Reni fire, 7 September 2025 Ренійський район · Reni
The fire started on 7 September 2025 in Reni, Ukraine, and satellites saw it burning for 4 days. Copernicus mapped a burnt perimeter of 371 hectares from satellite imagery, spread across a single municipality.
It is the 17th largest in Odessa Oblast since 2016 (of 82 with a page). Number 291 in Ukraine in 2025, of 1359.
- Burnt area
- 371ha
- Copernicus perimeter
- Duration
- 4days
- 7 Sept 2025 – 10 Sept 2025
- Municipalities hit
- 1
- districts
- Started on
- 7 Sept
- 2025
- Heat detections
- 29
- in a single hotspot: 74 MW
- Danger at start
- 36
- High · FWI index
- Energy released
- 564MW
- sum of detected power
Where it burned
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
It had gone 6 days without rain (1 mm or more) when it started. Rain came after the fire: 23.2 mm on 12 Sept.
This area had burned before
80% of the perimeter overlaps earlier fires recorded since 2016: 297 ha in 2022.
What happened to each town
-
370 ha reached on 6 Sept0.4 %
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
- Other natural land98 %
- Agricultural areas1.4 %
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) |
|---|---|---|---|---|---|
| 7 Sept | 27.9 °C | 31 % | 34 km/h | 0.0 mm | High 36 |
| 8 Sept | 28.7 °C | 32 % | 32 km/h | 0.0 mm | High 34 |
| 9 Sept | 28.9 °C | 31 % | 18 km/h | 0.0 mm | High 30 |
| 10 Sept | 26.5 °C | 44 % | 35 km/h | 0.5 mm | High 30 |
| 11 Sept after | 24.9 °C | 60 % | 34 km/h | 0.4 mm | High 23 |
| 12 Sept after | 21.4 °C | 86 % | 32 km/h | 23.2 mm | Very low 0 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · CopernicusOn 9 September 2025 the air beside the fire reached 20 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).
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 · 29Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 956 haReni Ренійський район24 October 2022 · 4 days · 2 km away
- 452 haReni Ренійський районAugust 2022 · 2 days · 4 km away
- 385 haSOMOVAFebruary 2022 · 1 day · 17 km away
- 604 haSOMOVA26 March 2022 · 2 days · 19 km away
- 541 haTULCEAJuly 2025 · 1 day · 28 km away
- 449 haIzmali Ізмаїльський районApril 2022 · 1 day · 30 km away
Frequently asked questions
- How long did the Reni fire last?
- Copernicus dates it between 7 September 2025 and 10 September 2025: 4 days between the first and last image with fire.
- How much area did it burn?
- The perimeter Copernicus measured from satellite imagery is 371 hectares (3.7 km²). Official national figures may differ.
- Which municipalities burned?
- The fire only entered Reni (370 ha, 0.4 %).
- Did the fire reach a town?
- The closest fire to a town centre came within 9.7 km of Reni. 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 28.9 °C, humidity dropped to 31 % and gusts hit 35 km/h. The fire danger index (FWI) reached 36, 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
Satellite cross-check
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
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.