How long did the Acharnes fire last?

Copernicus dates it between 26 July 2025 and 27 July 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 275 hectares (2.8 km²). Official national figures may differ.

Which municipalities burned?

The fire entered 3 municipalities: Oropos (161 ha, 0.5 %); Acharnes (110 ha, 0.7 %); Dionysos (4 ha, 0.1 %).

Did the fire reach a town?

The closest fire to a town centre came within 16.3 km of Oropos. That is the distance to the perimeter or nearest hotspot; it does not mean it entered the houses.

What was the weather like?

During the fire the temperature reached 35.7 °C, humidity dropped to 20 % and gusts hit 55 km/h. The fire danger index (FWI) reached 50, class Extreme.

Where does this data come from?

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

EL · Greece · 2025-07-26 → 2025-07-27

Acharnes fire, July 2025 Δημοτική Ενότητα ΑΧΑΡΝΩΝ · Oropos, Acharnes, Dionysos

Out · last detection 27 Jul 2025, 00:08 UTC

The fire started on 26 July 2025 in Acharnes, Greece, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 275 hectares from satellite imagery, spread across 3 municipalities.

It is the 23th largest in Attica since 2016 (of 33 with a page). Number 24 in Greece in 2025, of 43.

The power measured by the satellite is low (2.0 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Burnt area: 275ha; Copernicus perimeter
Duration: 2days; 26 Jul 2025 – 27 Jul 2025
Municipalities hit: 3; municipalities
Started on: 26 Jul; 2025
Heat detections: 1; in a single hotspot: 2 MW
Danger at start: 50; Extreme · FWI index
Energy released: 2MW; sum of detected power

HOTSPOTS BY DAY 26 Jul27 Jul

How it evolved, day by day

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

The weather it burned in

36°high

55km/h · peak gust

20%lowest humidity

It had gone 34 days without rain (1 mm or more) when it started. Rain came after the fire: 1.9 mm on 31 Jul.

This area had burned before

94% of the perimeter overlaps earlier fires recorded since 2016: 259 ha in 2021, 13 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 259 ha that had burned before.

259 ha Varympompi fire, August 2021 8,454 ha in total; the hectares shown are those it shares with this fire

What happened to each town

Oropos δημοτική ενότητα Ωρωπίων 8,447 inhabitants · 16.3 km from the town

161 ha

0.5 %
Acharnes Δημοτική Ενότητα ΑΧΑΡΝΩΝ 76,826 inhabitants where it started

110 ha reached on 27 Jul

0.7 %
Dionysos Διονύσου

4 ha

0.1 %

Burnt area inside each municipality, from crossing the official 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.

What burned

Scrub and transitional woodland52 %
Agricultural areas31 %
Mixed forest15 %
Artificial surfaces2.9 %

Natura 2000 protected area affected: 7 %

ZEPA + LIC OROS PARNITHA GR3000001

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.

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)
26 Jul	35.7 °C	20 %	55 km/h	0.0 mm	Extreme 50
27 Jul	35.2 °C	27 %	32 km/h	0.0 mm	Very high 40
28 Jul after	35.1 °C	22 %	36 km/h	0.0 mm	Very high 40
29 Jul after	34.2 °C	26 %	41 km/h	0.0 mm	Very high 39
30 Jul after	31.1 °C	42 %	30 km/h	0.2 mm	High 32
31 Jul after	30.1 °C	51 %	36 km/h	1.9 mm	Moderate 12

Before and after, from space

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

↔

Before · 19 Jul 2025

After · 3 Aug 2025

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 24 July 2025 the air beside the fire reached 18 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak18 µg/m³

Days over the guideline0 days

PM1041 µg/m³

Optical depth0.29

WHO 15

24252627282930

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 time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in Greece ›

Frequently asked questions

How long did the Acharnes fire last?: Copernicus dates it between 26 July 2025 and 27 July 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 275 hectares (2.8 km²). Official national figures may differ.
Which municipalities burned?: The fire entered 3 municipalities: Oropos (161 ha, 0.5 %); Acharnes (110 ha, 0.7 %); Dionysos (4 ha, 0.1 %).
Did the fire reach a town?: The closest fire to a town centre came within 16.3 km of Oropos. That is the distance to the perimeter or nearest hotspot; it does not mean it entered the houses.
What was the weather like?: During the fire the temperature reached 35.7 °C, humidity dropped to 20 % and gusts hit 55 km/h. The fire danger index (FWI) reached 50, class Extreme.
Where does this data come from?: From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Greece (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 · 199

Satellite cross-check

NASA FIRMS ↗
EFFIS · 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.

Report an error

What do you think is wrong?

Dates or duration Place or towns Burned area Name It was not a wildfire Same fire as another page Something else

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 · 199.

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 (CC0 1.0 Universal (CC0 1.0) Public Domain Dedication). 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.

Where it burned