Port-Gentil weather in September

In September, Port-Gentil sees average daytime highs of 25°C and overnight lows near 24°C, with 34 mm of rain across 8.6 wet days and about 12 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 10% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Port-Gentil's 4th-clearest and 2nd-windiest month. For the whole year in context, see Port-Gentil's year-round climate.

Daytime high
25°
9th warmest
Overnight low
24°
4th coldest
Rainfall
34 mm
8.6 wet days
Daylight
12 hours
6:19 AM – 6:19 PM
Cloud cover
69%
4th clearest
Wind
19 km/h
2nd windiest
Solar energy
4.79 kWh/m²
Travel score
6.7
out of 10

Port-Gentil is city in Gabon.

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 25°C through the month.

A typical September day in Port-Gentil reaches about 25°C in the afternoon and slips back to 24°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 26°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12524
22524
32524
42524
52524
62524
72524
82524
92524
102524
112524
122524
132524
142524
152524
162524
172524
182524
192524
202524
212624
222624
232624
242624
252625
262625
272625
282625
292625
302625

How September really feels in Port-Gentil

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.

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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Port-Gentil weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 25°23027.4123.8
Feb28° / 26°16922.7123.9
Mar28° / 26°17624123.8
Apr28° / 26°16122124.1
May27° / 25°11017.3125.3
Jun25° / 24°183.8127.6
Jul24° / 23°82.2128.1
Aug24° / 23°72.2128.0
Sep25° / 24°348.6126.7
Oct26° / 25°14723.2124.5
Nov27° / 25°27528123.6
Dec27° / 25°26228.4123.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34159
44159
54159
64060
74060
83961
93763
103763
113664
123565
133466
143367
153268
163169
173070
182971
192971
202971
212773
222773
232773
242773
252674
262674
272773
282773
292773
302773

Chance of precipitation in September

Any precipitation

Port-Gentil gets around 34 mm of rain over 8.6 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 30% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
112
212
313
414
515
616
717
818
920
1021
1123
1225
1326
1428
1530
1631
1733
1834
1935
2036
2138
2239
2340
2441
2543
2644
2745
2847
2948
3050

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
12773
22476
32278
42179
51981
61783
71684
81486
91387
101288
111090
12991
13991
14892
15793
16694
17694
18595
19595
20595
21496
22496
23496
24397
25397
26397
27298
28298
29298
30298

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze

Sunrise & sunset in September

DaylightNight

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

Days grow by about 0 minutes over September. Sunrise moves from 6:25 AM to 6:14 AM, and sunset from 6:24 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:256:24
212.06:256:24
312.06:246:24
412.06:246:23
512.06:246:23
612.06:236:23
712.06:236:22
812.06:226:22
912.06:226:22
1012.06:226:21
1112.06:216:21
1212.06:216:20
1312.06:206:20
1412.06:206:20
1512.06:206:19
1612.06:196:19
1712.06:196:19
1812.06:196:18
1912.06:186:18
2012.06:186:18
2112.06:176:17
2212.06:176:17
2312.06:176:17
2412.06:166:16
2512.06:166:16
2612.06:156:16
2712.06:156:15
2812.06:156:15
2912.06:146:15
3012.06:146:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.79 kWh/m².

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 5.13 kWh/m² in March across the year — September's 4.79 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Port-Gentil

In seasonPeak

None of Port-Gentil'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-Gentil's rainy season runs October–April, when most of the year's rain falls.

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

Is September a good time to visit Port-Gentil?

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

6.7
Sightseeing
4th-best month of the year
6.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Port-Gentil for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Port-Gentil in September

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

In September, Port-Gentil sees daytime highs around 25°C and nights near 24°C. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Port-Gentil 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 at the nearest coast (about 15 km away) is warmest in March at about 29°C and coldest in July near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Warm
Jun26Warm
Jul25Warm
Aug25Warm
Sep26Warm
Oct27Warm
Nov27Warm
Dec28Warm

UV index in Port-Gentil 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-Gentil peaks around March 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 20UV 14Jun 19UV 8
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar14Extreme
Apr13Extreme
May11Extreme
Jun8Very high
Jul9Very high
Aug9Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec10Extreme

Air quality in Port-Gentil 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-Gentil is worst in February — around 25 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (October, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 1224 µg/m³Oct 178 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb25Moderate
Mar18Moderate
Apr14Moderate
May16Moderate
Jun21Moderate
Jul21Moderate
Aug18Moderate
Sep11Good
Oct8Good
Nov11Good
Dec17Moderate
Location & terrain

Where is Port-Gentil?

Port-Gentil sits at 0.7°S, 8.8°E, 4 m above sea level, in Gabon. The nearest listed city is Owendo, 138 km away.

OwendoLibrevilleAkandaLambarénéNtoumOyamMouila

Topography around Port-Gentil

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

Within 3 km, the terrain around Port-Gentil has only modest variations in elevation — a maximum elevation change of 9 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 41 m; within 80 km, only modest variations in elevation — a maximum elevation change of 236 m.

The land around Port-Gentil is covered by artificial surfaces (50%) and water (38%) within 3 km, water (77%) within 16 km, and water (60%) and trees (28%) within 80 km.

3 km
9 m
16 km
41 m
80 km
236 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Owendo 138 km · Libreville 144 km · Akanda 160 km · Lambaréné 162 km · Ntoum 165 km · Oyam 219 km · São Tomé 257 km · Mouila 283 km

Gabon travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 37% of US
price level, 2025
GDP per capita
$8,263
2025
Happiness
5.2 / 10
World Happiness, 2025
Road deaths
23.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Protestant 46%Roman Catholic 30%Muslim 11%none 7%

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-Gentil (-0.7193°, 8.7815°, elevation 4 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).