How long did the Derre fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 21 August 2026 to 6 September 2026 (17 days). The perimeter dates it from 28 August 2026 to 6 September 2026.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,619 hectares (36.2 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Derre (3,638 ha, 0.8 %).

What was the weather like?

During the fire the temperature reached 35.2 °C, humidity dropped to 19 % and gusts hit 45 km/h. The fire danger index (FWI) reached 41, 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.

MZ · Mozambique · 2026-08-21 → 2026-09-06

Derre fire, 21 August 2026 Derre

Out · last detection 6 Sept 2026, 11:13 UTC

The fire started on 21 August 2026 in Derre, Mozambique, and satellites saw it burning for 17 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,619 hectares from heat detections, spread across a single municipality.

It is the 609th largest in Zambézia since 2016 (of 842 with a page). Number 379 in Mozambique in 2026, of 532.

The power measured by the satellite is low (22.2 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Burnt area: 3,619ha; GWIS perimeter (Copernicus)
Duration: 17days; 21 Aug 2026 – 6 Sept 2026
Municipalities hit: 1; districts
Started on: 21 Aug; 2026
Heat detections: 86; in a single hotspot: 22 MW
Danger at start: 24; High · FWI index
Average daily power: 45MW; detected power per day, on average

Play back 6 Sept 2026

HOTSPOTS BY DAY 21 Aug6 Sept

How it evolved, day by day

21 Aug 24 Aug 28 Aug 31 Aug 1 Sept 2 Sept 4 Sept 6 Sept

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

35°high

45km/h · peak gust

19%lowest humidity

It had gone one day 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

68% of the perimeter overlaps earlier fires recorded since 2016: 143 ha in 2016, 205 ha in 2017, 275 ha in 2019, 245 ha in 2020, 243 ha in 2022, 1,284 ha in 2023, 709 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 2,448 ha that had burned before.

What happened to each town

Derre where it started

3,638 ha reached on 21 Aug

0.8 %

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)
21 Aug	31.6 °C	36 %	33 km/h	0.0 mm	High 24
22 Aug	32.1 °C	27 %	34 km/h	0.0 mm	High 30
23 Aug	33.3 °C	19 %	37 km/h	0.0 mm	Very high 40
24 Aug	28.0 °C	41 %	36 km/h	0.5 mm	High 29
25 Aug	28.6 °C	39 %	26 km/h	0.2 mm	High 27
26 Aug	30.2 °C	38 %	38 km/h	0.0 mm	High 32
27 Aug	26.8 °C	43 %	40 km/h	0.3 mm	High 29
28 Aug	26.4 °C	50 %	32 km/h	3.1 mm	Low 7
29 Aug	27.3 °C	47 %	29 km/h	0.0 mm	Moderate 13
30 Aug	32.0 °C	32 %	32 km/h	0.0 mm	High 26
31 Aug	33.7 °C	23 %	37 km/h	0.0 mm	High 37
1 Sept	32.3 °C	28 %	38 km/h	0.0 mm	High 37
2 Sept	32.5 °C	26 %	38 km/h	0.0 mm	High 37
3 Sept	33.5 °C	25 %	34 km/h	0.0 mm	High 34
4 Sept	35.2 °C	22 %	42 km/h	0.0 mm	Very high 41
5 Sept	33.2 °C	33 %	45 km/h	0.0 mm	Very high 41
6 Sept	31.3 °C	37 %	40 km/h	0.0 mm	High 34
7 Sept after	29.5 °C	38 %	45 km/h	0.1 mm	High 34
8 Sept after	23.7 °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.

↔

Before · 14 Aug 2026

After · 13 Sept 2026

Before After

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 · Copernicus

On 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).

PM2.5 peak108 µg/m³

Days over the guideline16 days

PM10112 µg/m³

Optical depth1.85

WHO 15

19202122232425262728293031123456789

Good Fair Moderate Poor Very poor Extremely poor

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 · 86Every satellite heat detection, one by one, with time, satellite, power and coordinates.

⬇ Download CSV Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.

Date and time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in Mozambique ›

Frequently asked questions

How long did the Derre fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 21 August 2026 to 6 September 2026 (17 days). The perimeter dates it from 28 August 2026 to 6 September 2026.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,619 hectares (36.2 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Derre (3,638 ha, 0.8 %).
What was the weather like?: During the fire the temperature reached 35.2 °C, humidity dropped to 19 % and gusts hit 45 km/h. The fire danger index (FWI) reached 41, 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

NASA FIRMS ↗
GWIS · Copernicus ↗

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.

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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.

Where it burned