Calai fire, 18 August 2026 Calai
The fire started on 18 August 2026 in Calai, Angola, and satellites saw it burning for 20 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 12,328 hectares from heat detections, spread across a single municipality.
It is the 125th largest in Cuando Cubango since 2016 (of 660 with a page). Number 123 in Angola in 2026, of 487.
Compare with…
Suggestions: Calai · 2018Calai · 2017Calai · 2019Calai · 2021
- Burnt area
- 12,328ha
- GWIS perimeter (Copernicus)
- Duration
- 20days
- 18 Aug 2026 – 6 Sept 2026
- Municipalities hit
- 1
- municipalities
- Started on
- 18 Aug
- 2026
- Heat detections
- 255
- in a single hotspot: 112 MW
- Danger at start
- 51
- Extreme · FWI index
- Average daily power
- 147MW
- detected power per day, on average
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
95% of the perimeter overlaps earlier fires recorded since 2016: 2,447 ha in 2016, 3,559 ha in 2017, 3,055 ha in 2018, 3,033 ha in 2019, 142 ha in 2020, 3,605 ha in 2021, 3,532 ha in 2022, 2,270 ha in 2023, 4,454 ha in 2024, 1,015 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 11,658 ha that had burned before.
- 3,055 ha Calai fire, September 2018 8,183 ha in total; the hectares shown are those it shares with this fire
- 1,247 ha Calai fire, August 2017 9,144 ha in total; the hectares shown are those it shares with this fire
- 904 ha Calai fire, August 2019 5,622 ha in total; the hectares shown are those it shares with this fire
- 838 ha Calai fire, September 2021 10,800 ha in total; the hectares shown are those it shares with this fire
- 426 ha Calai fire, October 2024 13,050 ha in total; the hectares shown are those it shares with this fire
- 360 ha Calai fire, August 2023 5,988 ha in total; the hectares shown are those it shares with this fire
- 228 ha Calai fire, September 2016 6,844 ha in total; the hectares shown are those it shares with this fire
- 17 ha Calai fire, August 2022 6,879 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Calai where it started12,386 ha reached on 18 Aug1.6 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.
People and buildings inside the perimeter
GHSL 2025Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).
This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu
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) |
|---|---|---|---|---|---|
| 18 Aug | 30.2 °C | 11 % | 37 km/h | 0.0 mm | Extreme 51 |
| 19 Aug | 31.5 °C | 8 % | 45 km/h | 0.0 mm | Extreme 60 |
| 20 Aug | 31.8 °C | 11 % | 45 km/h | 0.0 mm | Extreme 61 |
| 21 Aug | 30.7 °C | 14 % | 47 km/h | 0.0 mm | Extreme 63 |
| 22 Aug | 30.8 °C | 13 % | 37 km/h | 0.0 mm | Extreme 56 |
| 23 Aug | 32.1 °C | 16 % | 48 km/h | 0.0 mm | Extreme 64 |
| 24 Aug | 32.5 °C | 13 % | 44 km/h | 0.0 mm | Extreme 62 |
| 25 Aug | 31.8 °C | 14 % | 40 km/h | 0.0 mm | Extreme 57 |
| 26 Aug | 32.1 °C | 13 % | 40 km/h | 0.0 mm | Extreme 58 |
| 27 Aug | 32.2 °C | 13 % | 42 km/h | 0.0 mm | Extreme 61 |
| 28 Aug | 30.3 °C | 14 % | 48 km/h | 0.0 mm | Extreme 63 |
| 29 Aug | 29.9 °C | 14 % | 42 km/h | 0.0 mm | Extreme 58 |
| 30 Aug | 32.0 °C | 11 % | 38 km/h | 0.0 mm | Extreme 56 |
| 31 Aug | 33.7 °C | 17 % | 36 km/h | 0.0 mm | Extreme 53 |
| 1 Sept | 34.4 °C | 14 % | 42 km/h | 0.0 mm | Extreme 58 |
| 2 Sept | 33.7 °C | 14 % | 34 km/h | 0.0 mm | Extreme 52 |
| 3 Sept | 34.8 °C | 13 % | 37 km/h | 0.0 mm | Extreme 56 |
| 4 Sept | 33.1 °C | 8 % | 38 km/h | 0.0 mm | Extreme 57 |
| 5 Sept | 31.5 °C | 9 % | 28 km/h | 0.0 mm | Extreme 51 |
| 6 Sept | 32.9 °C | 13 % | 19 km/h | 0.0 mm | Very high 50 |
| 7 Sept after | 34.4 °C | 17 % | 32 km/h | 0.0 mm | Extreme 53 |
| 8 Sept after | 33.7 °C | 20 % | 49 km/h | 0.0 mm | Extreme 61 |
| 9 Sept after | 31.3 °C | 22 % | 55 km/h | 0.0 mm | Extreme 62 |
| 10 Sept after | 30.6 °C | 20 % | 46 km/h | 0.0 mm | Extreme 55 |
| 11 Sept after | 31.8 °C | 16 % | 42 km/h | 0.0 mm | Extreme 53 |
| 12 Sept after | 33.8 °C | 13 % | 41 km/h | 0.0 mm | Extreme 55 |
| 13 Sept after | 35.4 °C | 16 % | 42 km/h | 0.0 mm | Extreme 56 |
| 14 Sept after | 33.4 °C | 22 % | 43 km/h | 0.0 mm | Extreme 54 |
| 15 Sept after | 35.5 °C | 16 % | 25 km/h | 0.0 mm | Very high 46 |
| 16 Sept after | 36.4 °C | 17 % | 35 km/h | 0.0 mm | Very high 49 |
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 29 August 2026 the air beside the fire reached 79 µg/m³ of PM2.5. That day averaged 40: 2.7 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 · 255Every 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 18 August 2026 and 6 September 2026: 20 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 12,328 hectares (123.3 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Calai (12,386 ha, 1.6 %).
- What was the weather like?
- During the fire the temperature reached 34.8 °C, humidity dropped to 8 % and gusts hit 48 km/h. The fire danger index (FWI) reached 64, 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
History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
No changes since 24 October 2026.
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
How we know this
- Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery; 2 polygons grouped in this page.
- Dates from the perimeter: the VIIRS detections inside it did not change them. 255 Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
- Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
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.