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Santo Tirso fire, July 2026 Reguenga, Seroa, Penamaior

Out · last detection 5 Jul 2026, 03:06 UTC

The fire started on 4 July 2026 in Reguenga, Portugal, and satellites saw it burning for 2 days. Copernicus mapped a burnt perimeter of 138 hectares from satellite imagery, spread across 3 municipalities. According to ICNF, it was detected on 4 July 2026 at 15:22 and declared extinguished on 4 July 2026.

Number 71 in Portugal in 2026, of 86.

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Burnt area
138ha
Copernicus perimeter
Duration
≈ 2days
4 Jul 2026 – 5 Jul 2026
Municipalities hit
3
freguesias
Started on
4 Jul
2026
Heat detections
16
in a single hotspot: 60 MW
Average daily power
232MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 4 Jul5 Jul
5 Jul 2026

How it evolved, day by day

4 Jul 2026 · 182 MW · 4 5 Jul 2026 · 281 MW · 12
4 Jul 5 Jul

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

This area had burned before

49% of the perimeter overlaps earlier fires recorded since 2016: 64 ha in 2016, 13 ha in 2020. Part of it burned more than once, so the yearly figures add up to more than the 68 ha that had burned before.

What happened to each town

  1. Reguenga 1,427 inhabitants · 1.8 km from the centre where it started
    102 ha reached on 4 Jul
    20 %
  2. Seroa 3,757 inhabitants · 1.0 km from the centre
    32 ha reached on 4 Jul
    5.2 %
  3. Penamaior 3,586 inhabitants · 1.5 km from the centre
    4 ha reached on 4 Jul
    0.5 %

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

  • Scrub and transitional woodland87 %
  • Mixed forest12 %
  • Artificial surfaces1.5 %

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

Official record

According to ICNF, this fire started on 4 July 2026 and burned 139 ha (the satellite measured 138 ha).

ICNF (Instituto da Conservação da Natureza e das Florestas). This is the agency’s operational record: its figures may be revised when the year’s statistics are closed.

Before and after, from space

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

Before · 27 Jun 2026
After · 12 Jul 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 7 July 2026 the air beside the fire reached 132 µg/m³ of PM2.5. That day averaged 54: 3.6 times the WHO daily guideline (15).

PM2.5 peak132 µg/m³
Days over the guideline3 days
PM10205 µg/m³
Optical depth0.54
234567
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 · 16Every 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 Portugal ›

Frequently asked questions

How long did the Santo Tirso fire last?
The official perimeter only gives the start date (4 July 2026). The end comes from the heat detections inside the perimeter: it burned until 5 July 2026 (2 days from 4 July 2026), the last day with detections before more than 10 days in a row without any, so it is approximate. According to ICNF, it was detected on 4 July 2026 at 15:22 and declared extinguished on 4 July 2026.
How much area did it burn?
The perimeter Copernicus measured from satellite imagery is 138 hectares (1.4 km²). Official national figures may differ.
Which municipalities burned?
The fire entered 3 municipalities: Reguenga (102 ha, 20 %); Seroa (32 ha, 5.2 %); Penamaior (4 ha, 0.5 %).
Did the fire reach a town?
The fire came within 1.0 km of the centre of Seroa, 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.
Where does this data come from?
From the EFFIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Portugal (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

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.

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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.

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. 16 Suomi-NPP VIIRS detections on those dates.
  • Compared with ICNF: 139 official ha against 138 ha of perimeter; they agree within 25%.

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 (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.