Mossendjo weather in September

In September, Mossendjo sees average daytime highs of 28°C and overnight lows near 21°C, with 40 mm of rain across 10.5 wet days and about 12 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 28°C by the end. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Mossendjo's 8th-clearest and 2nd-windiest month. For the whole year in context, see Mossendjo's year-round climate.

Daytime high
28°
9th warmest
Overnight low
21°
4th coldest
Rainfall
40 mm
10.5 wet days
Daylight
12 hours
6:04 AM – 6:03 PM
Cloud cover
85%
8th clearest
Wind
7 km/h
2nd windiest
Solar energy
3.59 kWh/m²
Travel score
5.7
out of 10

Mossendjo is village in Republic of the Congo.

Density
3,821/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 27°C in the first days to 28°C by the end.

A typical September day in Mossendjo reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs about 2°C warmer than August and about 2°C cooler than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12720
22720
32720
42720
52720
62720
72720
82720
92720
102720
112720
122720
132720
142821
152821
162821
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282821
292921
302921

How September really feels in Mossendjo

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.

Mossendjo 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° / 22°24927.712.23.0
Feb30° / 22°2012412.12.9
Mar30° / 22°19126123.0
Apr30° / 22°21225.611.93.0
May29° / 22°13721.711.93.7
Jun27° / 20°163.911.86.9
Jul26° / 19°61.511.87.4
Aug26° / 19°112.611.97.1
Sep28° / 21°4010.5125.7
Oct29° / 21°21026.612.13.2
Nov29° / 21°30928.512.12.9
Dec29° / 21°30429.312.22.9

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 3% of September, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1298
2298
3298
4298
5298
6298
7298
8298
9298
10298
11397
12397
13397
14397
15397
16397
17397
18397
19496
20496
21496
22496
23496
24496
25496
26496
27496
28496
29595
30595

Chance of precipitation in September

Any precipitation

Mossendjo gets around 40 mm of rain over 10.5 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 36% and peaks near 61% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
115
216
316
417
518
619
721
822
924
1025
1127
1228
1330
1432
1533
1635
1737
1839
1941
2043
2145
2247
2349
2451
2553
2654
2756
2858
2960
3061

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 89% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
114860
213870
312880
411890
510900
69910
78920
87930
96940
106940
115941
125941
135941
144951
154942
164933
173943
183934
193925
202926
212908
222899
2328711
2418613
2518514
2618316
2718019
2817821
2917623
3007525

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 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
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min 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 6 minutes over September. Sunrise moves from 6:11 AM to 5:58 AM, and sunset from 6:07 PM to 5:59 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:116:07
211.96:106:07
311.96:106:07
412.06:096:06
512.06:096:06
612.06:086:06
712.06:086:06
812.06:086:05
912.06:076:05
1012.06:076:05
1112.06:066:04
1212.06:066:04
1312.06:056:04
1412.06:056:04
1512.06:046:03
1612.06:046:03
1712.06:046:03
1812.06:036:02
1912.06:036:02
2012.06:026:02
2112.06:026:02
2212.06:016:01
2312.06:016:01
2412.06:006:01
2512.06:006:00
2612.06:006:00
2712.05:596:00
2812.05:596:00
2912.05:585:59
3012.05:585:59

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.59 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 4.96 kWh/m² in March across the year — September's 3.59 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.4Moderate
23.5Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.6Moderate
143.6Moderate
153.6Moderate
163.6Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.7Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.7Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Mossendjo

In seasonPeak

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

Mossendjo'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 Mossendjo?

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

5.7
Sightseeing
4th-best month of the year
6.1
Beach & pool
4th-best month of the year

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

What to pack for Mossendjo in September

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

In September, Mossendjo sees daytime highs around 28°C and nights near 21°C. Pack light clothes. Worth having: rain gear. About 11 days see rain.

light clothesrain gear

UV index in Mossendjo 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 Mossendjo peaks around March 16 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highExtremeMar 16UV 15Jun 18UV 7
UV index (midday)Level
Jan13Extreme
Feb13Extreme
Mar15Extreme
Apr13Extreme
May10Very high
Jun7High
Jul9Very high
Aug9Very high
Sep12Extreme
Oct14Extreme
Nov11Extreme
Dec10Extreme

Air quality in Mossendjo 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 Mossendjo is worst in July — around 28 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 10 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJul 1128 µg/m³Nov 1210 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar14Moderate
Apr12Moderate
May19Moderate
Jun28Moderate
Jul28Moderate
Aug25Moderate
Sep18Moderate
Oct11Good
Nov10Good
Dec14Moderate
Location & terrain

Where is Mossendjo?

Mossendjo sits at 2.9°S, 12.7°E, 448 m above sea level, in Republic of the Congo. The nearest listed city is Sibiti, 108 km away.

SibitiLoudimaDolisieNkayiKayesMoandaFrancevilleMouyondzi

Topography around Mossendjo

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

Within 3 km, the terrain around Mossendjo has only modest variations in elevation — a maximum elevation change of 133 m around an average of 448 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 338 m; within 80 km, large variations in elevation — a maximum elevation change of 751 m.

The land around Mossendjo is covered by trees (65%) and grassland (29%) within 3 km, trees (93%) within 16 km, and trees (88%) within 80 km.

3 km
133 m
16 km
338 m
80 km
751 m
treesgrasslandartificial surfaces
September weather nearby: Sibiti 108 km · Loudima 136 km · Dolisie 139 km · Nkayi 152 km · Kayes 154 km · Moanda 163 km · Franceville 176 km · Mouyondzi 179 km

Republic of the Congo travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 35% of US
price level, 2025
GDP per capita
$2,515
2025
Happiness
4.5 / 10
World Happiness, 2025
Safe drinking water
46%
of population, 2021
Road deaths
29.7
per 100k/yr, 2019
Income group
Lower middle
World Bank
Religion
Roman Catholic 33%Awakening Churches/Christian Revival 22%Protestant 20%none 11%

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 Mossendjo (-2.9497°, 12.7042°, elevation 448 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).