Viana weather in September
In September, Viana sees average daytime highs of 30°C and overnight lows near 20°C, with 6 mm of rain across 1.4 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 13% of the time in September, and the air most often feels muggy.
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 Viana's 5th-clearest and 2nd-windiest month. For the whole year in context, see Viana's year-round climate.
- Daytime high
- 30°
- 9th warmest
- Overnight low
- 20°
- 4th coldest
- Rainfall
- 6 mm
- 1.4 wet days
- Daylight
- 12 hours
- 6:02 AM – 5:59 PM
- Cloud cover
- 65%
- 5th clearest
- Wind
- 7 km/h
- 2nd windiest
- Solar energy
- 4.45 kWh/m²
- Travel score
- 5.7
- out of 10
Viana is city and municipality of Angola.
- Density
- 8,286/km²
- people per km²
- Founded
- 1963
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 30°C through the month.
A typical September day in Viana reaches about 30°C in the afternoon and slips back to 20°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°C. Set against its neighbours, September runs about 1°C warmer than 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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
| Avg low (°C) | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 19 |
| 2 | 30 | 19 |
| 3 | 30 | 19 |
| 4 | 30 | 19 |
| 5 | 30 | 19 |
| 6 | 30 | 20 |
| 7 | 30 | 20 |
| 8 | 30 | 20 |
| 9 | 30 | 20 |
| 10 | 30 | 20 |
| 11 | 30 | 20 |
| 12 | 30 | 20 |
| 13 | 30 | 20 |
| 14 | 30 | 20 |
| 15 | 30 | 20 |
| 16 | 30 | 20 |
| 17 | 30 | 20 |
| 18 | 30 | 20 |
| 19 | 30 | 20 |
| 20 | 30 | 20 |
| 21 | 30 | 20 |
| 22 | 30 | 20 |
| 23 | 30 | 21 |
| 24 | 31 | 21 |
| 25 | 31 | 21 |
| 26 | 31 | 21 |
| 27 | 31 | 21 |
| 28 | 31 | 21 |
| 29 | 31 | 21 |
| 30 | 31 | 21 |
How September really feels in Viana
Once humidity and wind are folded in, September averages 1 day that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Viana weather by month
How September compares with the rest of the year at a glance. September is the 9th-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 | 32° / 23° | 80 | 11 | 12.5 | 3.5 |
| Feb | 33° / 24° | 81 | 10.6 | 12.3 | 3.2 |
| Mar | 32° / 24° | 122 | 15.5 | 12.1 | 3.1 |
| Apr | 32° / 24° | 142 | 17.4 | 11.8 | 3.3 |
| May | 32° / 22° | 15 | 2.7 | 11.6 | 4.9 |
| Jun | 30° / 20° | 0 | 0 | 11.5 | 6.5 |
| Jul | 29° / 18° | 0 | 0 | 11.5 | 7.2 |
| Aug | 29° / 18° | 2 | 0.3 | 11.7 | 6.8 |
| Sep | 30° / 20° | 6 | 1.4 | 11.9 | 5.7 |
| Oct | 31° / 22° | 18 | 4.3 | 12.2 | 4.9 |
| Nov | 31° / 23° | 78 | 12.5 | 12.4 | 3.8 |
| Dec | 32° / 23° | 80 | 12.5 | 12.5 | 3.7 |
Cloud cover in September
The sky is clear or mostly clear about 13% 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 62%. 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 (%) | 42 | 42 | 42 | 42 | 42 | 40 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 33 | 33 | 33 | 32 | 31 | 30 |
| Cloudier (%) | 58 | 58 | 58 | 58 | 58 | 60 | 60 | 60 | 60 | 60 | 60 | 61 | 61 | 61 | 61 | 61 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 67 | 67 | 67 | 68 | 69 | 70 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 42 | 58 |
| 2 | 42 | 58 |
| 3 | 42 | 58 |
| 4 | 42 | 58 |
| 5 | 42 | 58 |
| 6 | 40 | 60 |
| 7 | 40 | 60 |
| 8 | 40 | 60 |
| 9 | 40 | 60 |
| 10 | 40 | 60 |
| 11 | 40 | 60 |
| 12 | 39 | 61 |
| 13 | 39 | 61 |
| 14 | 39 | 61 |
| 15 | 39 | 61 |
| 16 | 39 | 61 |
| 17 | 37 | 63 |
| 18 | 37 | 63 |
| 19 | 37 | 63 |
| 20 | 36 | 64 |
| 21 | 36 | 64 |
| 22 | 36 | 64 |
| 23 | 35 | 65 |
| 24 | 35 | 65 |
| 25 | 33 | 67 |
| 26 | 33 | 67 |
| 27 | 33 | 67 |
| 28 | 32 | 68 |
| 29 | 31 | 69 |
| 30 | 30 | 70 |
Chance of precipitation in September
Viana gets around 6 mm of rain over 1.4 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 5% and peaks near 6% on the wettest days.
| 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 (%) | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 |
| Rain chance (%) | |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 3 |
| 4 | 3 |
| 5 | 3 |
| 6 | 4 |
| 7 | 4 |
| 8 | 4 |
| 9 | 5 |
| 10 | 5 |
| 11 | 5 |
| 12 | 5 |
| 13 | 6 |
| 14 | 6 |
| 15 | 6 |
| 16 | 6 |
| 17 | 6 |
| 18 | 6 |
| 19 | 6 |
| 20 | 6 |
| 21 | 5 |
| 22 | 5 |
| 23 | 5 |
| 24 | 5 |
| 25 | 5 |
| 26 | 5 |
| 27 | 5 |
| 28 | 6 |
| 29 | 6 |
| 30 | 6 |
Humidity in September
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 52% of days. Sticky, muggy-or-worse air turns up on roughly 52% 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 (%) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | 77 | 76 | 75 | 74 | 72 | 71 | 69 | 67 | 65 | 63 | 61 | 58 | 55 | 53 | 50 | 47 | 44 | 41 | 39 | 36 | 34 | 32 | 30 | 28 | 26 | 24 | 22 | 20 | 18 | 17 |
| Muggy (%) | 22 | 23 | 24 | 25 | 27 | 29 | 31 | 33 | 35 | 37 | 39 | 42 | 45 | 47 | 50 | 53 | 56 | 59 | 61 | 64 | 66 | 68 | 70 | 72 | 74 | 76 | 78 | 80 | 81 | 82 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 1 | 77 | 22 | 0 |
| 2 | 1 | 76 | 23 | 0 |
| 3 | 1 | 75 | 24 | 0 |
| 4 | 1 | 74 | 25 | 0 |
| 5 | 1 | 72 | 27 | 0 |
| 6 | 0 | 71 | 29 | 0 |
| 7 | 0 | 69 | 31 | 0 |
| 8 | 0 | 67 | 33 | 0 |
| 9 | 0 | 65 | 35 | 0 |
| 10 | 0 | 63 | 37 | 0 |
| 11 | 0 | 61 | 39 | 0 |
| 12 | 0 | 58 | 42 | 0 |
| 13 | 0 | 55 | 45 | 0 |
| 14 | 0 | 53 | 47 | 0 |
| 15 | 0 | 50 | 50 | 0 |
| 16 | 0 | 47 | 53 | 0 |
| 17 | 0 | 44 | 56 | 0 |
| 18 | 0 | 41 | 59 | 0 |
| 19 | 0 | 39 | 61 | 0 |
| 20 | 0 | 36 | 64 | 0 |
| 21 | 0 | 34 | 66 | 0 |
| 22 | 0 | 32 | 68 | 0 |
| 23 | 0 | 30 | 70 | 0 |
| 24 | 0 | 28 | 72 | 0 |
| 25 | 0 | 26 | 74 | 0 |
| 26 | 0 | 24 | 76 | 0 |
| 27 | 0 | 22 | 78 | 0 |
| 28 | 0 | 20 | 80 | 0 |
| 29 | 0 | 18 | 81 | 1 |
| 30 | 0 | 17 | 82 | 1 |
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.
| 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) | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 | 6 | calm |
| 2 | 6 | 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 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in September
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 6:11 AM to 5:54 AM, and sunset from 6:01 PM to 5:58 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 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 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) | 6:11 | 6:11 | 6:10 | 6:10 | 6:09 | 6:08 | 6:08 | 6:07 | 6:07 | 6:06 | 6:05 | 6:05 | 6:04 | 6:04 | 6:03 | 6:02 | 6:02 | 6:01 | 6:00 | 6:00 | 5:59 | 5:59 | 5:58 | 5:57 | 5:57 | 5:56 | 5:55 | 5:55 | 5:54 | 5:54 |
| Sunset (PM) | 6:01 | 6:01 | 6:01 | 6:01 | 6:01 | 6:01 | 6:00 | 6:00 | 6:00 | 6:00 | 6:00 | 6:00 | 6:00 | 6:00 | 5:59 | 5:59 | 5:59 | 5:59 | 5:59 | 5:59 | 5:59 | 5:59 | 5:59 | 5:58 | 5:58 | 5:58 | 5:58 | 5:58 | 5:58 | 5:58 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 6:11 | 6:01 |
| 2 | 11.8 | 6:11 | 6:01 |
| 3 | 11.8 | 6:10 | 6:01 |
| 4 | 11.9 | 6:10 | 6:01 |
| 5 | 11.9 | 6:09 | 6:01 |
| 6 | 11.9 | 6:08 | 6:01 |
| 7 | 11.9 | 6:08 | 6:00 |
| 8 | 11.9 | 6:07 | 6:00 |
| 9 | 11.9 | 6:07 | 6:00 |
| 10 | 11.9 | 6:06 | 6:00 |
| 11 | 11.9 | 6:05 | 6:00 |
| 12 | 11.9 | 6:05 | 6:00 |
| 13 | 11.9 | 6:04 | 6:00 |
| 14 | 11.9 | 6:04 | 6:00 |
| 15 | 11.9 | 6:03 | 5:59 |
| 16 | 12.0 | 6:02 | 5:59 |
| 17 | 12.0 | 6:02 | 5:59 |
| 18 | 12.0 | 6:01 | 5:59 |
| 19 | 12.0 | 6:00 | 5:59 |
| 20 | 12.0 | 6:00 | 5:59 |
| 21 | 12.0 | 5:59 | 5:59 |
| 22 | 12.0 | 5:59 | 5:59 |
| 23 | 12.0 | 5:58 | 5:59 |
| 24 | 12.0 | 5:57 | 5:58 |
| 25 | 12.0 | 5:57 | 5:58 |
| 26 | 12.0 | 5:56 | 5:58 |
| 27 | 12.0 | 5:55 | 5:58 |
| 28 | 12.1 | 5:55 | 5:58 |
| 29 | 12.1 | 5:54 | 5:58 |
| 30 | 12.1 | 5:54 | 5:58 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².
For context, solar energy here swings from a low near 4.12 kWh/m² to a high of 5.55 kWh/m² in February across the year — September's 4.45 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) | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 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 | 4.5 | Bright |
| 2 | 4.5 | Bright |
| 3 | 4.5 | Bright |
| 4 | 4.5 | Bright |
| 5 | 4.5 | Bright |
| 6 | 4.5 | Bright |
| 7 | 4.5 | Bright |
| 8 | 4.5 | Bright |
| 9 | 4.5 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.5 | Bright |
| 13 | 4.5 | 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 | 4.5 | Bright |
| 21 | 4.4 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.4 | Bright |
| 24 | 4.4 | Bright |
| 25 | 4.4 | Bright |
| 26 | 4.4 | Bright |
| 27 | 4.4 | Bright |
| 28 | 4.4 | Bright |
| 29 | 4.3 | Bright |
| 30 | 4.3 | Bright |
Hazard calendar for Viana
None of Viana's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Viana's rainy season runs November–April, when most of the year's rain falls.
Is September a good time to visit Viana?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Viana for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Viana in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Viana sees daytime highs around 30°C and nights near 20°C. Pack light clothes.
Sea temperature near Viana in September
The nearest coast averages about 22°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 28 km away) is warmest in March at about 28°C and coldest in August near 20°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 28 | 28 | 27 | 25 | 23 | 21 | 20 | 22 | 24 | 26 | 26 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 28 | Warm |
| Mar | 28 | Warm |
| Apr | 27 | Warm |
| May | 25 | Warm |
| Jun | 23 | Refreshing |
| Jul | 21 | Refreshing |
| Aug | 20 | Refreshing |
| Sep | 22 | Refreshing |
| Oct | 24 | Warm |
| Nov | 26 | Warm |
| Dec | 26 | Warm |
UV index in Viana in September
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 Viana peaks around March 14 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 14 | 15 | 13 | 9 | 7 | 6 | 6 | 10 | 11 | 12 | 12 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 13 | Extreme |
| May | 9 | Very high |
| Jun | 7 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 10 | Very high |
| Oct | 11 | Extreme |
| Nov | 12 | Extreme |
| Dec | 12 | Extreme |
Air quality in Viana in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Viana is worst in July — around 47 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (January, 23 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) | 23 | 24 | 29 | 34 | 35 | 41 | 47 | 43 | 32 | 27 | 25 | 26 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 23 | Moderate |
| Feb | 24 | Moderate |
| Mar | 29 | Moderate |
| Apr | 34 | Moderate |
| May | 35 | Moderate |
| Jun | 41 | Poor |
| Jul | 47 | Poor |
| Aug | 43 | Poor |
| Sep | 32 | Moderate |
| Oct | 27 | Moderate |
| Nov | 25 | Moderate |
| Dec | 26 | Moderate |
Where is Viana?
Viana sits at 8.9°S, 13.4°E, 128 m above sea level, in Angola. The nearest listed city is Mulenvos, 6.0 km away.
Topography around Viana
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Viana.
Within 3 km, the terrain around Viana has only modest variations in elevation — a maximum elevation change of 69 m around an average of 121 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 165 m; within 80 km, significant variations in elevation — a maximum elevation change of 585 m.
The land around Viana is covered by artificial surfaces (87%) within 3 km, artificial surfaces (53%) and grassland (42%) within 16 km, and water (33%), grassland (29%) and trees (28%) within 80 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 Viana (-8.9055°, 13.375°, elevation 128 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).