How long did the Mirninsky Ulus fire last?

GWIS (Copernicus) dates it between 1 August 2026 and 1 September 2026: 32 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 12,878 hectares (128.8 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Mirninsky Ulus (12,651 ha, 0.1 %).

What was the weather like?

During the fire the temperature reached 30.5 °C, humidity dropped to 28 % and gusts hit 41 km/h. The fire danger index (FWI) reached 24, class High.

Where does this data come from?

From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Russia (geoBoundaries). It is not an official report.

RU · Russia · 2026-08-01 → 2026-09-01

Mirninsky Ulus fire, 1 August 2026 Mirninsky Ulus

Out · last detection 1 Sept 2026, 20:10 UTC

The fire started on 1 August 2026 in Mirninsky Ulus, Russia, and satellites saw it burning for 32 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 12,878 hectares from heat detections, spread across a single municipality.

It is the 404th largest in Sakha Republic since 2016 (of 1422 with a page). Number 91 in Russia in 2026, of 419.

Burnt area: 12,878ha; GWIS perimeter (Copernicus)
Duration: 32days; 1 Aug 2026 – 1 Sept 2026
Municipalities hit: 1; districts
Started on: 1 Aug; 2026
Heat detections: 2,653; in a single hotspot: 222 MW
Danger at start: 20; Moderate · FWI index
Energy released: 16.0GW; sum of detected power

Play back 1 Sept 2026

HOTSPOTS BY DAY 1 Aug1 Sept

How it evolved, day by day

1245678911121314151617192021222324252627282930311

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

The weather it burned in

30°high

41km/h · peak gust

28%lowest humidity

It had gone 13 days without rain (1 mm or more) when it started. Rain came after the fire: 4.6 mm on 2 Sept.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

What happened to each town

Mirninsky Ulus where it started

12,651 ha reached on 1 Aug

0.1 %

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)
1 Aug	30.5 °C	30 %	15 km/h	0.3 mm	Moderate 20
2 Aug	30.2 °C	28 %	30 km/h	0.0 mm	High 24
3 Aug	20.4 °C	45 %	41 km/h	0.0 mm	Moderate 20
4 Aug	16.9 °C	31 %	25 km/h	0.0 mm	Moderate 17
5 Aug	21.0 °C	33 %	19 km/h	0.0 mm	Moderate 16
6 Aug	23.1 °C	30 %	35 km/h	0.0 mm	Moderate 20
7 Aug	23.4 °C	34 %	34 km/h	0.0 mm	Moderate 20
8 Aug	24.9 °C	54 %	21 km/h	7.8 mm	Very low 1
9 Aug	21.6 °C	38 %	37 km/h	0.0 mm	Low 6
10 Aug	21.0 °C	37 %	23 km/h	0.0 mm	Low 10
11 Aug	18.6 °C	42 %	33 km/h	0.0 mm	Moderate 13
12 Aug	18.3 °C	37 %	17 km/h	0.0 mm	Moderate 11
13 Aug	17.0 °C	46 %	22 km/h	0.2 mm	Moderate 12
14 Aug	17.0 °C	43 %	31 km/h	0.1 mm	Moderate 14
15 Aug	15.5 °C	48 %	30 km/h	0.0 mm	Moderate 14
16 Aug	15.4 °C	49 %	26 km/h	0.0 mm	Moderate 13
17 Aug	19.1 °C	51 %	34 km/h	0.4 mm	Moderate 14
18 Aug	16.6 °C	51 %	31 km/h	0.1 mm	Moderate 14
19 Aug	14.6 °C	46 %	26 km/h	0.0 mm	Moderate 13
20 Aug	17.8 °C	37 %	22 km/h	0.0 mm	Moderate 14
21 Aug	20.1 °C	32 %	13 km/h	0.0 mm	Moderate 14
22 Aug	20.1 °C	35 %	22 km/h	0.0 mm	Moderate 16
23 Aug	19.3 °C	33 %	23 km/h	0.0 mm	Moderate 16
24 Aug	19.5 °C	31 %	21 km/h	0.0 mm	Moderate 17
25 Aug	21.1 °C	36 %	18 km/h	0.0 mm	Moderate 17
26 Aug	21.0 °C	42 %	21 km/h	0.0 mm	Moderate 17
27 Aug	20.8 °C	39 %	11 km/h	0.0 mm	Moderate 16
28 Aug	19.8 °C	47 %	24 km/h	0.0 mm	Moderate 17
29 Aug	22.1 °C	46 %	24 km/h	0.0 mm	Moderate 17
30 Aug	20.6 °C	46 %	35 km/h	0.2 mm	Moderate 20
31 Aug	23.5 °C	38 %	36 km/h	0.0 mm	Moderate 21
1 Sept	25.3 °C	36 %	35 km/h	0.0 mm	High 22
2 Sept after	18.8 °C	43 %	35 km/h	4.6 mm	Very low 4

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 25 Jul 2026

After · 8 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 27 August 2026 the air beside the fire reached 2,742 µg/m³ of PM2.5. That day averaged 1,545: 103 times the WHO daily guideline (15).

PM2.5 peak2,742 µg/m³

Days over the guideline36 days

PM102,764 µg/m³

Optical depth4.63

WHO 15

3031123456789101112131415161718192021222324252627282930311234

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 · 2,653Every 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 Russia ›

Frequently asked questions

How long did the Mirninsky Ulus fire last?: GWIS (Copernicus) dates it between 1 August 2026 and 1 September 2026: 32 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 12,878 hectares (128.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Mirninsky Ulus (12,651 ha, 0.1 %).
What was the weather like?: During the fire the temperature reached 30.5 °C, humidity dropped to 28 % and gusts hit 41 km/h. The fire danger index (FWI) reached 24, class High.
Where does this data come from?: From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Russia (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.

Emergency number: 112

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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What really happened?

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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 (Open Data Commons Open Database License 1.0). 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