Climate averages 1991–2020
Viana weather
in September.
A hot, very dry month: the 10th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Viana: daytime highs average 29.9°C and nights cool to about 20.4°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 4.4 mm of rain on roughly 1 day, which makes September a very dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 03 min on an average September day.
The nearest other city in this atlas is Mulenvos (6 km away). In September its highs average 29.2°C, 0.7°C cooler than Viana, with 3.0 mm of rain.
Among the 47 cities listed in Angola, Viana ranks 19th of 47 for the warmest September highs and joint 16th of 47 for the driest September (rainfall, lowest first). The mean September high of those 47 cities is 29.0°C; Viana is 0.9°C warmer than that mean.
From September to October, average highs rise by 0.5°C to 30.4°C, and monthly rainfall rises from 4.4 mm to 16 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Viana climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.9°C23.2°C | 23.2°C | 48 | 8.5 | 12.613 h |
| February | 32.4°C23.7°C | 23.7°C | 52 | 9.2 | 12.412 h |
| March | 32.0°C24.0°C | 24.0°C | 89 | 14.8 | 12.212 h |
| April | 30.9°C24.0°C | 24.0°C | 117 | 16.4 | 11.912 h |
| May | 31.8°C22.7°C | 22.7°C | 9.7 | 1.9 | 11.712 h |
| June | 30.3°C19.8°C | 19.8°C | 0.2 | 0.0 | 11.612 h |
| July | 29.0°C18.2°C | 18.2°C | 0.1 | 0.0 | 11.712 h |
| August | 28.9°C18.7°C | 18.7°C | 1.3 | 0.1 | 11.812 h |
| September, selected | 29.9°C20.4°C | 20.4°C | 4.4 | 1.2 | 12.012 h |
| October | 30.4°C22.0°C | 22.0°C | 16 | 3.6 | 12.312 h |
| November | 30.9°C23.0°C | 23.0°C | 48 | 10.6 | 12.513 h |
| December | 31.3°C23.1°C | 23.1°C | 41 | 9.7 | 12.613 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Mulenvos in SeptemberAngola · 6 kmHigh 29.2°C · Low 20.5°C · 3.0 mm rain
- Vila Flor in SeptemberAngola · 11 kmHigh 29.3°C · Low 20.3°C · 4.4 mm rain
- Zango in SeptemberAngola · 12 kmHigh 30.1°C · Low 20.2°C · 6.0 mm rain
- Cacuaco in SeptemberAngola · 14 kmHigh 29.6°C · Low 21.0°C · 3.0 mm rain
- Kikolo in SeptemberAngola · 15 kmHigh 28.6°C · Low 19.9°C · 3.0 mm rain
- Luanda in SeptemberAngola · 17 kmHigh 28.2°C · Low 20.4°C · 3.0 mm rain
- Panguíla in SeptemberAngola · 25 kmHigh 28.5°C · Low 20.9°C · 6.3 mm rain
- Calumbo in SeptemberAngola · 27 kmHigh 31.0°C · Low 20.7°C · 5.5 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Viana) is explained once on the Viana year overview and on the Sources, method and limits page.
Vila Flor lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.