Koulamoutou weather in September

In September, Koulamoutou sees average daytime highs of 29°C and overnight lows near 22°C, with 91 mm of rain across 20.1 wet days and about 12 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels muggy.

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 Koulamoutou's 4th-clearest and 3rd-windiest month. For the whole year in context, see Koulamoutou's year-round climate.

Daytime high
29°
8th warmest
Overnight low
22°
8th coldest
Rainfall
91 mm
20.1 wet days
Daylight
12 hours
6:05 AM – 6:04 PM
Cloud cover
76%
4th clearest
Wind
5 km/h
3rd windiest
Solar energy
4.51 kWh/m²
Travel score
3.9
out of 10

Koulamoutou is town 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 29°C through the month.

A typical September day in Koulamoutou reaches about 29°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12921
22921
32921
42921
52921
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
192922
203022
213022
223022
233022
243022
253022
263022
273022
283022
293022
303022

How September really feels in Koulamoutou

Once humidity and wind are folded in, September averages 4 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
4
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.

Koulamoutou weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°13221.812.13.4
Feb31° / 22°14220.5123.1
Mar31° / 22°15923.8122.9
Apr31° / 22°14123.9123.0
May30° / 22°12022.811.93.5
Jun28° / 21°4412.411.95.4
Jul28° / 21°288.111.96.4
Aug28° / 21°3810.3125.6
Sep29° / 22°9120.1123.9
Oct29° / 22°18627.1123.2
Nov29° / 21°18026.412.13.1
Dec30° / 22°1642512.13.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11585
21585
31684
41684
51783
61783
71783
81783
91882
101882
111882
121981
131981
141981
151981
161981
172080
182080
192080
202080
212080
222080
232080
242080
252179
262179
272179
282179
292179
302179

Chance of precipitation in September

Any precipitation

Koulamoutou gets around 91 mm of rain over 20.1 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 67% and peaks near 81% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
146
247
349
450
552
654
755
857
959
1061
1162
1264
1366
1468
1570
1671
1772
1874
1975
2075
2176
2277
2378
2479
2579
2680
2780
2881
2981
3081

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 71% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
12908
21918
31909
418910
518811
618811
718712
818514
908515
1008317
1108218
1208020
1307822
1407525
1507327
1607129
1706832
1806634
1906436
2006238
2106139
2205941
2305743
2405644
2505446
2605347
2705149
2805050
2904852
3004753

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:11 AM to 5:59 AM, and sunset from 6:09 PM to 6:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:116:09
212.06:106:09
312.06:106:09
412.06:096:08
512.06:096:08
612.06:096:08
712.06:086:07
812.06:086:07
912.06:076:07
1012.06:076:06
1112.06:076:06
1212.06:066:06
1312.06:066:05
1412.06:056:05
1512.06:056:05
1612.06:056:04
1712.06:046:04
1812.06:046:04
1912.06:036:03
2012.06:036:03
2112.06:036:03
2212.06:026:02
2312.06:026:02
2412.06:016:02
2512.06:016:01
2612.06:016:01
2712.06:006:01
2812.06:006:00
2912.06:006:00
3012.05:596:00

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.51 kWh/m².

For context, solar energy here swings from a low near 4.32 kWh/m² to a high of 5.36 kWh/m² in March across the year — September's 4.51 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Koulamoutou?

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

3.9
Sightseeing
4th-best month of the year
5.1
Beach & pool
4th-best month of the year

September is a weaker month for outdoor sightseeing in Koulamoutou.

What to pack for Koulamoutou in September

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

In September, Koulamoutou sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

UV index in Koulamoutou 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 Koulamoutou peaks around March 17 at about 15 (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 17UV 15Jun 19UV 8
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar15Extreme
Apr13Extreme
May11Extreme
Jun8Very high
Jul9Very high
Aug10Very high
Sep12Extreme
Oct14Extreme
Nov12Extreme
Dec9Very high

Air quality in Koulamoutou 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 Koulamoutou is worst in July — around 25 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (October, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJul 925 µg/m³Oct 209 µg/m³
PM2.5 (µg/m³)Level
Jan21Moderate
Feb25Moderate
Mar15Moderate
Apr13Moderate
May17Moderate
Jun25Moderate
Jul25Moderate
Aug22Moderate
Sep14Moderate
Oct9Good
Nov11Good
Dec18Moderate
Location & terrain

Where is Koulamoutou?

Koulamoutou sits at 1.1°S, 12.5°E, 282 m above sea level, in Gabon. The nearest listed city is Moanda, 95 km away.

MoandaFrancevilleMouilaMakokouMossendjoOyamLambarénéTchibanga

Topography around Koulamoutou

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

Within 3 km, the terrain around Koulamoutou has only modest variations in elevation — a maximum elevation change of 109 m around an average of 296 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 421 m; within 80 km, large variations in elevation — a maximum elevation change of 813 m.

The land around Koulamoutou is covered by trees (88%) within 3 km, trees (99%) within 16 km, and trees (100%) within 80 km.

3 km
109 m
16 km
421 m
80 km
813 m
treesgrasslandartificial surfacesbare terrain
September weather nearby: Moanda 95 km · Franceville 136 km · Mouila 176 km · Makokou 195 km · Mossendjo 203 km · Oyam 224 km · Lambaréné 252 km · Tchibanga 259 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 Koulamoutou (-1.1367°, 12.464°, elevation 282 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. 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).