Njala weather in September

In September, Njala sees average daytime highs of 29°C and overnight lows near 22°C, with 403 mm of rain across 29.2 wet days and about 12 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 0% 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 Njala's 10th-clearest and 6th-windiest month. For the whole year in context, see Njala's year-round climate.

Daytime high
29°
10th warmest
Overnight low
22°
6th coldest
Rainfall
403 mm
29.2 wet days
Daylight
12 hours
6:41 AM – 6:44 PM
Cloud cover
87%
10th clearest
Wind
5 km/h
6th windiest
Solar energy
3.85 kWh/m²
Travel score
2.9
out of 10

Njala is place in Southern Province, Sierra Leone.

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 29°C through the month.

A typical September day in Njala reaches about 29°C in the afternoon and slips back to 22°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62822
72822
82822
92822
102822
112822
122822
132922
142922
152922
162922
172922
182922
192922
202922
212922
222922
232923
242923
252923
262923
272923
282923
292923
302923

How September really feels in Njala

Once humidity and wind are folded in, September averages 12 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
12
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.

Njala 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°133.411.64.1
Feb35° / 23°143.311.73.0
Mar35° / 24°449.811.92.7
Apr33° / 24°9616.312.22.8
May31° / 24°22426.312.42.7
Jun29° / 23°32128.812.52.8
Jul28° / 22°39729.212.43.2
Aug28° / 22°49629.512.33.3
Sep29° / 22°40329.2122.9
Oct30° / 23°22828.911.82.9
Nov30° / 22°8918.611.63.9
Dec31° / 22°204.911.55.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 96%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1298
2298
3298
4298
5298
6298
7298
8397
9397
10397
11397
12397
13397
14496
15496
16496
17496
18595
19595
20595
21595
22694
23694
24694
25694
26793
27793
28793
29793
30793

Chance of precipitation in September

Any precipitation

Njala gets around 403 mm of rain over 29.2 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 97% and peaks near 98% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
197
297
397
497
597
697
797
897
997
1097
1197
1297
1397
1497
1597
1698
1798
1898
1998
2098
2198
2298
2398
2498
2598
2698
2798
2897
2997
3097

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26982
27982
28982
29982
30982

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:43 AM to 6:39 AM, and sunset from 6:53 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:436:53
212.26:436:52
312.16:436:51
412.16:436:51
512.16:436:50
612.16:426:50
712.16:426:49
812.16:426:49
912.16:426:48
1012.16:426:47
1112.16:426:47
1212.16:426:46
1312.16:416:46
1412.16:416:45
1512.16:416:44
1612.06:416:44
1712.06:416:43
1812.06:416:43
1912.06:416:42
2012.06:406:41
2112.06:406:41
2212.06:406:40
2312.06:406:40
2412.06:406:39
2512.06:406:38
2612.06:406:38
2712.06:406:37
2812.06:406:37
2911.96:396:36
3011.96:396:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.85 kWh/m².

For context, solar energy here swings from a low near 3.28 kWh/m² to a high of 5.69 kWh/m² in February across the year — September's 3.85 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.5Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.7Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
194.0Moderate
204.0Moderate
214.0Bright
224.0Bright
234.0Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Njala

In seasonPeak

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

Njala's monsoon runs May–October, when most of the year's rain falls.

Njala sees seasonal dust haze (February–April), heaviest in February.

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

Is September a good time to visit Njala?

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

2.9
Sightseeing
7th-best month of the year
3.6
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Njala.

What to pack for Njala in September

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

In September, Njala sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

UV index in Njala 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 Njala peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 20UV 13Dec 15UV 8
UV index (midday)Level
Jan10Very high
Feb12Extreme
Mar12Extreme
Apr10Very high
May12Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov9Very high
Dec8Very high

Air quality in Njala 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 Njala is worst in April — around 202 µg/m³ PM2.5 (very unhealthy), about 19.4× the cleanest month (August, 10 µg/m³).

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

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyModerateGoodModeratePoorApr 9200 µg/m³Aug 2011 µg/m³
PM2.5 (µg/m³)Level
Jan70Unhealthy
Feb77Unhealthy
Mar194Very unhealthy
Apr202Very unhealthy
May33Moderate
Jun19Moderate
Jul13Moderate
Aug10Good
Sep11Good
Oct17Moderate
Nov25Moderate
Dec50Poor
Location & terrain

Where is Njala?

Njala sits at 8.2°N, 12.0°W, 67 m above sea level, in Sierra Leone. The nearest listed city is Mile 91, 34 km away.

Mile 91BumpeBoMakeniLunsarKenemaPort LokoWaterloo

Topography around Njala

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

Within 3 km, the terrain around Njala has only modest variations in elevation — a maximum elevation change of 51 m around an average of 61 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 96 m; within 80 km, large variations in elevation — a maximum elevation change of 820 m.

The land around Njala is covered by grassland (54%) and shrubs (28%) within 3 km, grassland (53%), shrubs (26%) and trees (20%) within 16 km, and trees (57%), grassland (21%) and shrubs (20%) within 80 km.

3 km
51 m
16 km
96 m
80 km
820 m
treesshrubsgrasslandwatermangroves
September weather nearby: Mile 91 34 km · Bumpe 40 km · Bo 43 km · Makeni 73 km · Lunsar 76 km · Kenema 99 km · Port Loko 104 km · Waterloo 117 km

Sierra Leone travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 24% of US
price level, 2025
GDP per capita
$846
2025
Happiness
3.3 / 10
World Happiness, 2025
Safe drinking water
11%
of population, 2024
Homicide rate
2.2
per 100k, 2020
Road deaths
33
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Muslim 77%Christian 23%

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 Njala (8.2323°, -12.0156°, elevation 67 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).