Soyo weather in September

In September, Soyo sees average daytime highs of 23°C and overnight lows near 22°C, with 2 mm of rain across 0.7 wet days and about 12 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Soyo's 5th-clearest and 3rd-windiest month. For the whole year in context, see Soyo's year-round climate.

Daytime high
23°
10th warmest
Overnight low
22°
3rd coldest
Rainfall
2 mm
0.7 wet days
Daylight
12 hours
6:06 AM – 6:04 PM
Cloud cover
58%
5th clearest
Wind
16 km/h
3rd windiest
Solar energy
4.69 kWh/m²
Travel score
8.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 23°C through the month.

A typical September day in Soyo reaches about 23°C in the afternoon and slips back to 22°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 24°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

18°20°22°24°26°151015202530
Avg high (°C)Avg low (°C)
12222
22222
32222
42222
52222
62222
72322
82322
92322
102322
112322
122322
132322
142322
152322
162322
172323
182323
192323
202323
212323
222323
232323
242423
252423
262423
272423
282423
292423
302423

How September really feels in Soyo

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Soyo weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 26°8713.912.35.7
Feb28° / 26°8913.412.25.5
Mar28° / 27°9414.2125.5
Apr27° / 26°10014.411.95.6
May26° / 25°254.311.77.6
Jun24° / 23°0011.78.8
Jul22° / 21°0011.78.3
Aug22° / 21°10.211.88.1
Sep23° / 22°20.7128.2
Oct25° / 24°184.112.17.6
Nov26° / 25°6411.512.36.3
Dec26° / 25°7912.412.36.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 26% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
35050
45149
55149
65248
75347
85347
95446
105446
115545
125545
135545
145545
155545
165545
175545
185347
195347
205347
215347
225248
235248
245248
255248
265248
275149
285248
295248
305149

Chance of precipitation in September

Any precipitation

Soyo gets around 2 mm of rain over 0.7 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
72
82
92
102
112
122
132
142
152
162
173
183
193
203
213
223
233
243
253
263
273
283
293
303

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
118910
218910
318910
408911
508812
608713
708614
808515
908317
1008119
1107921
1207723
1307525
1407426
1507228
1607030
1706832
1806634
1906436
2006238
2106040
2205842
2305743
2405545
2505347
2605248
2705050
2804852
2904654
3004456

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over September. Sunrise moves from 6:14 AM to 5:58 AM, and sunset from 6:07 PM to 6:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:146:07
211.96:136:07
311.96:136:06
411.96:126:06
511.96:126:06
611.96:116:06
711.96:116:06
811.96:106:05
911.96:106:05
1011.96:096:05
1111.96:096:05
1211.96:086:05
1311.96:076:04
1412.06:076:04
1512.06:066:04
1612.06:066:04
1712.06:056:04
1812.06:056:03
1912.06:046:03
2012.06:046:03
2112.06:036:03
2212.06:036:03
2312.06:026:02
2412.06:026:02
2512.06:016:02
2612.06:006:02
2712.06:006:02
2812.05:596:02
2912.05:596:01
3012.05:586:01

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.69 kWh/m².

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 5.33 kWh/m² in February across the year — September's 4.69 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Soyo

In seasonPeak

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

Soyo's rainy season runs November–April, when most of the year's rain falls.

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

Is September a good time to visit Soyo?

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

8.2
Sightseeing
3rd-best month of the year
6.4
Beach & pool
4th-best month of the year

September is one of the better times to visit Soyo for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Soyo in September

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

In September, Soyo sees daytime highs around 23°C and nights near 22°C. Worth packing: light clothes and sun protection.

light clothessun protection

Sea temperature near Soyo in September

The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 km away) is warmest in March at about 28°C and coldest in August near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Tropical
Mar28Tropical
Apr28Warm
May26Warm
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep23Refreshing
Oct25Warm
Nov26Warm
Dec27Warm

UV index in Soyo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Soyo peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeMar 15UV 15Aug 10UV 6
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun7High
Jul6High
Aug6High
Sep10Very high
Oct13Extreme
Nov11Extreme
Dec10Extreme

Air quality in Soyo 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 Soyo is worst in July — around 22 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1521 µg/m³Nov 128 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar9Good
Apr10Good
May15Moderate
Jun19Moderate
Jul22Moderate
Aug18Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Soyo?

Soyo sits at 6.1°S, 12.4°E, 10 m above sea level, in Angola. The nearest listed city is Moanda, 23 km away.

MatadiTombôcoN'zetoTshelaKenge

Topography around Soyo

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

Within 3 km, the terrain around Soyo has only modest variations in elevation — a maximum elevation change of 24 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 314 m.

The land around Soyo is covered by artificial surfaces (31%), mangroves (30%) and water (22%) within 3 km, water (52%) within 16 km, and water (39%), trees (29%) and grassland (26%) within 80 km.

3 km
24 m
16 km
139 m
80 km
314 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Moanda 23 km · Cabinda 67 km · Boma 82 km · Matadi 125 km · Tombôco 130 km · N'zeto 134 km · Tshela 142 km · Kenge 148 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 Soyo (-6.1349°, 12.3689°, elevation 10 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).