Longonjo weather in September

In September, Longonjo sees average daytime highs of 29°C and overnight lows near 13°C, with 24 mm of rain across 4.3 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 8th-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 51% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Longonjo's 5th-clearest and 5th-windiest month. For the whole year in context, see Longonjo's year-round climate.

Daytime high
29°
1st warmest
Overnight low
13°
5th coldest
Rainfall
24 mm
4.3 wet days
Daylight
11 h 54 min
5:55 AM – 5:51 PM
Cloud cover
38%
5th clearest
Wind
7 km/h
5th windiest
Solar energy
6.43 kWh/m²
Travel score
6.5
out of 10

Longonjo is settlement in Angola.

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 Longonjo reaches about 29°C in the afternoon and slips back to 13°C overnight — a 16°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12912
22912
32913
42913
52913
62913
72913
82913
92913
102913
112913
122913
132913
142913
152913
162913
172913
182914
192914
202914
212914
222914
232914
242914
252914
262914
272914
282914
292914
302914

Longonjo weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 15°20320.312.75.0
Feb24° / 15°19117.912.45.1
Mar24° / 15°22723.912.14.6
Apr25° / 14°8213.411.76.3
May25° / 12°4111.48.9
Jun25° / 0011.39.5
Jul25° / 0011.39.3
Aug28° / 11°10.211.68.3
Sep29° / 13°244.311.96.5
Oct27° / 15°15419.512.35.0
Nov25° / 15°25724.812.64.3
Dec24° / 15°24323.212.74.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 51% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 30% of September, with mostly cloudy or overcast conditions the remaining 19%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18614
28515
38515
48515
58515
68515
78416
88416
98416
108317
118317
128317
138317
148218
158218
168218
178119
188119
198020
208020
217822
227822
237723
247723
257723
267525
277525
287426
297327
307228

Chance of precipitation in September

Any precipitation

Longonjo gets around 24 mm of rain over 4.3 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 15% and peaks near 33% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
12
23
33
43
54
64
75
86
97
107
119
1210
1311
1412
1513
1614
1716
1817
1918
2019
2121
2222
2323
2424
2526
2627
2728
2829
2931
3033

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59820
69820
79820
89730
99730
109640
119550
129460
139370
149280
159190
1690100
1788120
1887130
1985150
2083170
2182180
2280200
2377221
2476231
2574251
2672262
2770282
2868293
2966304
3064315

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 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over September. Sunrise moves from 6:06 AM to 5:45 AM, and sunset from 5:51 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:065:51
211.86:065:51
311.86:055:51
411.86:045:51
511.86:035:51
611.86:035:51
711.86:025:51
811.86:015:51
911.86:015:51
1011.96:005:51
1111.95:595:51
1211.95:585:51
1311.95:585:51
1411.95:575:51
1511.95:565:51
1611.95:555:51
1711.95:555:51
1812.05:545:51
1912.05:535:51
2012.05:525:51
2112.05:525:51
2212.05:515:51
2312.05:505:51
2412.05:505:51
2512.05:495:51
2612.15:485:51
2712.15:475:51
2812.15:475:51
2912.15:465:51
3012.15:455:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.43 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.4 kWh/m² to a high of 6.43 kWh/m² in September across the year — September's 6.43 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.4Intense
56.4Intense
66.4Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
Planning a trip in September

Hazard calendar for Longonjo

In seasonPeak

None of Longonjo's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Longonjo's monsoon runs October–March, when most of the year's rain falls.

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

Is September a good time to visit Longonjo?

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

6.5
Sightseeing
5th-best month of the year
8.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Longonjo for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Longonjo in September

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

In September, Longonjo sees daytime highs around 29°C and nights near 13°C. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Longonjo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Longonjo peaks around January 18 at about 17 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 20 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 18UV 17Jul 20UV 9
UV index (midday)Level
Jan17Extreme
Feb15Extreme
Mar16Extreme
Apr13Extreme
May11Extreme
Jun10Very high
Jul9Very high
Aug9Very high
Sep11Extreme
Oct13Extreme
Nov14Extreme
Dec14Extreme

Air quality in Longonjo 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 Longonjo is worst in August — around 101 µg/m³ PM2.5 (unhealthy), about 10.6× the cleanest month (January, 10 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateUnhealthyModerateGoodAug 1298 µg/m³Jan 110 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar12Moderate
Apr14Moderate
May27Moderate
Jun53Poor
Jul87Unhealthy
Aug101Unhealthy
Sep43Poor
Oct19Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Longonjo?

Longonjo sits at 12.9°S, 15.2°E, 1,451 m above sea level, in Angola. The nearest listed city is Ucuma, 21 km away.

Topography around Longonjo

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

Within 3 km, the terrain around Longonjo has significant variations in elevation — a maximum elevation change of 323 m around an average of 1,470 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 981 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,623 m.

The land around Longonjo is covered by cropland (65%) within 3 km, shrubs (30%), cropland (30%) and trees (28%) within 16 km, and cropland (33%), shrubs (25%) and grassland (25%) within 80 km.

3 km
323 m
16 km
981 m
80 km
1,623 m
treesshrubsgrasslandcroplandartificial surfaces
September weather nearby: Ucuma 21 km · Caála 34 km · Ecunna 38 km · Huambo 55 km · Ganda 68 km · Londuimbali 75 km · Balombo 80 km · Alto Hama 82 km

Angola travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 35% of US
price level, 2025
GDP per capita
$3,129
2025
Happiness
3.8 / 10
World Happiness, 2017
Homicide rate
4.1
per 100k, 2016
Road deaths
26.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Very low
EF EPI 413
Religion
Roman Catholic 41%Protestant 38%none 12%other 9%

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 Longonjo (-12.9079°, 15.2485°, elevation 1,451 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).