Grand-Bassam weather in September

In September, Grand-Bassam sees average daytime highs of 25°C and overnight lows near 24°C, with 88 mm of rain across 18.3 wet days and about 12 hours of daylight. It is the 11th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 11% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Grand-Bassam's 7th-clearest and 5th-windiest month. For the whole year in context, see Grand-Bassam's year-round climate.

Daytime high
25°
11th warmest
Overnight low
24°
2nd coldest
Rainfall
88 mm
18.3 wet days
Daylight
12 hours
6:08 AM – 6:10 PM
Cloud cover
70%
7th clearest
Wind
14 km/h
5th windiest
Solar energy
4.73 kWh/m²
Travel score
5.3
out of 10

Grand-Bassam is city of côte d'ivoire.

Density
762/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

Day-to-day highs hold fairly steady near 25°C through the month.

A typical September day in Grand-Bassam reaches about 25°C in the afternoon and slips back to 24°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 26°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12524
22524
32524
42524
52524
62524
72524
82524
92524
102524
112524
122524
132524
142524
152524
162524
172524
182524
192524
202524
212524
222524
232524
242624
252624
262624
272624
282624
292624
302624

How September really feels in Grand-Bassam

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.

Grand-Bassam weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 26°4713.711.76.0
Feb28° / 26°5516.311.85.2
Mar28° / 26°7820.2124.4
Apr28° / 26°10321.912.14.1
May28° / 26°20627.912.23.6
Jun27° / 25°25027.312.33.8
Jul25° / 24°12919.812.35.1
Aug25° / 24°6414.312.25.9
Sep25° / 24°8818.3125.3
Oct26° / 25°10724.311.94.5
Nov28° / 25°9324.211.84.3
Dec28° / 26°6318.911.75.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 66%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12971
22971
33070
43070
52971
63070
73070
83169
93169
103169
113268
123367
133367
143367
153466
163466
173466
183367
193466
203466
213466
223565
233664
243664
253664
263763
273763
283961
293961
303961

Chance of precipitation in September

Any precipitation

Grand-Bassam gets around 88 mm of rain over 18.3 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 61% and peaks near 70% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
153
254
354
455
555
655
756
856
956
1057
1157
1258
1359
1459
1560
1661
1761
1862
1963
2064
2164
2265
2366
2467
2567
2668
2769
2869
2970
3070

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

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
1199
20100
30100
40100
50100
60100
70100
8199
9199
10199
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 14 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:12 AM to 6:05 AM, and sunset from 6:18 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:126:18
212.16:116:17
312.16:116:17
412.16:116:16
512.16:116:16
612.16:116:15
712.16:106:15
812.16:106:14
912.16:106:14
1012.16:106:13
1112.16:106:13
1212.06:096:12
1312.06:096:12
1412.06:096:11
1512.06:096:11
1612.06:086:10
1712.06:086:10
1812.06:086:09
1912.06:086:09
2012.06:086:08
2112.06:076:08
2212.06:076:07
2312.06:076:07
2412.06:076:06
2512.06:066:06
2612.06:066:05
2712.06:066:05
2812.06:066:04
2912.06:066:04
3012.06:056:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.73 kWh/m².

For context, solar energy here swings from a low near 4.19 kWh/m² to a high of 5.52 kWh/m² in March across the year — September's 4.73 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.7Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Grand-Bassam

In seasonPeak

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

Grand-Bassam's rainy season runs May–July, when most of the year's rain falls.

Grand-Bassam sees seasonal dust haze (January–February), heaviest in February.

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

Is September a good time to visit Grand-Bassam?

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

5.3
Sightseeing
3rd-best month of the year
4.9
Beach & pool
6th-best month of the year

September is a reasonable time to visit Grand-Bassam for sightseeing.

What to pack for Grand-Bassam in September

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

In September, Grand-Bassam sees daytime highs around 25°C and nights near 24°C. Pack rain gear. Worth having: light clothes and sun protection. About 18 days see rain.

rain gearlight clothessun protection

Sea temperature near Grand-Bassam in September

The nearest coast averages about 24°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 16 km away) is warmest in April at about 28°C and coldest in August near 24°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Warm
Mar28Tropical
Apr28Tropical
May28Tropical
Jun27Warm
Jul25Warm
Aug24Refreshing
Sep24Warm
Oct26Warm
Nov28Tropical
Dec28Tropical

UV index in Grand-Bassam 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 Grand-Bassam peaks around April 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 16 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 highApr 12UV 13Jul 16UV 8
UV index (midday)Level
Jan10Very high
Feb12Extreme
Mar13Extreme
Apr14Extreme
May11Extreme
Jun10Extreme
Jul8Very high
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Grand-Bassam 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 Grand-Bassam is worst in January — around 72 µg/m³ PM2.5 (unhealthy), about 3.3× the cleanest month (August, 22 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorJan 1671 µg/m³Aug 2422 µg/m³
PM2.5 (µg/m³)Level
Jan72Unhealthy
Feb61Unhealthy
Mar42Poor
Apr40Poor
May29Moderate
Jun27Moderate
Jul25Moderate
Aug22Moderate
Sep22Moderate
Oct27Moderate
Nov36Poor
Dec61Unhealthy
Location & terrain

Where is Grand-Bassam?

Grand-Bassam sits at 5.2°N, 3.7°W, 7 m above sea level, in Ivory Coast. The nearest listed city is Bonoua, 17 km away.

Ahigbé KoffikroAnyama

Topography around Grand-Bassam

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

Within 3 km, the terrain around Grand-Bassam has only modest variations in elevation — a maximum elevation change of 14 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 98 m; within 80 km, only modest variations in elevation — a maximum elevation change of 201 m.

The land around Grand-Bassam is covered by artificial surfaces (29%), grassland (22%) and water (21%) within 3 km, water (49%) and trees (34%) within 16 km, and trees (55%) and water (38%) within 80 km.

3 km
14 m
16 km
98 m
80 km
201 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Bonoua 17 km · Bingerville 23 km · Koumassi 27 km · Marcory 30 km · Abidjan 33 km · Abobo 38 km · Ahigbé Koffikro 45 km · Anyama 47 km

Ivory Coast travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 37% of US
price level, 2025
GDP per capita
$3,050
2025
Happiness
5.1 / 10
World Happiness, 2025
Safe drinking water
36%
of population, 2024
Road deaths
24.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Very low
EF EPI 393

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 Grand-Bassam (5.2118°, -3.7388°, elevation 7 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).