Nioro weather in September

In September, Nioro sees average daytime highs of 34°C and overnight lows near 25°C, with 76 mm of rain across 10.4 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 33°C in the first days to 36°C by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Nioro's 11th-clearest and 11th-windiest month. For the whole year in context, see Nioro's year-round climate.

Daytime high
34°
8th warmest
Overnight low
25°
8th coldest
Rainfall
76 mm
10.4 wet days
Daylight
12 h 06 min
6:30 AM – 6:35 PM
Cloud cover
55%
11th clearest
Wind
9 km/h
11th windiest
Solar energy
6.13 kWh/m²
Travel score
2.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 33°C in the first days to 36°C by the end.

A typical September day in Nioro reaches about 34°C in the afternoon and slips back to 25°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 37°C. Set against its neighbours, September runs about 2°C warmer than August and about 3°C cooler than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13324
23324
33324
43324
53324
63324
73325
83325
93325
103325
113425
123425
133425
143425
153425
163425
173425
183425
193525
203525
213525
223525
233525
243525
253625
263625
273625
283625
293625
303625

How September really feels in Nioro

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
16 feel dangerously hot (≥ 39°C)
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.

Nioro weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 17°10.211.25.8
Feb34° / 19°0011.53.9
Mar38° / 22°00.111.91.6
Apr41° / 26°10.312.30.0
May42° / 28°51.212.70.0
Jun40° / 29°164.112.90.2
Jul36° / 26°6810.312.82.2
Aug33° / 25°14514.512.53.2
Sep34° / 25°7610.412.12.8
Oct38° / 24°173.911.71.5
Nov36° / 21°10.211.32.6
Dec32° / 17°00.111.15.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34357
44456
54555
64654
74753
84852
94951
105050
115149
125347
135446
145446
155644
165743
175743
185842
195941
205941
216040
226040
236139
246139
256238
266238
276238
286238
296238
306238

Chance of precipitation in September

Any precipitation

Nioro gets around 76 mm of rain over 10.4 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 35% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
245
344
444
543
642
741
840
940
1039
1138
1238
1337
1436
1536
1635
1734
1834
1933
2032
2131
2230
2329
2428
2527
2626
2725
2825
2924
3023

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 96% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100018415
200018415
300018316
400018316
500028117
600028117
700028117
800028117
900037918
1000037918
1100038017
1200047917
1300147817
1400157717
1500167716
1600177616
1700187615
1800297514
19002107513
20002117512
21103127311
22113137210
2311415709
2421516688
2521518677
2632619637
2732721616
2843822585
2953924554
3054925534

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 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 24 minutes over September. Sunrise moves from 6:29 AM to 6:31 AM, and sunset from 6:47 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:296:47
212.36:296:46
312.36:296:46
412.36:296:45
512.26:296:44
612.26:296:43
712.26:306:42
812.26:306:42
912.26:306:41
1012.26:306:40
1112.26:306:39
1212.16:306:38
1312.16:306:38
1412.16:306:37
1512.16:306:36
1612.16:306:35
1712.16:306:34
1812.16:306:34
1912.06:306:33
2012.06:306:32
2112.06:316:31
2212.06:316:30
2312.06:316:30
2412.06:316:29
2512.06:316:28
2611.96:316:27
2711.96:316:26
2811.96:316:26
2911.96:316:25
3011.96:316:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.13 kWh/m².

For context, solar energy here swings from a low near 5.22 kWh/m² to a high of 7.31 kWh/m² in April across the year — September's 6.13 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
76.0Bright
86.0Bright
96.0Intense
106.0Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.2Intense
Planning a trip in September

Hazard calendar for Nioro

In seasonPeak

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

Nioro sees seasonal dust haze (January–October), heaviest in June.

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

Is September a good time to visit Nioro?

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

2.8
Sightseeing
5th-best month of the year
5.6
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Nioro.

What to pack for Nioro in September

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

In September, Nioro sees daytime highs around 34°C and nights near 25°C. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.

light clothessun protectionrain gear

UV index in Nioro 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 Nioro peaks around March 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 21UV 13Dec 18UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May10Extreme
Jun10Extreme
Jul11Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov9Very high
Dec7Very high

Air quality in Nioro 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 Nioro is worst in February — around 77 µg/m³ PM2.5 (unhealthy), about 4.5× the cleanest month (August, 17 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyFeb 1476 µg/m³Aug 2118 µg/m³
PM2.5 (µg/m³)Level
Jan72Unhealthy
Feb77Unhealthy
Mar70Unhealthy
Apr58Unhealthy
May53Poor
Jun53Poor
Jul28Moderate
Aug17Moderate
Sep20Moderate
Oct39Poor
Nov42Poor
Dec65Unhealthy
Location & terrain

Where is Nioro?

Nioro sits at 15.2°N, 9.6°W, 215 m above sea level, in Mali. The nearest listed city is Diéma, 88 km away.

ṬinṭâneMahinaAyoun El AtrousEl ’AyoûnTembedghaBafoulabéKayes

Topography around Nioro

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

Within 3 km, the terrain around Nioro has only modest variations in elevation — a maximum elevation change of 55 m around an average of 237 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 134 m; within 80 km, significant variations in elevation — a maximum elevation change of 281 m.

The land around Nioro is covered by grassland (53%) and bare terrain (20%) within 3 km, grassland (79%) within 16 km, and grassland (84%) within 80 km.

3 km
55 m
16 km
134 m
80 km
281 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Diéma 88 km · Ṭinṭâne 144 km · Mahina 157 km · Ayoun El Atrous 159 km · El ’Ayoûn 174 km · Tembedgha 189 km · Bafoulabé 207 km · Kayes 217 km

Mali travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type C / E
220 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$1,193
2025
Happiness
4.6 / 10
World Happiness, 2025
Road deaths
22.7
per 100k/yr, 2019
Income group
Low
World Bank
English
Very low
EF EPI 408
Religion
Muslim 94%Christian 3%none 3%animist 1%

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 Nioro (15.2307°, -9.5936°, elevation 215 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).