Koumbia weather in September

In September, Koumbia sees average daytime highs of 31°C and overnight lows near 23°C, with 297 mm of rain across 26.8 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 2% 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 Koumbia's 10th-clearest and 10th-windiest month. For the whole year in context, see Koumbia's year-round climate.

Daytime high: 31°; 10th warmest
Overnight low: 23°; 6th coldest
Rainfall: 297 mm; 26.8 wet days
Daylight: 12 h 06 min; 6:46 AM – 6:50 PM
Cloud cover: 82%; 10th clearest
Wind: 7 km/h; 10th windiest
Solar energy: 4.62 kWh/m²
Travel score: 2.7; out of 10

← August Koumbia year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Koumbia reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	30	30	30	30	30	30	30	30	30	30	30	30	30	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

How September really feels in Koumbia

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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Koumbia weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	34° / 19°	1	0.3	11.4	4.1
Feb	36° / 21°	1	0.1	11.6	2.9
Mar	37° / 23°	1	0.1	11.9	1.9
Apr	38° / 25°	2	0.7	12.3	1.5
May	36° / 25°	35	6.8	12.5	2.0
Jun	32° / 24°	130	17	12.7	3.0
Jul	30° / 23°	289	26.7	12.6	3.0
Aug	30° / 23°	374	28.3	12.4	2.9
Sep	31° / 23°	297	26.8	12.1	2.7
Oct	32° / 23°	178	20.6	11.7	3.1
Nov	32° / 21°	26	4.2	11.5	4.4
Dec	33° / 19°	2	0.3	11.3	4.4

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 10% of September, with mostly cloudy or overcast conditions the remaining 89%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	6	6	6	6	7	7	7	7	7	8	8	8	9	9	9	10	10	11	12	13	14	14	16	17	17	19	20	20	21	22
Cloudier (%)	94	94	94	94	93	93	93	93	93	92	92	92	91	91	91	90	90	89	88	87	86	86	84	83	83	81	80	80	79	78

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	8	92
11	8	92
12	8	92
13	9	91
14	9	91
15	9	91
16	10	90
17	10	90
18	11	89
19	12	88
20	13	87
21	14	86
22	14	86
23	16	84
24	17	83
25	17	83
26	19	81
27	20	80
28	20	80
29	21	79
30	22	78

Chance of precipitation in September

Any precipitation

Koumbia gets around 297 mm of rain over 26.8 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 89% and peaks near 92% on the wettest days. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	91	91	91	91	91	91	91	91	92	92	92	92	92	92	91	91	91	91	90	89	89	88	87	86	85	84	83	82	82	81

	Rain chance (%)
1	91
2	91
3	91
4	91
5	91
6	91
7	91
8	91
9	92
10	92
11	92
12	92
13	92
14	92
15	91
16	91
17	91
18	91
19	90
20	89
21	89
22	88
23	87
24	86
25	85
26	84
27	83
28	82
29	82
30	81

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 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	97	97	97	96	96	96	96	95	95	94	94	94	93	93	93	93	92	92	92	92	92	93	92	92	92	92	92	91	90	90
Miserable (%)	3	3	3	4	4	4	4	5	5	6	6	6	7	7	7	7	8	8	8	8	8	7	8	8	8	8	8	9	10	10

	Oppressive (%)	Miserable (%)
1	97	3
2	97	3
3	97	3
4	96	4
5	96	4
6	96	4
7	96	4
8	95	5
9	95	5
10	94	6
11	94	6
12	94	6
13	93	7
14	93	7
15	93	7
16	93	7
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	93	7
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	91	9
29	90	10
30	90	10

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	8	8	8	7	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	8	calm
2	8	calm
3	8	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm

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 6:47 AM to 6:46 AM, and sunset from 7:01 PM to 6:41 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9
Sunrise (AM)	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:47	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46	6:46
Sunset (PM)	7:01	7:00	6:59	6:59	6:58	6:57	6:57	6:56	6:55	6:54	6:54	6:53	6:52	6:52	6:51	6:50	6:50	6:49	6:48	6:47	6:47	6:46	6:45	6:45	6:44	6:43	6:43	6:42	6:41	6:41

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	6:47	7:01
2	12.2	6:47	7:00
3	12.2	6:47	6:59
4	12.2	6:47	6:59
5	12.2	6:47	6:58
6	12.2	6:47	6:57
7	12.2	6:47	6:57
8	12.2	6:47	6:56
9	12.1	6:47	6:55
10	12.1	6:47	6:54
11	12.1	6:47	6:54
12	12.1	6:47	6:53
13	12.1	6:46	6:52
14	12.1	6:46	6:52
15	12.1	6:46	6:51
16	12.1	6:46	6:50
17	12.1	6:46	6:50
18	12.0	6:46	6:49
19	12.0	6:46	6:48
20	12.0	6:46	6:47
21	12.0	6:46	6:47
22	12.0	6:46	6:46
23	12.0	6:46	6:45
24	12.0	6:46	6:45
25	12.0	6:46	6:44
26	12.0	6:46	6:43
27	11.9	6:46	6:43
28	11.9	6:46	6:42
29	11.9	6:46	6:41
30	11.9	6:46	6:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.62 kWh/m².

For context, solar energy here swings from a low near 4.11 kWh/m² to a high of 6.97 kWh/m² in April across the year — September's 4.62 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.2	4.2	4.3	4.3	4.3	4.3	4.4	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.8	4.8	4.9	4.9	4.9	4.9	4.9	4.9
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.2	Bright
2	4.2	Bright
3	4.3	Bright
4	4.3	Bright
5	4.3	Bright
6	4.3	Bright
7	4.4	Bright
8	4.4	Bright
9	4.4	Bright
10	4.5	Bright
11	4.5	Bright
12	4.5	Bright
13	4.6	Bright
14	4.6	Bright
15	4.6	Bright
16	4.7	Bright
17	4.7	Bright
18	4.7	Bright
19	4.8	Bright
20	4.8	Bright
21	4.8	Bright
22	4.8	Bright
23	4.8	Bright
24	4.8	Bright
25	4.9	Bright
26	4.9	Bright
27	4.9	Bright
28	4.9	Bright
29	4.9	Bright
30	4.9	Bright

Planning a trip in September

Hazard calendar for Koumbia

In seasonPeak

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

Koumbia's monsoon runs July–October, when most of the year's rain falls.

Koumbia sees seasonal dust haze (February–June), heaviest in June.

Monsoon

Dust

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Koumbia?

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

2.7

Sightseeing

9th-best month of the year

3.9

Beach & pool

11th-best month of the year

September is a weaker month for outdoor sightseeing in Koumbia.

What to pack for Koumbia in September

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

In September, Koumbia sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in Koumbia in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Koumbia peaks around March 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 8 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	9	11	13	12	10	12	12	13	13	11	9	7
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	9	Very high
Feb	11	Extreme
Mar	13	Extreme
Apr	12	Extreme
May	10	Extreme
Jun	12	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	13	Extreme
Oct	11	Extreme
Nov	9	Very high
Dec	7	Very high

Air quality in Koumbia 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 Koumbia is worst in May — around 90 µg/m³ PM2.5 (unhealthy), about 7.2× the cleanest month (August, 12 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	48	62	59	83	90	29	16	12	15	31	34	47
Level	Poor	Unhealthy	Unhealthy	Unhealthy	Unhealthy	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	48	Poor
Feb	62	Unhealthy
Mar	59	Unhealthy
Apr	83	Unhealthy
May	90	Unhealthy
Jun	29	Moderate
Jul	16	Moderate
Aug	12	Moderate
Sep	15	Moderate
Oct	31	Moderate
Nov	34	Moderate
Dec	47	Poor

Location & terrain

Where is Koumbia?

Koumbia sits at 11.8°N, 13.5°W, 115 m above sea level, in Guinea. The nearest listed city is Wendou Borou, 58 km away.

Topography around Koumbia

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

Within 3 km, the terrain around Koumbia has only modest variations in elevation — a maximum elevation change of 158 m around an average of 147 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 410 m; within 80 km, large variations in elevation — a maximum elevation change of 1,072 m.

The land around Koumbia is covered by trees (41%) and shrubs (38%) within 3 km, trees (49%) and shrubs (33%) within 16 km, and trees (60%) and shrubs (20%) within 80 km.

3 km

158 m

trees 41%

16 km

410 m

trees 49%

80 km

1,072 m

trees 60%

treesshrubsgrasslandcroplandartificial surfaces

← August Koumbia year-round climate October →Best places to visit in September

September weather nearby: Wendou Borou 58 km · Kamabi 67 km · Koundara 79 km · Sangarédi 83 km · Gabú 95 km · Télimélé 112 km · Boké 129 km · Bafatá 133 km

Guinea travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / F / K; 220 V · 50 Hz
Prices: ≈ 34% of US; price level, 2025
GDP per capita: $1,877; 2025
Happiness: 4.6 / 10; World Happiness, 2025
Road deaths: 29.7; per 100k/yr, 2019
Income group: Lower middle; World Bank
Religion

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 Koumbia (11.8°, -13.5°, elevation 115 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).

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	8	92
11	8	92
12	8	92
13	9	91
14	9	91
15	9	91
16	10	90
17	10	90
18	11	89
19	12	88
20	13	87
21	14	86
22	14	86
23	16	84
24	17	83
25	17	83
26	19	81
27	20	80
28	20	80
29	21	79
30	22	78

	Rain chance (%)
1	91
2	91
3	91
4	91
5	91
6	91
7	91
8	91
9	92
10	92
11	92
12	92
13	92
14	92
15	91
16	91
17	91
18	91
19	90
20	89
21	89
22	88
23	87
24	86
25	85
26	84
27	83
28	82
29	82
30	81

	Oppressive (%)	Miserable (%)
1	97	3
2	97	3
3	97	3
4	96	4
5	96	4
6	96	4
7	96	4
8	95	5
9	95	5
10	94	6
11	94	6
12	94	6
13	93	7
14	93	7
15	93	7
16	93	7
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	93	7
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	91	9
29	90	10
30	90	10

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	8	92
11	8	92
12	8	92
13	9	91
14	9	91
15	9	91
16	10	90
17	10	90
18	11	89
19	12	88
20	13	87
21	14	86
22	14	86
23	16	84
24	17	83
25	17	83
26	19	81
27	20	80
28	20	80
29	21	79
30	22	78

	Rain chance (%)
1	91
2	91
3	91
4	91
5	91
6	91
7	91
8	91
9	92
10	92
11	92
12	92
13	92
14	92
15	91
16	91
17	91
18	91
19	90
20	89
21	89
22	88
23	87
24	86
25	85
26	84
27	83
28	82
29	82
30	81

	Oppressive (%)	Miserable (%)
1	97	3
2	97	3
3	97	3
4	96	4
5	96	4
6	96	4
7	96	4
8	95	5
9	95	5
10	94	6
11	94	6
12	94	6
13	93	7
14	93	7
15	93	7
16	93	7
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	93	7
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	91	9
29	90	10
30	90	10

	Avg high (°C)	Avg low (°C)
1	30	23
2	30	23
3	30	23
4	30	23
5	30	23
6	30	23
7	30	23
8	30	23
9	30	23
10	30	23
11	30	23
12	30	23
13	30	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	7	93
6	7	93
7	7	93
8	7	93
9	7	93
10	8	92
11	8	92
12	8	92
13	9	91
14	9	91
15	9	91
16	10	90
17	10	90
18	11	89
19	12	88
20	13	87
21	14	86
22	14	86
23	16	84
24	17	83
25	17	83
26	19	81
27	20	80
28	20	80
29	21	79
30	22	78

	Rain chance (%)
1	91
2	91
3	91
4	91
5	91
6	91
7	91
8	91
9	92
10	92
11	92
12	92
13	92
14	92
15	91
16	91
17	91
18	91
19	90
20	89
21	89
22	88
23	87
24	86
25	85
26	84
27	83
28	82
29	82
30	81

	Oppressive (%)	Miserable (%)
1	97	3
2	97	3
3	97	3
4	96	4
5	96	4
6	96	4
7	96	4
8	95	5
9	95	5
10	94	6
11	94	6
12	94	6
13	93	7
14	93	7
15	93	7
16	93	7
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	93	7
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	91	9
29	90	10
30	90	10