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S fire, August 2026 S, skB, Hajmisknr

Out · last detection 12 Aug 2026, 12:38 UTC

The fire started on 12 August 2026 in S, Hungary, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 319 hectares from satellite imagery, spread across 4 municipalities.

Number 2 in Hungary in 2026, of 6.

Compare with…

Suggestions: Egyek · 2026Tiszafnred · 2022Hajmisknr · 2021Hajmisknr · 2020

Burnt area
319ha
Copernicus perimeter
Duration
≈ 1day
12 Aug 2026 – 12 Aug 2026
Municipalities hit
4
municipalities
Started on
12 Aug
2026
Heat detections
19
in a single hotspot: 46 MW
Danger at start
38
High · FWI index
Average daily power
282MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 12 Aug12 Aug

How it evolved, day by day

12 Aug 2026 · 282 MW · 19

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

The weather it burned in

29°high
31km/h · peak gust
20%lowest humidity

It had gone 19 days without rain (1 mm or more) when it started. Rain came after the fire: 5.5 mm on 17 Aug.

This area had burned before

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

What happened to each town

  1. S where it started
    154 ha reached on 12 Aug
    15 %
  2. skB
    110 ha reached on 12 Aug
    2.3 %
  3. Hajmisknr
    40 ha reached on 12 Aug
    1.0 %
  4. Vilonya
    15 ha reached on 12 Aug
    1.1 %

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 land53 %
  • Agricultural areas35 %
  • Scrub and transitional woodland6.3 %
  • Broadleaved forest4.8 %

Natura 2000 protected area affected: 60 %

Natura 2000 sites (European Environment Agency, 2024 release) crossed by the perimeter.

Land cover inside the perimeter according to Corine Land Cover, as reported by Copernicus.

People and buildings inside the perimeter

GHSL 2025
Built-up area0.98 ha
Residents≈ 40

Inside the perimeter there were about 0.98 hectares of built-up land and about 40 residents (GHSL 2025, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

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)
12 Aug 28.9 °C 20 % 31 km/h 0.0 mm High 38
13 Aug after 28.8 °C 25 % 23 km/h 0.0 mm High 34
14 Aug after 30.5 °C 20 % 21 km/h 0.0 mm High 35
15 Aug after 32.6 °C 22 % 26 km/h 0.0 mm High 36
16 Aug after 33.8 °C 21 % 37 km/h 0.0 mm Very high 44
17 Aug after 27.5 °C 45 % 38 km/h 5.5 mm Low 9

Its twins: fires that started in the same weather

It started with an FWI of 37.7, a minimum humidity of 20% and 19 days without rain. Fires in the area that started in weather like this since 2017: 8.

FWI at the start 37.7
Minimum humidity 20 %
Days without rain 19
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Egyek fire, September 2026
100 ha 1 day FWI 38.6 Min. humidity 19 % 228 km away, in 2026

First rain (1 mm or more) after it ended: 11.5 mm on 11 Sept.

See its page Compare with this fire

What happened to them

Fires in the area that started in similar weather: 8. With fewer than 15 we give no figures: they would be more noise than signal.

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

5.5 mmfirst rain
17 Aug5 days after it ended
31km/h · max. gust

It was considered over on 12 Aug, and on 17 Aug 5.5 mm fell. We do not know whether the rain or the firefighters put it out.

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 2017.
  • 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 · 5 Aug 2026
After · 19 Aug 2026

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 15 August 2026 the air beside the fire reached 12 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak12 µg/m³
Days over the guideline0 days
PM1021 µg/m³
Optical depth0.27
10 Aug12 Aug14 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 · 19Every 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 Hungary

Frequently asked questions

How long did the S fire last?
The official perimeter only gives the start date (12 August 2026). The end comes from the heat detections inside the perimeter: it burned until 12 August 2026 (1 day from 12 August 2026), the last day with detections before more than 10 days in a row without any, so it is approximate.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 319 hectares (3.2 km²). Official national figures may differ.
Which municipalities burned?
The fire entered 4 municipalities: S (154 ha, 15 %); skB (110 ha, 2.3 %); Hajmisknr (40 ha, 1.0 %); Vilonya (15 ha, 1.1 %).
What was the weather like?
During the fire the temperature reached 28.9 °C, humidity dropped to 20 % and gusts hit 31 km/h. The fire danger index (FWI) reached 38, class High.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Hungary (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 · 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 112.

How we know this
  • Perimeter: EFFIS (Copernicus), mapped on satellite imagery.
  • The official perimeter has no end date: the end is the last day with VIIRS detections inside the perimeter before a gap of more than 10 days (150 days at most), so it is approximate. 19 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.
  • Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

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 ADM3 (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 slightly from each country’s official figure.