Gao weather in September

In September, Gao sees average daytime highs of 30°C and overnight lows near 23°C, with 140 mm of rain across 18.7 wet days and about 12.1 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 30°C in the first days to 31°C by the end. The sky is clear or mostly clear about 21% 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 Gao's 10th-clearest and 12th-windiest month. For the whole year in context, see Gao's year-round climate.

Daytime high
30°
11th warmest
Overnight low
23°
6th coldest
Rainfall
140 mm
18.7 wet days
Daylight
12 h 06 min
6:01 AM – 6:05 PM
Cloud cover
64%
10th clearest
Wind
7 km/h
12th windiest
Solar energy
5.53 kWh/m²
Travel score
3.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 30°C in the first days to 31°C by the end.

A typical September day in Gao reaches about 30°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 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)
12923
23023
33023
43023
53023
63023
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293223
303223

How September really feels in Gao

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.

Gao weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 20°00.111.44.6
Feb36° / 22°10.311.62.9
Mar38° / 26°41.311.91.2
Apr38° / 27°235.312.31.0
May36° / 26°469.812.52.0
Jun33° / 25°6512.312.73.2
Jul31° / 23°13919.612.63.6
Aug29° / 23°22024.112.43.5
Sep30° / 23°14018.712.13.8
Oct33° / 23°43811.73.5
Nov35° / 21°20.411.53.1
Dec34° / 20°0011.34.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22773
32773
42872
52971
63070
73268
83268
93367
103565
113565
123664
133862
143961
154159
164159
174357
184456
194654
204852
215050
225248
235347
245446
255644
265842
275941
286040
296139
306238

Chance of precipitation in September

Any precipitation

Gao gets around 140 mm of rain over 18.7 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 62% and peaks near 77% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
177
276
375
475
574
673
772
871
970
1069
1168
1267
1366
1465
1564
1663
1762
1860
1959
2058
2156
2255
2353
2452
2551
2650
2748
2847
2945
3044

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.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10982
20982
30973
40973
50973
60973
70964
80964
90964
100955
110955
120946
130946
140937
150928
160919
170919
1809010
1909010
2009010
2108911
2208911
2308911
2408911
2509010
2609010
2718910
281909
291909
301918

Wind in September

Winds average 7 km/h in September, the calmest month.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
298calm
308calm

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 6:02 AM to 6:01 AM, and sunset from 6:15 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:026:15
212.26:026:15
312.26:026:14
412.26:026:13
512.26:026:13
612.26:026:12
712.26:016:11
812.26:016:11
912.16:016:10
1012.16:016:09
1112.16:016:08
1212.16:016:08
1312.16:016:07
1412.16:016:06
1512.16:016:06
1612.16:016:05
1712.16:016:04
1812.06:016:04
1912.06:016:03
2012.06:016:02
2112.06:016:01
2212.06:016:01
2312.06:016:00
2412.06:015:59
2512.06:015:59
2612.06:015:58
2711.96:015:57
2811.96:015:57
2911.96:015:56
3011.96:015:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.53 kWh/m².

For context, solar energy here swings from a low near 4.83 kWh/m² to a high of 6.64 kWh/m² in March across the year — September's 5.53 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.1Bright
45.1Bright
55.1Bright
65.2Bright
75.2Bright
85.3Bright
95.3Bright
105.3Bright
115.4Bright
125.4Bright
135.4Bright
145.5Bright
155.5Bright
165.5Bright
175.6Bright
185.6Bright
195.6Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.9Bright
305.9Bright
Planning a trip in September

Hazard calendar for Gao

In seasonPeak

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

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

Gao sees seasonal dust haze (February–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 Gao?

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

3.8
Sightseeing
3rd-best month of the year
5.3
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Gao.

What to pack for Gao in September

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

In September, Gao sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

UV index in Gao 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 Gao peaks around March 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 16UV 14Dec 13UV 9
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar14Extreme
Apr11Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Gao 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 Gao is worst in February — around 74 µg/m³ PM2.5 (unhealthy), about 5.1× the cleanest month (August, 15 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorFeb 1973 µg/m³Aug 1115 µg/m³
PM2.5 (µg/m³)Level
Jan63Unhealthy
Feb74Unhealthy
Mar70Unhealthy
Apr52Poor
May28Moderate
Jun22Moderate
Jul16Moderate
Aug15Moderate
Sep21Moderate
Oct32Moderate
Nov43Poor
Dec57Unhealthy
Location & terrain

Where is Gao?

Gao sits at 11.6°N, 2.2°W, 325 m above sea level, in Burkina Faso. The nearest listed city is Tô, 23 km away.

LéoFara DepartmentKokologoKoudougou

Topography around Gao

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

Within 3 km, the terrain around Gao has only modest variations in elevation — a maximum elevation change of 44 m around an average of 332 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 84 m; within 80 km, only modest variations in elevation — a maximum elevation change of 187 m.

The land around Gao is covered by shrubs (41%), cropland (33%) and grassland (26%) within 3 km, cropland (48%), shrubs (32%) and grassland (20%) within 16 km, and cropland (49%), shrubs (28%) and grassland (22%) within 80 km.

3 km
44 m
16 km
84 m
80 km
187 m
shrubsgrasslandcropland
September weather nearby: 23 km · Sapouy 45 km · Sabou 47 km · Tita 48 km · Léo 62 km · Fara Department 66 km · Kokologo 69 km · Koudougou 70 km

Burkina Faso travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 37% of US
price level, 2025
GDP per capita
$1,148
2025
Happiness
4.5 / 10
World Happiness, 2025
Homicide rate
1.3
per 100k, 2017
Road deaths
31
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Muslim 64%Roman Catholic 20%Animiste 9%Protestant 6%

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 Gao (11.6497°, -2.1778°, elevation 325 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).