Derre fire, 23 August 2026 Derre, Morrumbala
The fire started on 23 August 2026 in Derre, Mozambique, and satellites saw it burning for 16 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 7,924 hectares from heat detections, spread across 2 municipalities.
It is the 211th largest in Zambézia since 2016 (of 842 with a page). Number 113 in Mozambique in 2026, of 532.
- Burnt area
- 7,924ha
- GWIS perimeter (Copernicus)
- Duration
- 16days
- 23 Aug 2026 – 7 Sept 2026
- Municipalities hit
- 2
- districts
- Started on
- 23 Aug
- 2026
- Heat detections
- 207
- in a single hotspot: 53 MW
- Danger at start
- 39
- Very high · FWI index
- Energy released
- 2.0GW
- 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 3 days without rain (1 mm or more) when it started. Rain came after the fire: 1.3 mm on 8 Sept.
This area had burned before
55% of the perimeter overlaps earlier fires recorded since 2016: 146 ha in 2018, 744 ha in 2019, 180 ha in 2020, 65 ha in 2022, 9 ha in 2023, 1,863 ha in 2024, 2,511 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 4,320 ha that had burned before.
What happened to each town
-
Derre where it started5,334 ha reached on 23 Aug1.1 %
-
2,634 ha reached on 23 Aug0.3 %
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) |
|---|---|---|---|---|---|
| 23 Aug | 32.8 °C | 19 % | 37 km/h | 0.0 mm | Very high 39 |
| 24 Aug | 27.5 °C | 40 % | 36 km/h | 0.5 mm | High 29 |
| 25 Aug | 28.1 °C | 39 % | 26 km/h | 0.2 mm | High 27 |
| 26 Aug | 29.7 °C | 38 % | 38 km/h | 0.0 mm | High 32 |
| 27 Aug | 26.3 °C | 43 % | 40 km/h | 0.3 mm | High 28 |
| 28 Aug | 25.9 °C | 50 % | 32 km/h | 3.1 mm | Low 7 |
| 29 Aug | 26.8 °C | 47 % | 29 km/h | 0.0 mm | Moderate 12 |
| 30 Aug | 31.5 °C | 32 % | 32 km/h | 0.0 mm | High 26 |
| 31 Aug | 33.2 °C | 23 % | 37 km/h | 0.0 mm | High 36 |
| 1 Sept | 31.8 °C | 28 % | 38 km/h | 0.0 mm | High 36 |
| 2 Sept | 32.0 °C | 26 % | 38 km/h | 0.0 mm | High 36 |
| 3 Sept | 33.0 °C | 25 % | 34 km/h | 0.0 mm | High 33 |
| 4 Sept | 34.7 °C | 22 % | 42 km/h | 0.0 mm | Very high 40 |
| 5 Sept | 32.7 °C | 33 % | 45 km/h | 0.0 mm | Very high 40 |
| 6 Sept | 30.8 °C | 37 % | 40 km/h | 0.0 mm | High 34 |
| 7 Sept | 29.0 °C | 37 % | 45 km/h | 0.1 mm | High 34 |
| 8 Sept after | 23.2 °C | 58 % | 45 km/h | 1.3 mm | Moderate 14 |
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 4 September 2026 the air beside the fire reached 108 µg/m³ of PM2.5. That day averaged 57: 3.8 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 · 207Every 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 Derre fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 23 August 2026 to 7 September 2026 (16 days). The perimeter dates it from 30 August 2026 to 7 September 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 7,924 hectares (79.2 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Derre (5,334 ha, 1.1 %); Morrumbala (2,634 ha, 0.3 %).
- What was the weather like?
- During the fire the temperature reached 34.7 °C, humidity dropped to 19 % and gusts hit 45 km/h. The fire danger index (FWI) reached 40, class Very high.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Mozambique (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 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). 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.