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UA · Ukraine ·

Oleshky fire, 1 September 2023 Олешківський район · Oleshky

Out · last measured on 1 Sept 2023

The fire started on 1 September 2023 in Oleshky, Ukraine, and satellites saw it burning for 1 day. Copernicus mapped a burnt perimeter of 186 hectares from satellite imagery, spread across a single municipality.

It is the 638th largest in Kherson Oblast since 2016 (of 1102 with a page). Number 252 in Ukraine in 2023, of 491.

Compare with…

Suggestions: Novovorontsovka · 2024Oleshky · 2026Beryslav · 2025Beryslav · 2023

We have the Copernicus perimeter for this fire, but the VIIRS sensors did not capture it in enough detail: no day-by-day evolution, but the split by municipality is there.

Burnt area
186ha
Copernicus perimeter
Duration
1day
1 Sept 2023 – 1 Sept 2023
Municipalities hit
1
districts
Started on
1 Sept
2023
Danger at start
20
Moderate · FWI index

Where it burned

The weather it burned in

31°high
30km/h · peak gust
40%lowest humidity

It had gone 20 days without rain (1 mm or more) when it started.

This area had burned before

1% of the perimeter overlaps earlier fires recorded since 2016: 1 ha in 2022.

What happened to each town

  1. Oleshky Олешківський район 70,367 inhabitants · 32.8 km from the centre where it started
    186 ha
    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 land44 %
  • Artificial surfaces29 %
  • Agricultural areas23 %
  • Mixed forest4.3 %

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

People and buildings inside the perimeter

GHSL 2025
Built-up area3.2 ha
Residents≈ 30

Inside the perimeter there were about 3.2 hectares of built-up land and about 30 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)
1 Sept 30.8 °C 40 % 30 km/h 1.2 mm Moderate 20
2 Sept after 28.8 °C 33 % 33 km/h 0.0 mm High 27
3 Sept after 28.0 °C 30 % 37 km/h 0.0 mm High 29
4 Sept after 28.9 °C 34 % 40 km/h 0.0 mm High 32
5 Sept after 28.2 °C 33 % 48 km/h 0.0 mm High 35
6 Sept after 28.9 °C 35 % 33 km/h 0.0 mm High 29
7 Sept after 28.0 °C 31 % 38 km/h 0.0 mm High 32
8 Sept after 24.7 °C 24 % 33 km/h 0.0 mm High 34
9 Sept after 25.0 °C 28 % 45 km/h 0.0 mm High 38
10 Sept after 21.8 °C 32 % 31 km/h 0.0 mm High 29
11 Sept after 24.3 °C 35 % 25 km/h 0.0 mm High 26

Its twins: fires that started in the same weather

It started with an FWI of 20.0, a minimum humidity of 40% and 20 days without rain. Fires in the area that started in weather like this since 2022: 22.

FWI at the start 20.0
Minimum humidity 40 %
Days without rain 20
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Novovorontsovka fire, July 2024
1,184 ha 15 days FWI 18.1 Min. humidity 39 % 61 km away, in 2024

First rain (1 mm or more) after it ended: 5.7 mm on 22 Jul.

See its page Compare with this fire

What happened to them

3 days
median duration
196 ha
median area
5 %
went past 1,000 ha
3.5 mm
rain at the end (median; 17 of 22 had it)

It burned an area similar to its twins (186 ha against a median of 196 ha) and lasted 1 day, against 3 days.

In 5 of 22, 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 3.5 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
30km/h · max. gust

It was considered over on 1 Sept, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 17 of 22, with a median of 3.5 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 2022.
  • 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 · 25 Aug 2023
After · 8 Sept 2023

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 1 September 2023 the air beside the fire reached 25 µg/m³ of PM2.5. That day averaged 16: 1.0 times the WHO daily guideline (15).

PM2.5 peak25 µg/m³
Days over the guideline1 day
PM1018 µg/m³
Optical depth0.64
30 Aug1 Sept3 Sept
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)

Other fires nearby

All fires in Ukraine

Frequently asked questions

How long did the Oleshky fire last?
Copernicus dates it between 1 September 2023 and 1 September 2023: 1 day between the first and last image with fire.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 186 hectares (1.9 km²). Official national figures may differ.
Which municipalities burned?
The fire only entered Oleshky (186 ha, 0.1 %).
Did the fire reach a town?
The fire started in Oleshky and came within 32.8 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 30.8 °C, humidity dropped to 40 % and gusts hit 30 km/h. The fire danger index (FWI) reached 20, 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 2022 with a similar FWI, humidity and dry spell: 22. Their median duration was 3 days and their median area 196 ha; 5 % went past 1,000 ha. In 5 of 22, 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 3.5 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 · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
  1. Start date: 28 August 2023 → 1 September 2023.

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. No 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 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.