How long did the Mirninsky Ulus fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 29 July 2026 to 2 September 2026 (36 days). The perimeter dates it from 29 July 2026 to 26 August 2026.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 21,204 hectares (212.0 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Mirninsky Ulus (22,577 ha, 0.1 %).

What was the weather like?

During the fire the temperature reached 31.1 °C, humidity dropped to 23 % and gusts hit 46 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 · 2026-07-29 → 2026-09-02

Mirninsky Ulus fire, 29 July 2026 Mirninsky Ulus

Out · last detection 2 Sept 2026, 19:49 UTC

The fire started on 29 July 2026 in Mirninsky Ulus, Russia, and satellites saw it burning for 36 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 21,204 hectares from heat detections, spread across a single municipality.

It is the 258th largest in Sakha Republic since 2016 (of 1422 with a page). Number 54 in Russia in 2026, of 419.

Burnt area: 21,204ha; GWIS perimeter (Copernicus)
Duration: 36days; 29 Jul 2026 – 2 Sept 2026
Municipalities hit: 1; districts
Started on: 29 Jul; 2026
Heat detections: 2,279; in a single hotspot: 524 MW
Danger at start: 20; Moderate · FWI index
Energy released: 37.3GW; sum of detected power

Play back 2 Sept 2026

HOTSPOTS BY DAY 29 Jul2 Sept

How it evolved, day by day

2930311245678910111213141516192021222324252627283012

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

The weather it burned in

31°high

46km/h · peak gust

23%lowest humidity

It had gone 8 days without rain (1 mm or more) when it started. Rain came after the fire: 1.0 mm on 29 Aug.

This area had burned before

3% of the perimeter overlaps earlier fires recorded since 2016: 567 ha in 2020.

567 ha Mirninsky Ulus fire, June 2020 46,446 ha in total; the hectares shown are those it shares with this fire

What happened to each town

Mirninsky Ulus where it started

22,577 ha reached on 29 Jul

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)
29 Jul	30.6 °C	24 %	21 km/h	0.0 mm	Moderate 20
30 Jul	30.6 °C	23 %	28 km/h	0.0 mm	High 23
31 Jul	30.6 °C	26 %	20 km/h	0.0 mm	High 21
1 Aug	31.1 °C	25 %	26 km/h	0.0 mm	High 24
2 Aug	28.4 °C	29 %	46 km/h	3.5 mm	Moderate 11
3 Aug	14.1 °C	46 %	43 km/h	0.0 mm	Moderate 13
4 Aug	14.7 °C	37 %	29 km/h	0.0 mm	Moderate 13
5 Aug	21.0 °C	30 %	25 km/h	0.0 mm	Moderate 16
6 Aug	23.4 °C	27 %	44 km/h	0.0 mm	High 24
7 Aug	21.6 °C	37 %	45 km/h	0.6 mm	Moderate 20
8 Aug	22.8 °C	45 %	27 km/h	0.0 mm	Moderate 16
9 Aug	17.8 °C	41 %	37 km/h	0.1 mm	Moderate 19
10 Aug	17.5 °C	40 %	26 km/h	0.0 mm	Moderate 17
11 Aug	17.4 °C	36 %	27 km/h	0.0 mm	Moderate 18
12 Aug	18.0 °C	35 %	10 km/h	0.0 mm	Moderate 14
13 Aug	16.1 °C	46 %	30 km/h	0.8 mm	Moderate 12
14 Aug	14.0 °C	54 %	28 km/h	0.1 mm	Moderate 12
15 Aug	13.1 °C	53 %	30 km/h	0.0 mm	Moderate 12
16 Aug	18.2 °C	50 %	41 km/h	0.2 mm	Moderate 15
17 Aug	18.4 °C	53 %	41 km/h	1.7 mm	Low 7
18 Aug	16.0 °C	51 %	27 km/h	0.0 mm	Low 9
19 Aug	15.6 °C	42 %	21 km/h	0.0 mm	Moderate 11
20 Aug	18.0 °C	32 %	10 km/h	0.0 mm	Moderate 13
21 Aug	19.5 °C	31 %	12 km/h	0.0 mm	Moderate 16
22 Aug	19.1 °C	36 %	16 km/h	0.0 mm	Moderate 16
23 Aug	19.5 °C	32 %	11 km/h	0.0 mm	Moderate 16
24 Aug	21.5 °C	30 %	24 km/h	0.0 mm	Moderate 21
25 Aug	20.4 °C	36 %	21 km/h	0.0 mm	Moderate 20
26 Aug	21.1 °C	30 %	32 km/h	0.0 mm	High 24
27 Aug	20.5 °C	30 %	26 km/h	0.0 mm	High 23
28 Aug	20.3 °C	33 %	18 km/h	0.0 mm	Moderate 21
29 Aug	18.9 °C	48 %	32 km/h	1.0 mm	Moderate 12

Before and after, from space

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

↔

Before · 22 Jul 2026

After · 9 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 28 August 2026 the air beside the fire reached 3,107 µg/m³ of PM2.5. That day averaged 1,967: 131 times the WHO daily guideline (15).

PM2.5 peak3,107 µg/m³

Days over the guideline30 days

PM103,137 µg/m³

Optical depth5.80

WHO 15

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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 · 2,279Every 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?: According to the heat detections seen by satellite inside the perimeter, it burned from 29 July 2026 to 2 September 2026 (36 days). The perimeter dates it from 29 July 2026 to 26 August 2026.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 21,204 hectares (212.0 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Mirninsky Ulus (22,577 ha, 0.1 %).
What was the weather like?: During the fire the temperature reached 31.1 °C, humidity dropped to 23 % and gusts hit 46 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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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 112.

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