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Kupiansk fire, 28 August 2025 Куп'янський район · Kupiansk

Out · last detection 28 Aug 2025, 11:32 UTC

The fire started on 28 August 2025 in Kupiansk, Ukraine, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 125 hectares from satellite imagery, spread across a single municipality.

It is the 399th largest in Kharkiv Oblast since 2016 (of 558 with a page). Number 1060 in Ukraine in 2025, of 1358.

Compare with…

Suggestions: Blyzniuky · 2022Troitske · 2025Dvorichna · 2024Dvorichna · 2024

Burnt area
125ha
Copernicus perimeter
Duration
1day
28 Aug 2025 – 28 Aug 2025
Municipalities hit
1
districts
Started on
28 Aug
2025
Heat detections
3
in a single hotspot: 32 MW
Danger at start
18
Moderate · FWI index
Average daily power
43MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 28 Aug28 Aug

How it evolved, day by day

28 Aug 2025 · 43 MW · 3

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

The weather it burned in

26°high
23km/h · peak gust
33%lowest humidity

It had gone 2 days without rain (1 mm or more) when it started.

This area had burned before

19% of the perimeter overlaps earlier fires recorded since 2016: 24 ha in 2024.

What happened to each town

  1. Kupiansk Куп'янський район 137,200 inhabitants · 20.5 km from the centre where it started
    125 ha reached on 28 Aug
    0.1 %

Burnt area inside each municipality, from crossing the official 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.

What burned

  • Other natural land62 %
  • Agricultural areas38 %
  • Mixed forest0.8 %

Land cover inside the perimeter as reported by Copernicus EFFIS (outside the Corine Land Cover area).

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)
28 Aug 25.6 °C 33 % 23 km/h 0.0 mm Moderate 18
29 Aug after 29.4 °C 23 % 19 km/h 0.0 mm High 24
30 Aug after 31.6 °C 16 % 37 km/h 0.0 mm Extreme 50
31 Aug after 32.8 °C 19 % 35 km/h 0.0 mm Extreme 51
1 Sept after 34.0 °C 26 % 25 km/h 0.0 mm Very high 40
2 Sept after 27.8 °C 42 % 32 km/h 0.7 mm High 27
3 Sept after 23.8 °C 45 % 33 km/h 0.0 mm High 30
4 Sept after 20.5 °C 47 % 29 km/h 0.0 mm High 26
5 Sept after 20.8 °C 47 % 32 km/h 0.0 mm High 28
6 Sept after 24.2 °C 35 % 33 km/h 0.0 mm High 29
7 Sept after 25.6 °C 39 % 41 km/h 0.0 mm High 36

Its twins: fires that started in the same weather

It started with an FWI of 18.0, a minimum humidity of 33% and 2 days without rain. Fires in the area that started in weather like this since 2020: 41.

FWI at the start 18.0
Minimum humidity 33 %
Days without rain 2
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Blyzniuky fire, March 2022
247 ha 1 day FWI 18.9 Min. humidity 33 % 158 km away, in 2022

First rain (1 mm or more) after it ended: 4.5 mm on 2 Apr.

See its page Compare with this fire

What happened to them

1 day
median duration
176 ha
median area
0 %
went past 1,000 ha
3.0 mm
rain at the end (median; 37 of 41 had it)

It burned an area similar to its twins (125 ha against a median of 176 ha) and lasted 1 day, against 1 day.

In 4 of 41, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 3.0 mm.

This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it

How it ended

—first rain
—no rain in ten days
23km/h · max. gust

It was considered over on 28 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 37 of 41, with a median of 3.0 mm.

Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

How a twin is chosen

  • Same area: fires that have already ended, less than 250 km from this one, since 2020.
  • Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
  • Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
  • Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
  • They are sorted by similarity, and the outlines of the first five are drawn.

How we calculate it

Before and after, from space

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

Before · 21 Aug 2025
After · 4 Sept 2025

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 29 August 2025 the air beside the fire reached 13 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak13 µg/m³
Days over the guideline0 days
PM1025 µg/m³
Optical depth0.30
26 Aug28 Aug30 Aug
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 · 3Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Ukraine

Frequently asked questions

How long did the Kupiansk fire last?
Copernicus dates it between 28 August 2025 and 28 August 2025: 1 day between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 125 hectares (1.2 km²). Official national figures may differ.
Which municipalities burned?
The fire only entered Kupiansk (125 ha, 0.1 %).
Did the fire reach a town?
The fire started in Kupiansk and came within 20.5 km of its centre. That is the distance from the perimeter, or the nearest hotspot, to the point marking the centre; it does not mean it entered the houses.
What was the weather like?
During the fire the temperature reached 25.6 °C, humidity dropped to 33 % and gusts hit 23 km/h. The fire danger index (FWI) reached 18, class Moderate.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Ukraine (geoBoundaries). It is not an official report.
How did the fires that started in similar weather in this area end?
Fires less than 250 km away that started since 2020 with a similar FWI, humidity and dry spell: 41. Their median duration was 1 day and their median area 176 ha; 0 % went past 1,000 ha. In 4 of 41, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 3.0 mm.

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: 101 · 112 · Emergency number and official warnings

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.

RSS Changes to this page With cross-checks and a citable version

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
What do you think is wrong?

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 101 · 112.

How we know this
  • Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
  • Dates from the perimeter: the VIIRS detections inside it did not change them. 3 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.

How we build fire pages: methodology

Where this data comes from

The perimeter and land cover come from the Copernicus European Forest Fire Information System (EFFIS), measured on MODIS and Sentinel-2 imagery and published under CC BY 4.0. 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 slightly from each country’s official figure.