Owendo weather in September

In September, Owendo sees average daytime highs of 28°C and overnight lows near 24°C, with 123 mm of rain across 20.2 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 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 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Owendo's 7th-clearest and 3rd-windiest month. For the whole year in context, see Owendo's year-round climate.

Daytime high
28°
9th warmest
Overnight low
24°
4th coldest
Rainfall
123 mm
20.2 wet days
Daylight
12 hours
6:16 AM – 6:16 PM
Cloud cover
83%
7th clearest
Wind
11 km/h
3rd windiest
Solar energy
4.3 kWh/m²
Travel score
4.2
out of 10

Owendo is place in Estuaire Province, 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 28°C through the month.

A typical September day in Owendo reaches about 28°C in the afternoon and slips back to 24°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 29°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)
12823
22823
32823
42823
52823
62823
72823
82823
92823
102824
112824
122824
132824
142824
152824
162824
172824
182824
192824
202824
212824
222824
232824
242824
252824
262824
272824
282824
292824
302824

How September really feels in Owendo

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.

Owendo 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
Jan29° / 24°24729.1122.9
Feb30° / 24°21625.7122.8
Mar30° / 25°26728.8122.7
Apr30° / 25°25527.3122.7
May30° / 24°22426.2123.2
Jun28° / 23°6611125.6
Jul27° / 23°265.6126.6
Aug28° / 23°276.7126.4
Sep28° / 24°12320.2124.2
Oct29° / 24°33530.2123.0
Nov29° / 24°38229.7122.8
Dec29° / 24°31130.2122.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1793
2793
3793
4793
5793
6793
7793
8793
9793
10793
11793
12793
13793
14694
15694
16694
17694
18595
19595
20595
21595
22595
23595
24595
25595
26595
27595
28595
29595
30595

Chance of precipitation in September

Any precipitation

Owendo gets around 123 mm of rain over 20.2 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 68% and peaks near 89% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
140
241
343
445
547
649
752
854
956
1059
1161
1263
1366
1468
1570
1672
1774
1875
1977
2078
2180
2281
2382
2483
2584
2685
2786
2887
2988
3089

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
117830
216840
314860
412880
511890
610900
78920
87930
96940
105950
114960
124960
133970
143970
152980
162980
172980
181981
191981
201981
211981
221981
231981
241972
251972
261972
270982
280973
290973
300973

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:11 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
512.06:206:20
612.06:206:20
712.06:196:20
812.06:196:19
912.06:196:19
1012.06:186:19
1112.06:186:18
1212.06:186:18
1312.06:176:17
1412.06:176:17
1512.06:176:17
1612.06:166:16
1712.06:166:16
1812.06:166:16
1912.06:156:15
2012.06:156:15
2112.06:146:14
2212.06:146:14
2312.06:146:14
2412.06:136:13
2512.06:136:13
2612.06:136:13
2712.06:126:12
2812.06:126:12
2912.06:126:12
3012.06:116:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m².

For context, solar energy here swings from a low near 4.01 kWh/m² to a high of 4.95 kWh/m² in March across the year — September's 4.3 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 Owendo

In seasonPeak

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

Owendo'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 Owendo?

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

4.2
Sightseeing
4th-best month of the year
4.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Owendo for sightseeing.

What to pack for Owendo in September

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

In September, Owendo sees daytime highs around 28°C and nights near 24°C. Pack light clothes and rain gear. About 20 days see rain.

light clothesrain gear

Sea temperature near Owendo 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 17 km away) 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 Owendo 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 Owendo 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 Owendo 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 Owendo is worst in February — around 47 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (September, 22 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateFeb 1346 µg/m³Sep 2222 µg/m³
PM2.5 (µg/m³)Level
Jan41Poor
Feb47Poor
Mar38Poor
Apr34Moderate
May33Moderate
Jun35Moderate
Jul33Moderate
Aug28Moderate
Sep22Moderate
Oct23Moderate
Nov28Moderate
Dec37Poor
Location & terrain

Where is Owendo?

Owendo sits at 0.3°N, 9.5°E, 6 m above sea level, in Gabon. The nearest listed city is Libreville, 13 km away.

AkandaLambarénéPort-GentilOyamBataCiudad de la Paz

Topography around Owendo

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

Within 3 km, the terrain around Owendo has only modest variations in elevation — a maximum elevation change of 64 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 112 m; within 80 km, large variations in elevation — a maximum elevation change of 709 m.

The land around Owendo is covered by water (67%) within 3 km, water (57%) and trees (20%) within 16 km, and trees (54%) and water (38%) within 80 km.

3 km
64 m
16 km
112 m
80 km
709 m
treesgrasslandartificial surfacesbare terrainwatermangroves
September weather nearby: Libreville 13 km · Ntoum 31 km · Akanda 40 km · Lambaréné 137 km · Port-Gentil 138 km · Oyam 142 km · Bata 177 km · Ciudad de la Paz 206 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 Owendo (0.2912°, 9.5046°, elevation 6 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).