Piri weather in September

In September, Piri sees average daytime highs of 28°C and overnight lows near 18°C, with 17 mm of rain across 5.5 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 13% 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 Piri's 5th-clearest and 1st-windiest month. For the whole year in context, see Piri's year-round climate.

Daytime high: 28°; 8th warmest
Overnight low: 18°; 4th coldest
Rainfall: 17 mm; 5.5 wet days
Daylight: 12 hours; 5:58 AM – 5:55 PM
Cloud cover: 66%; 5th clearest
Wind: 7 km/h; 1st windiest
Solar energy: 4.51 kWh/m²
Travel score: 6.8; out of 10

Piri is town and commune in the municipality of Dembos, province of Bengo, Angola.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Piri year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Piri reaches about 28°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19

	Avg high (°C)	Avg low (°C)
1	28	18
2	28	18
3	28	18
4	28	18
5	28	18
6	28	18
7	28	18
8	28	18
9	28	18
10	28	18
11	28	18
12	28	18
13	28	18
14	28	18
15	28	18
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	28	19
30	28	19

Piri weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 21°	133	17.9	12.4	4.7
Feb	29° / 21°	130	15.7	12.3	4.4
Mar	29° / 21°	196	21.7	12.1	3.8
Apr	29° / 21°	276	26.8	11.8	3.3
May	28° / 20°	56	9.7	11.6	6.1
Jun	28° / 17°	2	0.3	11.5	8.4
Jul	27° / 16°	1	0.1	11.6	8.5
Aug	27° / 17°	5	1.3	11.7	8.0
Sep	28° / 18°	17	5.5	11.9	6.8
Oct	28° / 20°	77	16.1	12.2	5.2
Nov	28° / 21°	215	23.6	12.4	4.1
Dec	28° / 21°	175	21.4	12.5	4.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	52	50	49	48	46	46	45	43	41	41	39	38	38	37	36	35	34	33	31	31	30	28	27	26	26	25	23	22	21	20
Cloudier (%)	48	50	51	52	54	54	55	57	59	59	61	62	62	63	64	65	66	67	69	69	70	72	73	74	74	75	77	78	79	80

	Clearer (%)	Cloudier (%)
1	52	48
2	50	50
3	49	51
4	48	52
5	46	54
6	46	54
7	45	55
8	43	57
9	41	59
10	41	59
11	39	61
12	38	62
13	38	62
14	37	63
15	36	64
16	35	65
17	34	66
18	33	67
19	31	69
20	31	69
21	30	70
22	28	72
23	27	73
24	26	74
25	26	74
26	25	75
27	23	77
28	22	78
29	21	79
30	20	80

Chance of precipitation in September

Any precipitation

Piri gets around 17 mm of rain over 5.5 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 18% and peaks near 27% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	9	9	10	10	11	12	13	13	14	15	16	17	18	19	19	20	21	21	22	22	22	23	23	23	24	24	25	25	26	27

	Rain chance (%)
1	9
2	9
3	10
4	10
5	11
6	12
7	13
8	13
9	14
10	15
11	16
12	17
13	18
14	19
15	19
16	20
17	21
18	21
19	22
20	22
21	22
22	23
23	23
24	23
25	24
26	24
27	25
28	25
29	26
30	27

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 80% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Comfortable (%)	24	22	20	19	17	15	13	12	10	9	8	7	6	5	4	3	3	2	2	1	1	1	1	1	0	0	0	0	0	0
Humid (%)	74	76	78	78	80	82	84	84	85	86	86	86	86	86	86	86	84	84	83	83	82	80	79	77	77	75	73	70	68	65
Muggy (%)	2	2	2	3	3	3	3	4	5	5	6	7	8	9	10	11	13	14	15	16	17	19	20	22	23	25	27	30	32	35

	Comfortable (%)	Humid (%)	Muggy (%)
1	24	74	2
2	22	76	2
3	20	78	2
4	19	78	3
5	17	80	3
6	15	82	3
7	13	84	3
8	12	84	4
9	10	85	5
10	9	86	5
11	8	86	6
12	7	86	7
13	6	86	8
14	5	86	9
15	4	86	10
16	3	86	11
17	3	84	13
18	2	84	14
19	2	83	15
20	1	83	16
21	1	82	17
22	1	80	19
23	1	79	20
24	1	77	22
25	0	77	23
26	0	75	25
27	0	73	27
28	0	70	30
29	0	68	32
30	0	65	35

Wind in September

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm

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 6:07 AM to 5:50 AM, and sunset from 5:57 PM to 5:54 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.8	11.8	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.1	12.1	12.1
Sunrise (AM)	6:07	6:06	6:06	6:05	6:05	6:04	6:03	6:03	6:02	6:02	6:01	6:00	6:00	5:59	5:59	5:58	5:57	5:57	5:56	5:56	5:55	5:54	5:54	5:53	5:52	5:52	5:51	5:51	5:50	5:50
Sunset (PM)	5:57	5:57	5:57	5:57	5:57	5:56	5:56	5:56	5:56	5:56	5:56	5:56	5:56	5:55	5:55	5:55	5:55	5:55	5:55	5:55	5:55	5:54	5:54	5:54	5:54	5:54	5:54	5:54	5:54	5:54

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.8	6:07	5:57
2	11.8	6:06	5:57
3	11.9	6:06	5:57
4	11.9	6:05	5:57
5	11.9	6:05	5:57
6	11.9	6:04	5:56
7	11.9	6:03	5:56
8	11.9	6:03	5:56
9	11.9	6:02	5:56
10	11.9	6:02	5:56
11	11.9	6:01	5:56
12	11.9	6:00	5:56
13	11.9	6:00	5:56
14	11.9	5:59	5:55
15	11.9	5:59	5:55
16	12.0	5:58	5:55
17	12.0	5:57	5:55
18	12.0	5:57	5:55
19	12.0	5:56	5:55
20	12.0	5:56	5:55
21	12.0	5:55	5:55
22	12.0	5:54	5:54
23	12.0	5:54	5:54
24	12.0	5:53	5:54
25	12.0	5:52	5:54
26	12.0	5:52	5:54
27	12.0	5:51	5:54
28	12.1	5:51	5:54
29	12.1	5:50	5:54
30	12.1	5:50	5:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.51 kWh/m².

For context, solar energy here swings from a low near 4.19 kWh/m² to a high of 5.42 kWh/m² in February across the year — September's 4.51 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.7	4.7	4.7	4.7	4.7	4.7	4.6	4.6	4.6	4.6	4.6	4.6	4.6	4.5	4.5	4.5	4.5	4.5	4.5	4.4	4.4	4.4	4.4	4.4	4.3	4.3	4.3	4.3	4.3	4.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.7	Bright
2	4.7	Bright
3	4.7	Bright
4	4.7	Bright
5	4.7	Bright
6	4.7	Bright
7	4.6	Bright
8	4.6	Bright
9	4.6	Bright
10	4.6	Bright
11	4.6	Bright
12	4.6	Bright
13	4.6	Bright
14	4.5	Bright
15	4.5	Bright
16	4.5	Bright
17	4.5	Bright
18	4.5	Bright
19	4.5	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.4	Bright
25	4.3	Bright
26	4.3	Bright
27	4.3	Bright
28	4.3	Bright
29	4.3	Bright
30	4.3	Bright

Planning a trip in September

Hazard calendar for Piri

In seasonPeak

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

Piri'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 Piri?

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

6.8

Sightseeing

4th-best month of the year

7.2

Beach & pool

4th-best month of the year

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

What to pack for Piri in September

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

In September, Piri sees daytime highs around 28°C and nights near 18°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Piri 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 Piri peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 13 at about 6 (high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	15	14	15	13	9	8	7	6	10	13	12	12
Level	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	High	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	14	Extreme
Mar	15	Extreme
Apr	13	Extreme
May	9	Very high
Jun	8	Very high
Jul	7	Very high
Aug	6	High
Sep	10	Very high
Oct	13	Extreme
Nov	12	Extreme
Dec	12	Extreme

Air quality in Piri 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 Piri is worst in September — around 57 µg/m³ PM2.5 (unhealthy), about 2.3× the cleanest month (January, 24 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	24	26	29	30	39	55	56	51	57	38	25	26
Level	Moderate	Moderate	Moderate	Moderate	Poor	Poor	Unhealthy	Poor	Unhealthy	Poor	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	24	Moderate
Feb	26	Moderate
Mar	29	Moderate
Apr	30	Moderate
May	39	Poor
Jun	55	Poor
Jul	56	Unhealthy
Aug	51	Poor
Sep	57	Unhealthy
Oct	38	Poor
Nov	25	Moderate
Dec	26	Moderate

Location & terrain

Where is Piri?

Piri sits at 8.5°S, 14.4°E, 695 m above sea level, in Angola. The nearest listed city is Pango Aluquém, 20 km away.

Topography around Piri

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

Within 3 km, the terrain around Piri has significant variations in elevation — a maximum elevation change of 319 m around an average of 692 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 752 m; within 80 km, large variations in elevation — a maximum elevation change of 1,116 m.

The land around Piri is covered by trees (94%) within 3 km, trees (94%) within 16 km, and trees (78%) and grassland (20%) within 80 km.

3 km

319 m

trees 94%

16 km

752 m

trees 94%

80 km

1,116 m

trees 78%

treesshrubsgrasslandartificial surfaces

← August Piri year-round climate October →Best places to visit in September

September weather nearby: Pango Aluquém 20 km · Cage Mazumbo 28 km · Úcua 33 km · Bula Atumba 43 km · Gombe 48 km · Muxaluando 48 km · Canacassala 54 km · Golungo Alto 76 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

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 Piri (-8.5341°, 14.4355°, elevation 695 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).

	Avg high (°C)	Avg low (°C)
1	28	18
2	28	18
3	28	18
4	28	18
5	28	18
6	28	18
7	28	18
8	28	18
9	28	18
10	28	18
11	28	18
12	28	18
13	28	18
14	28	18
15	28	18
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	28	19
30	28	19

	Clearer (%)	Cloudier (%)
1	52	48
2	50	50
3	49	51
4	48	52
5	46	54
6	46	54
7	45	55
8	43	57
9	41	59
10	41	59
11	39	61
12	38	62
13	38	62
14	37	63
15	36	64
16	35	65
17	34	66
18	33	67
19	31	69
20	31	69
21	30	70
22	28	72
23	27	73
24	26	74
25	26	74
26	25	75
27	23	77
28	22	78
29	21	79
30	20	80

	Rain chance (%)
1	9
2	9
3	10
4	10
5	11
6	12
7	13
8	13
9	14
10	15
11	16
12	17
13	18
14	19
15	19
16	20
17	21
18	21
19	22
20	22
21	22
22	23
23	23
24	23
25	24
26	24
27	25
28	25
29	26
30	27

	Comfortable (%)	Humid (%)	Muggy (%)
1	24	74	2
2	22	76	2
3	20	78	2
4	19	78	3
5	17	80	3
6	15	82	3
7	13	84	3
8	12	84	4
9	10	85	5
10	9	86	5
11	8	86	6
12	7	86	7
13	6	86	8
14	5	86	9
15	4	86	10
16	3	86	11
17	3	84	13
18	2	84	14
19	2	83	15
20	1	83	16
21	1	82	17
22	1	80	19
23	1	79	20
24	1	77	22
25	0	77	23
26	0	75	25
27	0	73	27
28	0	70	30
29	0	68	32
30	0	65	35

	Avg high (°C)	Avg low (°C)
1	28	18
2	28	18
3	28	18
4	28	18
5	28	18
6	28	18
7	28	18
8	28	18
9	28	18
10	28	18
11	28	18
12	28	18
13	28	18
14	28	18
15	28	18
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	28	19
30	28	19

	Clearer (%)	Cloudier (%)
1	52	48
2	50	50
3	49	51
4	48	52
5	46	54
6	46	54
7	45	55
8	43	57
9	41	59
10	41	59
11	39	61
12	38	62
13	38	62
14	37	63
15	36	64
16	35	65
17	34	66
18	33	67
19	31	69
20	31	69
21	30	70
22	28	72
23	27	73
24	26	74
25	26	74
26	25	75
27	23	77
28	22	78
29	21	79
30	20	80

	Rain chance (%)
1	9
2	9
3	10
4	10
5	11
6	12
7	13
8	13
9	14
10	15
11	16
12	17
13	18
14	19
15	19
16	20
17	21
18	21
19	22
20	22
21	22
22	23
23	23
24	23
25	24
26	24
27	25
28	25
29	26
30	27

	Comfortable (%)	Humid (%)	Muggy (%)
1	24	74	2
2	22	76	2
3	20	78	2
4	19	78	3
5	17	80	3
6	15	82	3
7	13	84	3
8	12	84	4
9	10	85	5
10	9	86	5
11	8	86	6
12	7	86	7
13	6	86	8
14	5	86	9
15	4	86	10
16	3	86	11
17	3	84	13
18	2	84	14
19	2	83	15
20	1	83	16
21	1	82	17
22	1	80	19
23	1	79	20
24	1	77	22
25	0	77	23
26	0	75	25
27	0	73	27
28	0	70	30
29	0	68	32
30	0	65	35

	Avg high (°C)	Avg low (°C)
1	28	18
2	28	18
3	28	18
4	28	18
5	28	18
6	28	18
7	28	18
8	28	18
9	28	18
10	28	18
11	28	18
12	28	18
13	28	18
14	28	18
15	28	18
16	28	19
17	28	19
18	28	19
19	28	19
20	28	19
21	28	19
22	28	19
23	28	19
24	28	19
25	28	19
26	28	19
27	28	19
28	28	19
29	28	19
30	28	19

	Clearer (%)	Cloudier (%)
1	52	48
2	50	50
3	49	51
4	48	52
5	46	54
6	46	54
7	45	55
8	43	57
9	41	59
10	41	59
11	39	61
12	38	62
13	38	62
14	37	63
15	36	64
16	35	65
17	34	66
18	33	67
19	31	69
20	31	69
21	30	70
22	28	72
23	27	73
24	26	74
25	26	74
26	25	75
27	23	77
28	22	78
29	21	79
30	20	80

	Rain chance (%)
1	9
2	9
3	10
4	10
5	11
6	12
7	13
8	13
9	14
10	15
11	16
12	17
13	18
14	19
15	19
16	20
17	21
18	21
19	22
20	22
21	22
22	23
23	23
24	23
25	24
26	24
27	25
28	25
29	26
30	27

	Comfortable (%)	Humid (%)	Muggy (%)
1	24	74	2
2	22	76	2
3	20	78	2
4	19	78	3
5	17	80	3
6	15	82	3
7	13	84	3
8	12	84	4
9	10	85	5
10	9	86	5
11	8	86	6
12	7	86	7
13	6	86	8
14	5	86	9
15	4	86	10
16	3	86	11
17	3	84	13
18	2	84	14
19	2	83	15
20	1	83	16
21	1	82	17
22	1	80	19
23	1	79	20
24	1	77	22
25	0	77	23
26	0	75	25
27	0	73	27
28	0	70	30
29	0	68	32
30	0	65	35