Calai fire, 6 August 2026 Calai
The fire started on 6 August 2026 in Calai, Angola, and satellites saw it burning for 10 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 9,231 hectares from heat detections, spread across a single municipality.
It is the 223th largest in Cuando Cubango since 2016 (of 659 with a page). Number 179 in Angola in 2026, of 486.
- Burnt area
- 9,231ha
- GWIS perimeter (Copernicus)
- Duration
- 10days
- 6 Aug 2026 – 15 Aug 2026
- Municipalities hit
- 1
- municipalities
- Started on
- 6 Aug
- 2026
- Heat detections
- 130
- in a single hotspot: 178 MW
- Danger at start
- 52
- Extreme · FWI index
- Energy released
- 2.3GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
87% of the perimeter overlaps earlier fires recorded since 2016: 2,691 ha in 2017, 344 ha in 2018, 4,092 ha in 2019, 2,138 ha in 2021, 2,334 ha in 2023, 4,288 ha in 2024, 243 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 8,051 ha that had burned before.
What happened to each town
-
Calai where it started9,272 ha reached on 6 Aug1.2 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 6 Aug | 29.7 °C | 12 % | 37 km/h | 0.0 mm | Extreme 52 |
| 7 Aug | 28.7 °C | 13 % | 36 km/h | 0.0 mm | Extreme 52 |
| 8 Aug | 28.1 °C | 13 % | 36 km/h | 0.0 mm | Extreme 53 |
| 9 Aug | 29.0 °C | 11 % | 26 km/h | 0.0 mm | Very high 47 |
| 10 Aug | 28.9 °C | 13 % | 32 km/h | 0.0 mm | Extreme 55 |
| 11 Aug | 25.2 °C | 14 % | 39 km/h | 0.0 mm | Extreme 54 |
| 12 Aug | 27.6 °C | 11 % | 36 km/h | 0.0 mm | Extreme 51 |
| 13 Aug | 29.0 °C | 19 % | 39 km/h | 0.0 mm | Extreme 51 |
| 14 Aug | 28.2 °C | 24 % | 38 km/h | 0.0 mm | Very high 46 |
| 15 Aug | 27.4 °C | 27 % | 38 km/h | 0.0 mm | Very high 43 |
| 16 Aug after | 27.0 °C | 19 % | 42 km/h | 0.0 mm | Very high 46 |
| 17 Aug after | 28.2 °C | 14 % | 40 km/h | 0.0 mm | Very high 48 |
| 18 Aug after | 29.9 °C | 12 % | 37 km/h | 0.0 mm | Very high 50 |
| 19 Aug after | 31.2 °C | 9 % | 44 km/h | 0.0 mm | Extreme 57 |
| 20 Aug after | 31.6 °C | 12 % | 45 km/h | 0.0 mm | Extreme 59 |
| 21 Aug after | 30.5 °C | 15 % | 46 km/h | 0.0 mm | Extreme 61 |
| 22 Aug after | 30.5 °C | 13 % | 37 km/h | 0.0 mm | Extreme 54 |
| 23 Aug after | 31.9 °C | 17 % | 48 km/h | 0.0 mm | Extreme 62 |
| 24 Aug after | 32.3 °C | 13 % | 44 km/h | 0.0 mm | Extreme 61 |
| 25 Aug after | 31.7 °C | 14 % | 40 km/h | 0.0 mm | Extreme 56 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 8 August 2026 the air beside the fire reached 45 µg/m³ of PM2.5. That day averaged 32: 2.1 times the WHO daily guideline (15).
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 130Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Calai fire last?
- GWIS (Copernicus) dates it between 6 August 2026 and 15 August 2026: 10 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 9,231 hectares (92.3 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Calai (9,272 ha, 1.2 %).
- What was the weather like?
- During the fire the temperature reached 29.7 °C, humidity dropped to 11 % and gusts hit 39 km/h. The fire danger index (FWI) reached 55, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Angola (geoBoundaries). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Satellite cross-check
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Public Domain). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.