Libreville weather in September

In September, Libreville sees average daytime highs of 27°C and overnight lows near 24°C, with 151 mm of rain across 21.4 wet days and about 12 hours of daylight. It is the 10th-warmest and 9th-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 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Libreville's 6th-clearest and 3rd-windiest month. For the whole year in context, see Libreville's year-round climate.

Daytime high
27°
10th warmest
Overnight low
24°
4th coldest
Rainfall
151 mm
21.4 wet days
Daylight
12 hours
6:16 AM – 6:17 PM
Cloud cover
80%
6th clearest
Wind
12 km/h
3rd windiest
Solar energy
4.28 kWh/m²
Travel score
4.5
out of 10

Libreville is capital city of Gabon.

Density
4,477/km²
people per km²
Founded
1849

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 27°C through the month.

A typical September day in Libreville 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.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12724
22724
32724
42724
52724
62724
72724
82724
92724
102724
112724
122724
132724
142724
152724
162724
172724
182724
192724
202724
212724
222724
232724
242724
252724
262724
272724
282724
292724
302724

How September really feels in Libreville

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.

Libreville weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°25029.1123.2
Feb29° / 25°21625.7123.1
Mar29° / 25°27028.8123.0
Apr29° / 25°26127.4123.0
May29° / 25°24426.6123.5
Jun27° / 24°8212.4125.8
Jul26° / 23°336.8126.7
Aug26° / 23°368.2126.5
Sep27° / 24°15121.4124.5
Oct28° / 24°35930.3123.4
Nov28° / 24°39329.6123.3
Dec28° / 24°31630.2123.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31585
41585
51585
61585
71585
81585
91585
101387
111387
121288
131288
141189
151189
161090
171090
18991
19991
20991
21793
22793
23793
24793
25793
26793
27793
28793
29793
30793

Chance of precipitation in September

Any precipitation

Libreville gets around 151 mm of rain over 21.4 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 71% and peaks near 91% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
143
245
347
449
551
653
756
858
960
1063
1165
1268
1370
1472
1574
1676
1778
1879
1981
2082
2183
2284
2385
2486
2587
2688
2789
2890
2991
3091

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 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
1991
2892
3793
4694
5595
6496
7496
8397
9298
10298
11199
12199
13199
14199
150100
160100
170100
180100
190100
200100
210100
220100
230100
240100
250100
260100
270100
280100
290100
300100

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 6:22 AM to 6:12 AM, and sunset from 6:22 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:226:22
212.06:216:22
312.06:216:21
412.06:216:21
512.06:206:21
612.06:206:20
712.06:206:20
812.06:196:20
912.06:196:19
1012.06:196:19
1112.06:186:18
1212.06:186:18
1312.06:186:18
1412.06:176:17
1512.06:176:17
1612.06:166:17
1712.06:166:16
1812.06:166:16
1912.06:156:15
2012.06:156:15
2112.06:156:15
2212.06:146:14
2312.06:146:14
2412.06:146:14
2512.06:136:13
2612.06:136:13
2712.06:136:12
2812.06:126:12
2912.06:126:12
3012.06:126:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.28 kWh/m².

For context, solar energy here swings from a low near 3.99 kWh/m² to a high of 4.98 kWh/m² in March across the year — September's 4.28 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Libreville

In seasonPeak

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

Libreville's rainy season runs October–May, 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 Libreville?

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

4.5
Sightseeing
4th-best month of the year
4.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit Libreville for sightseeing.

What to pack for Libreville in September

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

In September, Libreville sees daytime highs around 27°C and nights near 24°C. Pack light clothes and rain gear. About 21 days see rain.

light clothesrain gear

Sea temperature near Libreville 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 March at about 29°C and coldest in August 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
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug25Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in Libreville 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 Libreville peaks around March 20 at about 13 (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 highExtremeVery highMar 20UV 13Jun 19UV 8
UV index (midday)Level
Jan11Extreme
Feb11Extreme
Mar13Extreme
Apr12Extreme
May11Extreme
Jun8Very high
Jul9Very high
Aug9Very high
Sep12Extreme
Oct13Extreme
Nov11Extreme
Dec9Very high

Air quality in Libreville 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 Libreville is worst in February — around 46 µg/m³ PM2.5 (poor), about 2.3× the cleanest month (September, 21 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateFeb 1345 µg/m³Sep 2321 µg/m³
PM2.5 (µg/m³)Level
Jan41Poor
Feb46Poor
Mar36Poor
Apr31Moderate
May30Moderate
Jun32Moderate
Jul31Moderate
Aug26Moderate
Sep21Moderate
Oct21Moderate
Nov26Moderate
Dec36Poor
Location & terrain

Where is Libreville?

Libreville sits at 0.4°N, 9.5°E, 8 m above sea level, in Gabon. The nearest listed city is Owendo, 13 km away.

Port-GentilLambarénéOyamBataCiudad de la Paz

Topography around Libreville

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

Within 3 km, the terrain around Libreville has only modest variations in elevation — a maximum elevation change of 59 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 112 m; within 80 km, significant variations in elevation — a maximum elevation change of 560 m.

The land around Libreville is covered by artificial surfaces (60%) and water (28%) within 3 km, water (45%) and trees (23%) within 16 km, and trees (49%) and water (42%) within 80 km.

3 km
59 m
16 km
112 m
80 km
560 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Owendo 13 km · Akanda 28 km · Ntoum 34 km · Port-Gentil 144 km · Lambaréné 150 km · Oyam 152 km · Bata 167 km · Ciudad de la Paz 203 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 Libreville (0.3924°, 9.4536°, elevation 8 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).