Calulo weather in September

In September, Calulo sees average daytime highs of 27°C and overnight lows near 16°C, with 40 mm of rain across 10.3 wet days and about 11.9 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Calulo's 5th-clearest and 1st-windiest month. For the whole year in context, see Calulo's year-round climate.

Daytime high
27°
6th warmest
Overnight low
16°
4th coldest
Rainfall
40 mm
10.3 wet days
Daylight
11 h 54 min
5:56 AM – 5:53 PM
Cloud cover
47%
5th clearest
Wind
6 km/h
1st windiest
Solar energy
5.62 kWh/m²
Travel score
6.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Calulo reaches about 27°C in the afternoon and slips back to 16°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12715
22715
32715
42715
52715
62715
72715
82716
92716
102716
112716
122716
132716
142716
152716
162716
172716
182716
192716
202716
212716
222716
232717
242717
252717
262717
272717
282717
292717
302717

Calulo weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°11716.312.55.4
Feb27° / 18°1201512.35.2
Mar27° / 18°24523.412.14.3
Apr28° / 19°23723.711.84.2
May28° / 18°37711.56.6
Jun28° / 15°20.411.48.6
Jul28° / 14°0011.58.7
Aug27° / 14°51.311.78.4
Sep27° / 16°4010.311.96.6
Oct26° / 18°14322.612.24.6
Nov26° / 18°25626.412.53.9
Dec25° / 18°17521.312.64.8

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 25% of September, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38218
48218
58218
68119
78119
88020
97921
107921
117822
127822
137624
147525
157426
167327
177129
186931
196733
206535
216337
226139
235941
245743
255545
265347
275149
284951
294852
304654

Chance of precipitation in September

Any precipitation

Calulo gets around 40 mm of rain over 10.3 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 34% and peaks near 56% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
113
213
314
415
516
617
718
820
921
1023
1125
1227
1329
1431
1534
1636
1738
1840
1942
2043
2145
2247
2349
2450
2551
2652
2753
2854
2955
3056

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1578170
2577180
3477190
4475210
5474220
6373240
7372250
8370270
9268300
10266320
11263350
12260380
13256420
14154450
15149490
16145540
17142570
18138610
19035650
20032680
21029710
22026731
23023761
24021781
25018802
26016822
27015823
28013834
29012835
30011827

Wind in September

Winds average 6 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 6 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
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 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 18 minutes over September. Sunrise moves from 6:06 AM to 5:47 AM, and sunset from 5:54 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:065:54
211.86:055:54
311.86:055:54
411.86:045:54
511.86:035:54
611.96:035:54
711.96:025:54
811.96:025:54
911.96:015:54
1011.96:005:54
1111.96:005:54
1211.95:595:53
1311.95:585:53
1411.95:585:53
1511.95:575:53
1611.95:565:53
1712.05:565:53
1812.05:555:53
1912.05:545:53
2012.05:545:53
2112.05:535:53
2212.05:525:53
2312.05:525:53
2412.05:515:52
2512.05:515:52
2612.05:505:52
2712.05:495:52
2812.15:495:52
2912.15:485:52
3012.15:475:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.62 kWh/m².

For context, solar energy here swings from a low near 4.93 kWh/m² to a high of 5.81 kWh/m² in February across the year — September's 5.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.4Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in September

Hazard calendar for Calulo

In seasonPeak

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

Calulo's rainy season runs October–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 Calulo?

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

6.6
Sightseeing
4th-best month of the year
6.8
Beach & pool
5th-best month of the year

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

What to pack for Calulo in September

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

In September, Calulo sees daytime highs around 27°C and nights near 16°C. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Calulo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Calulo peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 16 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 14UV 15Aug 16UV 7
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar16Extreme
Apr13Extreme
May10Very high
Jun8Very high
Jul8Very high
Aug7Very high
Sep8Very high
Oct12Extreme
Nov13Extreme
Dec13Extreme

Air quality in Calulo 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 Calulo is worst in July — around 171 µg/m³ PM2.5 (very unhealthy), about 13.1× the cleanest month (December, 13 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyVery unhealthyUnhealthyModerateJul 12166 µg/m³Dec 1413 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar14Moderate
Apr14Moderate
May27Moderate
Jun146Unhealthy
Jul171Very unhealthy
Aug69Unhealthy
Sep67Unhealthy
Oct35Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Calulo?

Calulo sits at 10.0°S, 14.9°E, 995 m above sea level, in Angola. The nearest listed city is Dondo, 62 km away.

LucalaGolungo AltoGabelaCacuso

Topography around Calulo

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

Within 3 km, the terrain around Calulo has significant variations in elevation — a maximum elevation change of 254 m around an average of 987 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,080 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,972 m.

The land around Calulo is covered by grassland (61%) within 3 km, grassland (44%), trees (31%) and shrubs (23%) within 16 km, and grassland (56%) and trees (31%) within 80 km.

3 km
254 m
16 km
1,080 m
80 km
1,972 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Dondo 62 km · Santa Clara 63 km · N'dalatando 78 km · Quibala 82 km · Lucala 90 km · Golungo Alto 97 km · Gabela 110 km · Cacuso 113 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 Calulo (-10.0006°, 14.8952°, elevation 995 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).