° / 23°31530.811.92.7
Nov30° / 24°17726.611.82.9
Dec31° / 24°5415.511.73.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 1% of September, with mostly cloudy or overcast conditions the remaining 99%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1199
2199
3199
4199
5199
6199
7199
8199
9199
10199
11199
12199
13199
14199
15199
16199
17199
18199
19199
20199
21199
22199
23199
24199
25199
26199
27199
28199
29199
30298

Chance of precipitation in September

Any precipitation

Port Harcourt gets around 324 mm of rain over 29.7 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 99% and peaks near 100% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
298
398
498
598
698
798
899
999
1099
1199
1299
1399
1499
1599
1699
1799
1899
1999
2099
2199
2299
2399
2499
2599
2699
27100
28100
29100
30100

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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 92% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1982
2982
3973
4973
5973
6964
7964
8964
9955
10955
11955
12946
13946
14946
15937
16937
17928
18928
19919
20919
219010
228911
238911
248812
258713
268614
278515
288416
298317
308218

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

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 6:29 AM to 6:22 AM, and sunset from 6:34 PM to 6:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:296:34
212.16:296:34
312.16:286:33
412.16:286:33
512.16:286:33
612.16:286:32
712.16:286:32
812.16:276:31
912.16:276:31
1012.16:276:30
1112.06:276:30
1212.06:266:29
1312.06:266:29
1412.06:266:28
1512.06:266:28
1612.06:256:27
1712.06:256:27
1812.06:256:26
1912.06:256:26
2012.06:256:25
2112.06:246:25
2212.06:246:24
2312.06:246:24
2412.06:246:23
2512.06:236:23
2612.06:236:22
2712.06:236:22
2812.06:236:21
2912.06:236:21
3012.06:226:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.68 kWh/m².

For context, solar energy here swings from a low near 3.35 kWh/m² to a high of 5.21 kWh/m² in January across the year — September's 3.68 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.7Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.7Moderate
213.7Moderate
223.8Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Port Harcourt

In seasonPeak

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

Port Harcourt sees seasonal dust haze (January–April), heaviest in February.

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

Is September a good time to visit Port Harcourt?

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

2.9
Sightseeing
6th-best month of the year
3.5
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Port Harcourt.

What to pack for Port Harcourt in September

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

In September, Port Harcourt sees daytime highs around 28°C and nights near 23°C. Pack light clothes and rain gear. About 30 days see rain.

light clothesrain gear

Sea temperature near Port Harcourt in September

The nearest coast averages about 27°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 46 km away) is warmest in March 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
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun28Warm
Jul27Warm
Aug26Warm
Sep27Warm
Oct27Warm
Nov28Tropical
Dec28Tropical

UV index in Port Harcourt in September

LowModerateHighVery highExtreme

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 Port Harcourt peaks around April 9 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highApr 9UV 13Jan 1UV 8
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar13Extreme
Apr13Extreme
May11Extreme
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec8Very high

Air quality in Port Harcourt in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Port Harcourt is worst in January — around 95 µg/m³ PM2.5 (unhealthy), about 3.7× the cleanest month (August, 25 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyJan 1893 µg/m³Aug 2026 µg/m³
PM2.5 (µg/m³)Level
Jan95Unhealthy
Feb84Unhealthy
Mar53Poor
Apr45Poor
May34Moderate
Jun32Moderate
Jul29Moderate
Aug25Moderate
Sep27Moderate
Oct33Moderate
Nov40Poor
Dec79Unhealthy
Location & terrain

Where is Port Harcourt?

Port Harcourt sits at 4.8°N, 7.0°E, 16 m above sea level, in Nigeria. The nearest listed city is Okrika, 9.0 km away.

Owerri

Topography around Port Harcourt

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

Within 3 km, the terrain around Port Harcourt has only modest variations in elevation — a maximum elevation change of 18 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 38 m; within 80 km, only modest variations in elevation — a maximum elevation change of 131 m.

The land around Port Harcourt is covered by artificial surfaces (57%) and mangroves (21%) within 3 km, mangroves (35%) and artificial surfaces (29%) within 16 km, and trees (49%) and water (22%) within 80 km.

3 km
18 m
16 km
38 m
80 km
131 m
treesgrasslandartificial surfacesbare terrainwatermangroves
September weather nearby: Okrika 9.0 km · Buguma 17 km · Obonoma 26 km · Degema Hulk 29 km · Bonny 40 km · Elele 42 km · Aba 54 km · Owerri 79 km

Nigeria travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 13% of US
price level, 2025
GDP per capita
$1,224
2025
Happiness
4.8 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
15.7
per 100k, 2023
Road deaths
20.7
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
High
EF EPI 569
Religion
Muslim 54%other Christian 35%Roman Catholic 11%other 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 Port Harcourt (4.7774°, 7.0134°, elevation 16 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).