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Sloviansk fire, 10 September 2025 Слов'янський район · Sloviansk, Barvinkove

Out · last detection 11 Sept 2025, 10:29 UTC

The fire started on 10 September 2025 in Sloviansk, Ukraine, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 167 hectares from satellite imagery, spread across 2 municipalities.

It is the 538th largest in Donetsk Oblast since 2016 (of 1004 with a page). Number 778 in Ukraine in 2025, of 1359.

The power measured by the satellite is low (1.0 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Compare with…

Suggestions: Barvinkove · 2024Sloviansk · 2024Sloviansk · 2024Lyman · 2024

Burnt area
167ha
Copernicus perimeter
Duration
2days
10 Sept 2025 – 11 Sept 2025
Municipalities hit
2
districts
Started on
10 Sept
2025
Heat detections
1
in a single hotspot: 1 MW
Danger at start
33
High · FWI index
Average daily power
1MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 10 Sept11 Sept

How it evolved, day by day

11 Sept 2025 · 1 MW · 1

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

The weather it burned in

25°high
50km/h · peak gust
24%lowest humidity

It had gone 15 days without rain (1 mm or more) when it started. Rain came after the fire: 3.2 mm on 18 Sept.

This area had burned before

47% of the perimeter overlaps earlier fires recorded since 2016: 78 ha in 2024.

What happened to each town

  1. Sloviansk Слов'янський район 37.9 km from the centre where it started
    130 ha
    0.1 %
  2. Barvinkove Барвінківський район 20,290 inhabitants · 34.2 km from the centre
    37 ha reached on 11 Sept
    0.0 %

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

  • Agricultural areas49 %
  • Other natural land24 %
  • Mixed forest22 %
  • Broadleaved forest4.8 %

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)
10 Sept 25.1 °C 31 % 50 km/h 0.0 mm High 33
11 Sept 23.6 °C 24 % 41 km/h 0.0 mm High 31
12 Sept after 25.0 °C 28 % 32 km/h 0.0 mm High 29
13 Sept after 21.2 °C 28 % 40 km/h 0.0 mm High 31
14 Sept after 24.7 °C 28 % 38 km/h 0.0 mm High 31
15 Sept after 25.2 °C 25 % 42 km/h 0.0 mm High 33
16 Sept after 24.0 °C 21 % 36 km/h 0.0 mm High 33
17 Sept after 24.8 °C 22 % 45 km/h 0.0 mm High 38
18 Sept after 19.4 °C 36 % 32 km/h 3.2 mm Low 7

Before and after, from space

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

Before · 3 Sept 2025
After · 18 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 9 September 2025 the air beside the fire reached 10 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak10 µg/m³
Days over the guideline0 days
PM1011 µg/m³
Optical depth0.50
891011121314
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 · 1Every 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 Sloviansk fire last?
Copernicus dates it between 10 September 2025 and 11 September 2025: 2 days between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 167 hectares (1.7 km²). Official national figures may differ.
Which municipalities burned?
The fire entered 2 municipalities: Sloviansk (130 ha, 0.1 %); Barvinkove (37 ha, 0.0 %).
Did the fire reach a town?
The fire came within 34.2 km of the centre of Barvinkove, the closest of the areas it touched. 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 25.1 °C, humidity dropped to 24 % and gusts hit 50 km/h. The fire danger index (FWI) reached 33, class High.
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.

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

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. One Suomi-NPP VIIRS detection 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.