Kollo weather in September

In September, Kollo sees average daytime highs of 34°C and overnight lows near 25°C, with 50 mm of rain across 7.5 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 32°C in the first days to 36°C by the end. The sky is clear or mostly clear about 44% 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 Kollo's 10th-clearest and 11th-windiest month. For the whole year in context, see Kollo's year-round climate.

Daytime high
34°
8th warmest
Overnight low
25°
8th coldest
Rainfall
50 mm
7.5 wet days
Daylight
12 h 06 min
6:43 AM – 6:47 PM
Cloud cover
49%
10th clearest
Wind
10 km/h
11th windiest
Solar energy
6.24 kWh/m²
Travel score
3.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 32°C in the first days to 36°C by the end.

A typical September day in Kollo reaches about 34°C in the afternoon and slips back to 25°C overnight — a 9°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)
13224
23224
33224
43224
53324
63325
73325
83325
93325
103325
113325
123325
133325
143425
153425
163425
173425
183425
193425
203525
213525
223525
233525
243525
253525
263525
273626
283626
293626
303626

How September really feels in Kollo

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
13 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.

Kollo weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 17°0011.35.7
Feb34° / 20°00.111.63.7
Mar38° / 23°10.311.91.2
Apr40° / 27°30.912.30.0
May40° / 29°92.512.60.3
Jun37° / 27°255.412.81.7
Jul34° / 26°6811.612.73.0
Aug32° / 24°13215.712.43.5
Sep34° / 25°507.512.13.2
Oct37° / 25°92.311.71.8
Nov36° / 20°0011.42.6
Dec33° / 18°0011.24.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24456
34654
44852
54951
65050
75149
85347
95446
105545
115644
125743
135941
146040
156139
166238
176436
186436
196535
206733
216832
226931
237030
247129
257327
267327
277327
287426
297426
307426

Chance of precipitation in September

Any precipitation

Kollo gets around 50 mm of rain over 7.5 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 26% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
243
342
441
539
638
736
835
933
1032
1131
1229
1328
1427
1526
1624
1723
1822
1921
2019
2118
2217
2316
2416
2515
2614
2713
2813
2912
3012

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 85% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100937
200937
300937
401927
501927
601927
701927
802917
902908
1002908
1103898
1203898
1304888
1405887
1505887
1606877
1707867
1808857
1909856
20010846
21011845
22012835
23114814
24115804
25117784
26219763
27220753
28222742
29324712
30326701

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 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
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:43 AM to 6:43 AM, and sunset from 6:58 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:436:58
212.26:436:57
312.26:436:57
412.26:436:56
512.26:436:55
612.26:436:55
712.26:436:54
812.26:436:53
912.26:436:52
1012.16:436:52
1112.16:436:51
1212.16:436:50
1312.16:436:49
1412.16:436:49
1512.16:436:48
1612.16:436:47
1712.16:436:46
1812.06:436:46
1912.06:436:45
2012.06:436:44
2112.06:436:43
2212.06:436:43
2312.06:436:42
2412.06:436:41
2512.06:436:40
2611.96:436:40
2711.96:436:39
2811.96:436:38
2911.96:436:38
3011.96:436:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.24 kWh/m².

For context, solar energy here swings from a low near 5.6 kWh/m² to a high of 7.02 kWh/m² in April across the year — September's 6.24 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.9Bright
35.9Bright
45.9Bright
56.0Bright
66.0Bright
76.0Intense
86.0Intense
96.1Intense
106.1Intense
116.1Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Kollo

In seasonPeak

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

Kollo sees seasonal dust haze (January–July), heaviest in March.

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

Is September a good time to visit Kollo?

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

3.2
Sightseeing
5th-best month of the year
6.1
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Kollo. The water and warmth also suit a beach or pool day.

What to pack for Kollo in September

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

In September, Kollo sees daytime highs around 34°C and nights near 25°C. Pack light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Kollo 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 Kollo peaks around August 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 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 highAug 18UV 13Dec 13UV 8
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar13Extreme
Apr10Extreme
May10Extreme
Jun11Extreme
Jul11Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Kollo 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 Kollo is worst in February — around 97 µg/m³ PM2.5 (unhealthy), about 5.0× the cleanest month (August, 20 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyFeb 2197 µg/m³Aug 1320 µg/m³
PM2.5 (µg/m³)Level
Jan87Unhealthy
Feb97Unhealthy
Mar96Unhealthy
Apr74Unhealthy
May46Poor
Jun34Moderate
Jul22Moderate
Aug20Moderate
Sep26Moderate
Oct48Poor
Nov62Unhealthy
Dec77Unhealthy
Location & terrain

Where is Kollo?

Kollo sits at 13.3°N, 2.3°E, 189 m above sea level, in Niger. The nearest listed city is Youri Kourtéré, 10 km away.

DossoTillabéri

Topography around Kollo

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

Within 3 km, the terrain around Kollo has only modest variations in elevation — a maximum elevation change of 32 m around an average of 183 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 97 m; within 80 km, only modest variations in elevation — a maximum elevation change of 119 m.

The land around Kollo is covered by grassland (46%) and cropland (30%) within 3 km, grassland (61%) within 16 km, and grassland (65%) within 80 km.

3 km
32 m
16 km
97 m
80 km
119 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Youri Kourtéré 10 km · Say 23 km · Niamey 34 km · Torodi 62 km · Birnin Gaouré 67 km · Baléyara 85 km · Dosso 97 km · Tillabéri 139 km

Niger travel facts

Travel advisory
Level 4
Do Not Travel
Power plugs
Type A / B / C / D / E / F
220 V · 50 Hz
Prices
≈ 36% of US
price level, 2025
GDP per capita
$775
2025
Happiness
4.9 / 10
World Happiness, 2025
Homicide rate
4.4
per 100k, 2012
Road deaths
25.5
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Muslim 96%ethnic religionist 4%Christian 0%agnostics and other 0%

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 Kollo (13.3043°, 2.339°, elevation 189 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).