Kérou weather in September

In September, Kérou sees average daytime highs of 30°C and overnight lows near 22°C, with 186 mm of rain across 22.2 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 29°C in the first days to 31°C by the end. The sky is clear or mostly clear about 14% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Kérou's 10th-clearest and 12th-windiest month. For the whole year in context, see Kérou's year-round climate.

Daytime high
30°
10th warmest
Overnight low
22°
7th coldest
Rainfall
186 mm
22.2 wet days
Daylight
12 h 06 min
6:44 AM – 6:48 PM
Cloud cover
69%
10th clearest
Wind
6 km/h
12th windiest
Solar energy
5.28 kWh/m²
Travel score
3.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 29°C in the first days to 31°C by the end.

A typical September day in Kérou reaches about 30°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 28°C and 32°C. Set against its neighbours, September runs about 1°C warmer than August and about 3°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12922
22922
33022
43022
53022
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193122
203122
213122
223122
233122
243122
253122
263122
273122
283122
293122
303122

How September really feels in Kérou

Once humidity and wind are folded in, September averages 30 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
30
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.

Kérou weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 19°10.111.44.8
Feb35° / 22°20.511.63.0
Mar38° / 24°91.911.91.5
Apr37° / 26°378.312.21.5
May35° / 25°901612.52.3
Jun32° / 23°11118.912.63.1
Jul30° / 23°19724.112.63.4
Aug29° / 22°27626.812.43.3
Sep30° / 22°18622.212.13.4
Oct33° / 22°5810.311.83.6
Nov35° / 20°10.411.53.5
Dec33° / 19°0011.44.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11882
21981
31981
42080
52179
62179
72278
82278
92476
102575
112674
122674
132773
142971
152971
163169
173268
183367
193664
203763
213961
224159
234258
244555
254654
264753
275050
285149
295248
305347

Chance of precipitation in September

Any precipitation

Kérou gets around 186 mm of rain over 22.2 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 73% and peaks near 84% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
184
284
383
483
582
681
781
880
980
1079
1178
1277
1376
1475
1574
1673
1773
1872
1971
2070
2169
2268
2367
2466
2565
2664
2763
2862
2961
3060

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 (%)Miserable (%)
101000
201000
301000
401000
50991
60991
70991
80991
90991
100991
110991
120991
130991
140982
150982
160982
170982
180982
190982
200982
210982
220982
230982
240982
250982
260982
271972
281972
291972
301972

Wind in September

Winds average 6 km/h in September, the calmest month.

Across September, daily wind ranges from about 6 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
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over September. Sunrise moves from 6:45 AM to 6:43 AM, and sunset from 6:58 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:456:58
212.26:456:57
312.26:456:56
412.26:456:56
512.26:456:55
612.26:456:54
712.26:456:54
812.16:456:53
912.16:456:52
1012.16:456:52
1112.16:446:51
1212.16:446:50
1312.16:446:50
1412.16:446:49
1512.16:446:48
1612.16:446:48
1712.06:446:47
1812.06:446:46
1912.06:446:46
2012.06:446:45
2112.06:446:44
2212.06:446:44
2312.06:446:43
2412.06:446:42
2512.06:446:42
2612.06:446:41
2711.96:446:40
2811.96:436:40
2911.96:436:39
3011.96:436:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.28 kWh/m².

For context, solar energy here swings from a low near 4.59 kWh/m² to a high of 6.59 kWh/m² in March across the year — September's 5.28 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.9Bright
54.9Bright
64.9Bright
75.0Bright
85.0Bright
95.0Bright
105.1Bright
115.1Bright
125.1Bright
135.2Bright
145.2Bright
155.2Bright
165.3Bright
175.3Bright
185.3Bright
195.4Bright
205.4Bright
215.5Bright
225.5Bright
235.5Bright
245.6Bright
255.6Bright
265.6Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Kérou

In seasonPeak

In September, Kérou sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Kérou's monsoon runs July–September, when most of the year's rain falls.

Kérou sees seasonal dust haze (January–June), heaviest in March.

Monsoon
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Kérou?

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

3.4
Sightseeing
5th-best month of the year
4.8
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Kérou.

What to pack for Kérou in September

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

In September, Kérou sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

UV index in Kérou 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 Kérou peaks around September 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highSep 13UV 12Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar10Very high
Apr12Extreme
May11Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct10Extreme
Nov9Very high
Dec8Very high

Air quality in Kérou 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 Kérou is worst in February — around 86 µg/m³ PM2.5 (unhealthy), about 6.4× the cleanest month (August, 14 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyFeb 1384 µg/m³Aug 1114 µg/m³
PM2.5 (µg/m³)Level
Jan72Unhealthy
Feb86Unhealthy
Mar62Unhealthy
Apr44Poor
May24Moderate
Jun19Moderate
Jul14Moderate
Aug14Moderate
Sep19Moderate
Oct33Moderate
Nov46Poor
Dec67Unhealthy
Location & terrain

Where is Kérou?

Kérou sits at 10.8°N, 2.1°E, 332 m above sea level, in Benin. The nearest listed city is Sinendé, 61 km away.

SinendéBanikoaraPéhonkoTobréToukountounaBembèrèkèTanguiétaKandi

Topography around Kérou

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

Within 3 km, the terrain around Kérou has only modest variations in elevation — a maximum elevation change of 46 m around an average of 330 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 106 m; within 80 km, significant variations in elevation — a maximum elevation change of 475 m.

The land around Kérou is covered by cropland (49%) and shrubs (23%) within 3 km, cropland (65%) within 16 km, and cropland (41%), shrubs (31%) and grassland (23%) within 80 km.

3 km
46 m
16 km
106 m
80 km
475 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Sinendé 61 km · Banikoara 64 km · Péhonko 67 km · Tobré 70 km · Toukountouna 88 km · Bembèrèkè 90 km · Tanguiéta 94 km · Kandi 97 km

Benin travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$1,658
2025
Happiness
4.4 / 10
World Happiness, 2025
Safe drinking water
18%
of population, 2024
Homicide rate
1.1
per 100k, 2017
Road deaths
26.8
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Very low
EF EPI 406
Religion
Muslim 28%Roman Catholic 26%Protestant 14%Vodoun 12%

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 Kérou (10.8258°, 2.1048°, elevation 332 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).